Fix: FileSystemEntry.Attributes property is not correct on Unix #52235

carlossanlop · 2021-05-04T05:01:16Z

New attempt - this time without a perf regression. Changes in this PR:

Caching the stat and lstat results inside FileStatus.
Collection of information is the same between FileSystemEntry and FileStatus.
The Hidden and ReadOnly flags are now being collected when expected, and made sure they are collected lazily, to avoid the perf regression on enumeration when not required.
`System.IO.FileSystem unit tests passed locally, pending checking all results from CI.

cc @iSazonov @mklement0 @Jozkee @adamsitnik @jeffhandley

I collected perf results for the System.IO.Tests.Perf_Directory benchmarks four times, before and after my changes, because IO benchmarks tend to yield not-so-stable results. I wanted to make sure the results stayed under a close margin of error:

Command:

/home/carlos/.dotnet/dotnet run \
    --project /home/carlos/performance/src/benchmarks/micro/MicroBenchmarks.csproj
    -c Release -f net6.0 \
    --artifacts /home/carlos/perf_together \
    --coreRun \
        /home/carlos/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun \
        /home/carlos/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun \
    --cli /home/carlos/.dotnet/dotnet \
    --statisticalTest 3ms \
    --filter System.IO.Tests.Perf_Directory*

Result 1

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-VQFCFU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,786.0 ns	909.50 ns	1,047.38 ns	20,665.0 ns	19,000.0 ns	23,180.0 ns	1.03	Same	0.07	-	-	-	497 B
CreateDirectory	Job-YTPACX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,123.0 ns	687.54 ns	791.77 ns	19,840.0 ns	19,020.0 ns	21,580.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-ZALFUF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	615.0 ns	6.28 ns	5.87 ns	615.5 ns	598.7 ns	623.2 ns	1.01	Same	0.03	0.0442	-	-	288 B
GetCurrentDirectory	Job-KVFFMU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	606.8 ns	14.38 ns	16.56 ns	605.7 ns	557.5 ns	632.4 ns	1.00	Base	0.00	0.0440	-	-	288 B

Exists	Job-ZALFUF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	622.9 ns	10.46 ns	9.78 ns	624.7 ns	608.5 ns	637.6 ns	1.02	Same	0.02	-	-	-	-
Exists	Job-KVFFMU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	610.9 ns	4.02 ns	3.76 ns	611.2 ns	601.5 ns	616.3 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-ZALFUF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,436,529.1 ns	32,055.46 ns	29,984.70 ns	3,447,346.9 ns	3,380,712.5 ns	3,471,143.8 ns	1.02	Same	0.01	125.0000	-	-	872,324 B
EnumerateFiles	Job-KVFFMU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,361,367.6 ns	34,994.73 ns	31,021.91 ns	3,346,721.9 ns	3,328,408.8 ns	3,430,447.5 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-ZALFUF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	366,592.8 ns	4,279.96 ns	3,573.96 ns	366,223.7 ns	361,246.7 ns	372,439.2 ns	1.00	Same	0.02	1.4535	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-KVFFMU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	366,512.9 ns	6,944.90 ns	6,156.47 ns	365,293.6 ns	357,992.4 ns	378,678.6 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-ZALFUF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,011,570.2 ns	30,733.07 ns	27,244.06 ns	4,013,036.3 ns	3,969,929.0 ns	4,059,991.9 ns	1.01	Same	0.01	32.2581	16.1290	-	249,588 B
RecursiveCreateDeleteDirectory	Job-KVFFMU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,957,395.1 ns	45,248.32 ns	37,784.40 ns	3,959,139.7 ns	3,891,123.8 ns	4,021,439.7 ns	1.00	Base	0.00	31.7460	15.8730	-	237,357 B

Result 2

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-NAOXHK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	19,783.3 ns	791.01 ns	846.38 ns	19,410.0 ns	18,770.0 ns	21,480.0 ns	0.95	Same	0.11	-	-	-	497 B
CreateDirectory	Job-SUNLMH	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,055.6 ns	2,350.29 ns	2,514.79 ns	20,135.0 ns	18,760.0 ns	26,970.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-AIHZTX	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	603.1 ns	7.41 ns	6.93 ns	602.6 ns	586.8 ns	615.6 ns	1.00	Same	0.01	0.0457	-	-	288 B
GetCurrentDirectory	Job-HOTEOR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	600.8 ns	2.30 ns	2.15 ns	600.4 ns	597.4 ns	604.4 ns	1.00	Base	0.00	0.0436	-	-	288 B

Exists	Job-AIHZTX	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	614.7 ns	5.18 ns	4.60 ns	614.4 ns	609.7 ns	623.1 ns	1.01	Same	0.01	-	-	-	-
Exists	Job-HOTEOR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	611.0 ns	4.58 ns	4.06 ns	609.4 ns	604.1 ns	618.4 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-AIHZTX	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,441,360.7 ns	26,152.90 ns	23,183.86 ns	3,438,537.5 ns	3,398,874.2 ns	3,485,755.5 ns	1.03	Same	0.01	125.0000	-	-	872,323 B
EnumerateFiles	Job-HOTEOR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,332,139.2 ns	25,884.69 ns	24,212.56 ns	3,331,166.2 ns	3,300,743.8 ns	3,363,672.5 ns	1.00	Base	0.00	137.5000	-	-	872,322 B

RecursiveCreateDeleteDirectory	Job-AIHZTX	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	367,497.6 ns	4,021.55 ns	3,565.00 ns	366,880.6 ns	361,300.4 ns	374,970.8 ns	1.01	Same	0.01	1.4620	-	-	9,554 B
RecursiveCreateDeleteDirectory	Job-HOTEOR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	364,194.4 ns	4,306.78 ns	3,596.36 ns	364,351.7 ns	359,269.8 ns	369,916.0 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-AIHZTX	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,007,709.4 ns	39,706.47 ns	33,156.70 ns	4,011,190.5 ns	3,937,668.3 ns	4,054,766.7 ns	1.00	Same	0.01	31.7460	15.8730	-	249,587 B
RecursiveCreateDeleteDirectory	Job-HOTEOR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,002,334.2 ns	34,737.30 ns	30,793.71 ns	3,997,458.9 ns	3,952,767.7 ns	4,060,111.3 ns	1.00	Base	0.00	32.2581	16.1290	-	237,357 B

Result 3

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-PDEYFB	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,425.8 ns	1,504.72 ns	1,672.50 ns	19,930.0 ns	18,730.0 ns	24,170.0 ns	0.99	Same	0.10	-	-	-	497 B
CreateDirectory	Job-OWNBSX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,690.5 ns	1,000.45 ns	1,112.00 ns	20,760.0 ns	18,990.0 ns	22,770.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-MLRFUU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	609.1 ns	8.71 ns	8.15 ns	610.9 ns	593.9 ns	623.5 ns	1.00	Same	0.02	0.0452	-	-	288 B
GetCurrentDirectory	Job-ZSPQVX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	606.5 ns	7.70 ns	7.21 ns	606.4 ns	591.4 ns	616.1 ns	1.00	Base	0.00	0.0459	-	-	288 B

Exists	Job-MLRFUU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	620.7 ns	1.91 ns	1.78 ns	620.0 ns	618.4 ns	624.1 ns	1.00	Same	0.01	-	-	-	-
Exists	Job-ZSPQVX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	621.7 ns	4.35 ns	4.07 ns	623.0 ns	613.1 ns	625.9 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-MLRFUU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,492,924.1 ns	31,351.68 ns	29,326.38 ns	3,489,420.3 ns	3,446,018.8 ns	3,538,670.3 ns	1.03	Same	0.01	125.0000	-	-	872,324 B
EnumerateFiles	Job-ZSPQVX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,391,640.5 ns	33,177.29 ns	31,034.06 ns	3,391,781.2 ns	3,344,562.5 ns	3,461,081.2 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-MLRFUU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	419,711.6 ns	27,996.69 ns	32,241.03 ns	429,124.8 ns	361,567.1 ns	468,078.5 ns	1.18	Same	0.05	-	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-ZSPQVX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	366,426.2 ns	6,737.50 ns	5,260.20 ns	365,630.5 ns	360,113.6 ns	380,890.1 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-MLRFUU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,012,941.6 ns	50,257.57 ns	44,552.02 ns	4,006,118.5 ns	3,955,548.4 ns	4,093,054.8 ns	1.00	Same	0.01	32.2581	16.1290	-	249,588 B
RecursiveCreateDeleteDirectory	Job-ZSPQVX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,031,409.2 ns	39,659.96 ns	35,157.52 ns	4,019,719.4 ns	3,995,309.7 ns	4,119,485.5 ns	1.00	Base	0.00	32.2581	16.1290	-	237,348 B

Result 4

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-ODAKGD	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,361.1 ns	2,064.33 ns	2,294.49 ns	20,610.0 ns	19,150.0 ns	27,150.0 ns	1.04	Same	0.13	-	-	-	497 B
CreateDirectory	Job-OVXERW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,603.2 ns	1,332.69 ns	1,481.28 ns	20,030.0 ns	19,060.0 ns	24,150.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-FNVICF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	596.2 ns	8.61 ns	8.05 ns	597.1 ns	581.3 ns	607.6 ns	1.00	Same	0.02	0.0435	-	-	288 B
GetCurrentDirectory	Job-MXCTDU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	597.5 ns	10.43 ns	9.25 ns	597.7 ns	584.1 ns	616.2 ns	1.00	Base	0.00	0.0452	-	-	288 B

Exists	Job-FNVICF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	618.3 ns	5.64 ns	5.28 ns	617.5 ns	611.5 ns	630.4 ns	0.99	Same	0.01	-	-	-	-
Exists	Job-MXCTDU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	623.7 ns	3.24 ns	3.04 ns	624.3 ns	619.3 ns	628.6 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-FNVICF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,393,408.9 ns	32,024.75 ns	29,955.97 ns	3,396,978.8 ns	3,329,993.8 ns	3,436,910.0 ns	1.02	Same	0.01	137.5000	-	-	872,322 B
EnumerateFiles	Job-MXCTDU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,337,261.2 ns	45,611.81 ns	42,665.32 ns	3,348,791.2 ns	3,274,133.8 ns	3,411,288.8 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-FNVICF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	364,870.1 ns	4,342.78 ns	3,626.42 ns	365,444.7 ns	356,443.9 ns	368,413.9 ns	1.00	Same	0.01	1.4599	-	-	9,554 B
RecursiveCreateDeleteDirectory	Job-MXCTDU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	363,824.3 ns	3,982.08 ns	3,530.01 ns	364,590.2 ns	356,500.9 ns	370,426.6 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-FNVICF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,005,961.7 ns	43,158.49 ns	38,258.88 ns	4,002,134.2 ns	3,939,368.3 ns	4,092,201.7 ns	1.00	Same	0.01	33.3333	16.6667	-	249,588 B
RecursiveCreateDeleteDirectory	Job-MXCTDU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,016,106.9 ns	55,378.57 ns	43,235.95 ns	4,016,171.0 ns	3,941,038.7 ns	4,079,680.6 ns	1.00	Base	0.00	32.2581	16.1290	-	237,357 B

…ctories.

ghost · 2021-05-04T05:01:22Z

Tagging subscribers to this area: @carlossanlop
See info in area-owners.md if you want to be subscribed.

Issue Details

Fixes #37301

New attempt - this time without a perf regression. Changes in this PR:

Caching the stat and lstat results inside FileStatus.
Collection of information is the same between FileSystemEntry and FileStatus.
The Hidden and ReadOnly flags are now being collected when expected, and made sure they are collected lazily, to avoid the perf regression on enumeration when not required.
`System.IO.FileSystem unit tests passed locally, pending checking all results from CI.

cc @iSazonov @mklement0 @Jozkee @adamsitnik @jeffhandley

I collected perf results for the System.IO.Tests.Perf_Directory benchmarks four times, before and after my changes, because IO benchmarks tend to yield not-so-stable results. I wanted to make sure the results stayed under a close margin of error:

Command:

/home/carlos/.dotnet/dotnet run \
    --project /home/carlos/performance/src/benchmarks/micro/MicroBenchmarks.csproj
    -c Release -f net6.0 \
    --artifacts /home/carlos/perf_together \
    --coreRun \
        /home/carlos/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun \
        /home/carlos/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun \
    --cli /home/carlos/.dotnet/dotnet \
    --statisticalTest 3ms \
    --filter System.IO.Tests.Perf_Directory*

Result 1

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-VQFCFU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,786.0 ns	909.50 ns	1,047.38 ns	20,665.0 ns	19,000.0 ns	23,180.0 ns	1.03	Same	0.07	-	-	-	497 B
CreateDirectory	Job-YTPACX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,123.0 ns	687.54 ns	791.77 ns	19,840.0 ns	19,020.0 ns	21,580.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-ZALFUF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	615.0 ns	6.28 ns	5.87 ns	615.5 ns	598.7 ns	623.2 ns	1.01	Same	0.03	0.0442	-	-	288 B
GetCurrentDirectory	Job-KVFFMU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	606.8 ns	14.38 ns	16.56 ns	605.7 ns	557.5 ns	632.4 ns	1.00	Base	0.00	0.0440	-	-	288 B

Exists	Job-ZALFUF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	622.9 ns	10.46 ns	9.78 ns	624.7 ns	608.5 ns	637.6 ns	1.02	Same	0.02	-	-	-	-
Exists	Job-KVFFMU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	610.9 ns	4.02 ns	3.76 ns	611.2 ns	601.5 ns	616.3 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-ZALFUF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,436,529.1 ns	32,055.46 ns	29,984.70 ns	3,447,346.9 ns	3,380,712.5 ns	3,471,143.8 ns	1.02	Same	0.01	125.0000	-	-	872,324 B
EnumerateFiles	Job-KVFFMU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,361,367.6 ns	34,994.73 ns	31,021.91 ns	3,346,721.9 ns	3,328,408.8 ns	3,430,447.5 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-ZALFUF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	366,592.8 ns	4,279.96 ns	3,573.96 ns	366,223.7 ns	361,246.7 ns	372,439.2 ns	1.00	Same	0.02	1.4535	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-KVFFMU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	366,512.9 ns	6,944.90 ns	6,156.47 ns	365,293.6 ns	357,992.4 ns	378,678.6 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-ZALFUF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,011,570.2 ns	30,733.07 ns	27,244.06 ns	4,013,036.3 ns	3,969,929.0 ns	4,059,991.9 ns	1.01	Same	0.01	32.2581	16.1290	-	249,588 B
RecursiveCreateDeleteDirectory	Job-KVFFMU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,957,395.1 ns	45,248.32 ns	37,784.40 ns	3,959,139.7 ns	3,891,123.8 ns	4,021,439.7 ns	1.00	Base	0.00	31.7460	15.8730	-	237,357 B

Result 2

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-NAOXHK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	19,783.3 ns	791.01 ns	846.38 ns	19,410.0 ns	18,770.0 ns	21,480.0 ns	0.95	Same	0.11	-	-	-	497 B
CreateDirectory	Job-SUNLMH	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,055.6 ns	2,350.29 ns	2,514.79 ns	20,135.0 ns	18,760.0 ns	26,970.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-AIHZTX	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	603.1 ns	7.41 ns	6.93 ns	602.6 ns	586.8 ns	615.6 ns	1.00	Same	0.01	0.0457	-	-	288 B
GetCurrentDirectory	Job-HOTEOR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	600.8 ns	2.30 ns	2.15 ns	600.4 ns	597.4 ns	604.4 ns	1.00	Base	0.00	0.0436	-	-	288 B

Exists	Job-AIHZTX	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	614.7 ns	5.18 ns	4.60 ns	614.4 ns	609.7 ns	623.1 ns	1.01	Same	0.01	-	-	-	-
Exists	Job-HOTEOR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	611.0 ns	4.58 ns	4.06 ns	609.4 ns	604.1 ns	618.4 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-AIHZTX	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,441,360.7 ns	26,152.90 ns	23,183.86 ns	3,438,537.5 ns	3,398,874.2 ns	3,485,755.5 ns	1.03	Same	0.01	125.0000	-	-	872,323 B
EnumerateFiles	Job-HOTEOR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,332,139.2 ns	25,884.69 ns	24,212.56 ns	3,331,166.2 ns	3,300,743.8 ns	3,363,672.5 ns	1.00	Base	0.00	137.5000	-	-	872,322 B

RecursiveCreateDeleteDirectory	Job-AIHZTX	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	367,497.6 ns	4,021.55 ns	3,565.00 ns	366,880.6 ns	361,300.4 ns	374,970.8 ns	1.01	Same	0.01	1.4620	-	-	9,554 B
RecursiveCreateDeleteDirectory	Job-HOTEOR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	364,194.4 ns	4,306.78 ns	3,596.36 ns	364,351.7 ns	359,269.8 ns	369,916.0 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-AIHZTX	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,007,709.4 ns	39,706.47 ns	33,156.70 ns	4,011,190.5 ns	3,937,668.3 ns	4,054,766.7 ns	1.00	Same	0.01	31.7460	15.8730	-	249,587 B
RecursiveCreateDeleteDirectory	Job-HOTEOR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,002,334.2 ns	34,737.30 ns	30,793.71 ns	3,997,458.9 ns	3,952,767.7 ns	4,060,111.3 ns	1.00	Base	0.00	32.2581	16.1290	-	237,357 B

Result 3

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-PDEYFB	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,425.8 ns	1,504.72 ns	1,672.50 ns	19,930.0 ns	18,730.0 ns	24,170.0 ns	0.99	Same	0.10	-	-	-	497 B
CreateDirectory	Job-OWNBSX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,690.5 ns	1,000.45 ns	1,112.00 ns	20,760.0 ns	18,990.0 ns	22,770.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-MLRFUU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	609.1 ns	8.71 ns	8.15 ns	610.9 ns	593.9 ns	623.5 ns	1.00	Same	0.02	0.0452	-	-	288 B
GetCurrentDirectory	Job-ZSPQVX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	606.5 ns	7.70 ns	7.21 ns	606.4 ns	591.4 ns	616.1 ns	1.00	Base	0.00	0.0459	-	-	288 B

Exists	Job-MLRFUU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	620.7 ns	1.91 ns	1.78 ns	620.0 ns	618.4 ns	624.1 ns	1.00	Same	0.01	-	-	-	-
Exists	Job-ZSPQVX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	621.7 ns	4.35 ns	4.07 ns	623.0 ns	613.1 ns	625.9 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-MLRFUU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,492,924.1 ns	31,351.68 ns	29,326.38 ns	3,489,420.3 ns	3,446,018.8 ns	3,538,670.3 ns	1.03	Same	0.01	125.0000	-	-	872,324 B
EnumerateFiles	Job-ZSPQVX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,391,640.5 ns	33,177.29 ns	31,034.06 ns	3,391,781.2 ns	3,344,562.5 ns	3,461,081.2 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-MLRFUU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	419,711.6 ns	27,996.69 ns	32,241.03 ns	429,124.8 ns	361,567.1 ns	468,078.5 ns	1.18	Same	0.05	-	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-ZSPQVX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	366,426.2 ns	6,737.50 ns	5,260.20 ns	365,630.5 ns	360,113.6 ns	380,890.1 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-MLRFUU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,012,941.6 ns	50,257.57 ns	44,552.02 ns	4,006,118.5 ns	3,955,548.4 ns	4,093,054.8 ns	1.00	Same	0.01	32.2581	16.1290	-	249,588 B
RecursiveCreateDeleteDirectory	Job-ZSPQVX	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,031,409.2 ns	39,659.96 ns	35,157.52 ns	4,019,719.4 ns	3,995,309.7 ns	4,119,485.5 ns	1.00	Base	0.00	32.2581	16.1290	-	237,348 B

Result 4

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-ODAKGD	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,361.1 ns	2,064.33 ns	2,294.49 ns	20,610.0 ns	19,150.0 ns	27,150.0 ns	1.04	Same	0.13	-	-	-	497 B
CreateDirectory	Job-OVXERW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,603.2 ns	1,332.69 ns	1,481.28 ns	20,030.0 ns	19,060.0 ns	24,150.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-FNVICF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	596.2 ns	8.61 ns	8.05 ns	597.1 ns	581.3 ns	607.6 ns	1.00	Same	0.02	0.0435	-	-	288 B
GetCurrentDirectory	Job-MXCTDU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	597.5 ns	10.43 ns	9.25 ns	597.7 ns	584.1 ns	616.2 ns	1.00	Base	0.00	0.0452	-	-	288 B

Exists	Job-FNVICF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	618.3 ns	5.64 ns	5.28 ns	617.5 ns	611.5 ns	630.4 ns	0.99	Same	0.01	-	-	-	-
Exists	Job-MXCTDU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	623.7 ns	3.24 ns	3.04 ns	624.3 ns	619.3 ns	628.6 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-FNVICF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,393,408.9 ns	32,024.75 ns	29,955.97 ns	3,396,978.8 ns	3,329,993.8 ns	3,436,910.0 ns	1.02	Same	0.01	137.5000	-	-	872,322 B
EnumerateFiles	Job-MXCTDU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,337,261.2 ns	45,611.81 ns	42,665.32 ns	3,348,791.2 ns	3,274,133.8 ns	3,411,288.8 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-FNVICF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	364,870.1 ns	4,342.78 ns	3,626.42 ns	365,444.7 ns	356,443.9 ns	368,413.9 ns	1.00	Same	0.01	1.4599	-	-	9,554 B
RecursiveCreateDeleteDirectory	Job-MXCTDU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	363,824.3 ns	3,982.08 ns	3,530.01 ns	364,590.2 ns	356,500.9 ns	370,426.6 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-FNVICF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,005,961.7 ns	43,158.49 ns	38,258.88 ns	4,002,134.2 ns	3,939,368.3 ns	4,092,201.7 ns	1.00	Same	0.01	33.3333	16.6667	-	249,588 B
RecursiveCreateDeleteDirectory	Job-MXCTDU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,016,106.9 ns	55,378.57 ns	43,235.95 ns	4,016,171.0 ns	3,941,038.7 ns	4,079,680.6 ns	1.00	Base	0.00	32.2581	16.1290	-	237,357 B

Author:	carlossanlop
Assignees:	carlossanlop
Labels:	`area-System.IO`
Milestone:	6.0.0

src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEntry.Unix.cs

…tatus.GetAttributes from FileSYstemEntry.Attributes since the disk hit is necessary anyway.

carlossanlop · 2021-05-04T05:55:44Z

Updated perf results for commit 8c23640 . Ran them 4 times again since IO results tend to be somewhat volatile:

Result 1

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-KLVWOM	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,118.9 ns	961.31 ns	1,068.49 ns	19,730.0 ns	18,940.0 ns	22,920.0 ns	1.02	Same	0.05	-	-	-	497 B
CreateDirectory	Job-EPNNZC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	19,608.2 ns	548.88 ns	563.66 ns	19,550.0 ns	18,830.0 ns	20,670.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-JXFPGD	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	588.7 ns	6.92 ns	6.13 ns	588.5 ns	579.6 ns	599.9 ns	0.99	Same	0.01	0.0448	-	-	288 B
GetCurrentDirectory	Job-TJZQVV	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	596.1 ns	6.76 ns	6.32 ns	594.0 ns	588.4 ns	607.4 ns	1.00	Base	0.00	0.0454	-	-	288 B

Exists	Job-JXFPGD	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	621.2 ns	3.30 ns	3.08 ns	620.9 ns	615.6 ns	628.2 ns	1.01	Same	0.00	-	-	-	-
Exists	Job-TJZQVV	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	618.0 ns	1.59 ns	1.41 ns	618.2 ns	615.4 ns	620.0 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-JXFPGD	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,407,003.2 ns	43,186.92 ns	38,284.08 ns	3,407,499.2 ns	3,350,123.4 ns	3,473,809.4 ns	1.01	Same	0.01	125.0000	-	-	872,324 B
EnumerateFiles	Job-TJZQVV	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,359,020.1 ns	29,605.76 ns	26,244.74 ns	3,358,570.6 ns	3,310,930.0 ns	3,396,732.5 ns	1.00	Base	0.00	137.5000	-	-	872,322 B

RecursiveCreateDeleteDirectory	Job-JXFPGD	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	376,146.6 ns	6,610.95 ns	5,520.44 ns	374,412.5 ns	371,302.5 ns	388,699.4 ns	1.02	Same	0.02	1.4535	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-TJZQVV	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	367,161.2 ns	3,842.77 ns	3,406.52 ns	368,448.4 ns	360,590.3 ns	370,804.0 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-JXFPGD	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,988,412.0 ns	31,731.87 ns	28,129.48 ns	3,985,887.3 ns	3,942,207.9 ns	4,053,917.5 ns	0.99	Same	0.02	31.7460	15.8730	-	249,597 B
RecursiveCreateDeleteDirectory	Job-TJZQVV	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,029,709.0 ns	85,142.63 ns	94,635.80 ns	3,993,288.9 ns	3,921,644.4 ns	4,250,427.0 ns	1.00	Base	0.00	31.7460	15.8730	-	237,363 B

Result 2

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-BHAAHE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,314.0 ns	1,604.12 ns	1,847.31 ns	20,415.0 ns	19,170.0 ns	25,160.0 ns	1.01	Same	0.13	-	-	-	497 B
CreateDirectory	Job-OCBZNF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,147.4 ns	1,354.61 ns	1,505.64 ns	20,780.0 ns	19,250.0 ns	25,090.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-EINRQE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	594.0 ns	6.87 ns	6.42 ns	593.4 ns	582.5 ns	603.6 ns	0.99	Same	0.02	0.0458	-	-	288 B
GetCurrentDirectory	Job-ZDPMOI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	597.4 ns	8.28 ns	7.75 ns	598.6 ns	582.7 ns	610.6 ns	1.00	Base	0.00	0.0449	-	-	288 B

Exists	Job-EINRQE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	617.2 ns	1.16 ns	1.03 ns	617.2 ns	615.6 ns	619.3 ns	1.00	Same	0.00	-	-	-	-
Exists	Job-ZDPMOI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	617.2 ns	2.79 ns	2.47 ns	617.1 ns	612.2 ns	622.3 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-EINRQE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,416,316.6 ns	28,523.19 ns	25,285.06 ns	3,412,961.9 ns	3,366,488.8 ns	3,466,455.0 ns	1.02	Same	0.01	137.5000	-	-	872,321 B
EnumerateFiles	Job-ZDPMOI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,349,468.1 ns	38,082.60 ns	35,622.49 ns	3,336,828.8 ns	3,309,318.8 ns	3,420,285.0 ns	1.00	Base	0.00	137.5000	-	-	872,322 B

RecursiveCreateDeleteDirectory	Job-EINRQE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	375,628.3 ns	4,144.94 ns	3,461.21 ns	375,875.2 ns	370,431.4 ns	381,486.1 ns	1.04	Same	0.01	1.5244	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-ZDPMOI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	362,718.0 ns	2,442.61 ns	2,165.31 ns	362,212.9 ns	360,070.2 ns	367,061.5 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-EINRQE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,994,834.7 ns	25,084.25 ns	22,236.54 ns	4,000,928.2 ns	3,962,641.9 ns	4,031,296.8 ns	0.99	Same	0.01	32.2581	16.1290	-	249,588 B
RecursiveCreateDeleteDirectory	Job-ZDPMOI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,017,969.6 ns	38,105.45 ns	29,750.23 ns	4,023,290.3 ns	3,962,119.4 ns	4,064,317.7 ns	1.00	Base	0.00	32.2581	16.1290	-	237,348 B

Result 3

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-XJFKXL	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	24,934.0 ns	2,448.65 ns	2,819.87 ns	24,845.0 ns	19,700.0 ns	29,640.0 ns	1.18	Same	0.16	-	-	-	497 B
CreateDirectory	Job-TLRLOW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,288.9 ns	1,595.72 ns	1,773.64 ns	22,030.0 ns	19,190.0 ns	24,360.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-HIUTWP	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	608.6 ns	16.78 ns	19.33 ns	601.3 ns	588.6 ns	650.8 ns	1.03	Same	0.03	0.0451	-	-	288 B
GetCurrentDirectory	Job-LSOWZC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	595.6 ns	7.89 ns	7.38 ns	594.8 ns	582.8 ns	607.0 ns	1.00	Base	0.00	0.0440	-	-	288 B

Exists	Job-HIUTWP	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	616.3 ns	3.24 ns	3.03 ns	615.9 ns	610.9 ns	620.9 ns	1.00	Same	0.01	-	-	-	-
Exists	Job-LSOWZC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	618.3 ns	2.08 ns	1.85 ns	617.9 ns	615.7 ns	621.1 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-HIUTWP	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,392,687.6 ns	27,176.79 ns	25,421.19 ns	3,397,117.5 ns	3,341,993.8 ns	3,420,568.8 ns	1.02	Same	0.01	137.5000	-	-	872,322 B
EnumerateFiles	Job-LSOWZC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,333,395.3 ns	18,976.86 ns	14,815.88 ns	3,338,178.8 ns	3,295,822.5 ns	3,349,588.8 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-HIUTWP	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	374,385.2 ns	7,088.30 ns	6,630.40 ns	375,767.3 ns	362,969.6 ns	385,848.8 ns	1.02	Same	0.02	1.4881	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-LSOWZC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	366,739.1 ns	3,751.80 ns	3,325.87 ns	367,350.3 ns	360,142.3 ns	371,045.5 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-HIUTWP	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,006,857.1 ns	43,037.73 ns	35,938.45 ns	4,006,961.3 ns	3,941,262.9 ns	4,054,119.4 ns	1.00	Same	0.01	32.2581	16.1290	-	249,588 B
RecursiveCreateDeleteDirectory	Job-LSOWZC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,009,366.8 ns	34,591.84 ns	30,664.77 ns	4,007,508.9 ns	3,968,669.4 ns	4,051,300.0 ns	1.00	Base	0.00	32.2581	16.1290	-	237,348 B

Result 4

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-TIWVND	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,542.6 ns	1,998.82 ns	2,221.69 ns	21,110.0 ns	18,490.0 ns	25,990.0 ns	1.05	Same	0.15	-	-	-	497 B
CreateDirectory	Job-PLXRAS	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,576.0 ns	1,281.68 ns	1,475.99 ns	19,755.0 ns	19,000.0 ns	24,080.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-IBYOIQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	586.2 ns	6.02 ns	5.63 ns	588.2 ns	576.5 ns	596.5 ns	0.99	Same	0.01	0.0443	-	-	288 B
GetCurrentDirectory	Job-REDLKB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	593.0 ns	4.98 ns	4.42 ns	594.4 ns	583.8 ns	598.8 ns	1.00	Base	0.00	0.0455	-	-	288 B

Exists	Job-IBYOIQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	614.5 ns	2.31 ns	2.16 ns	615.0 ns	610.5 ns	617.4 ns	1.00	Same	0.00	-	-	-	-
Exists	Job-REDLKB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	616.8 ns	2.87 ns	2.55 ns	616.7 ns	612.7 ns	620.6 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-IBYOIQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,426,692.7 ns	29,286.75 ns	25,961.94 ns	3,423,271.9 ns	3,380,446.2 ns	3,472,807.5 ns	1.03	Same	0.01	137.5000	-	-	872,321 B
EnumerateFiles	Job-REDLKB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,342,421.2 ns	29,094.69 ns	27,215.19 ns	3,339,922.5 ns	3,300,196.2 ns	3,404,238.8 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-IBYOIQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	381,788.8 ns	4,161.45 ns	3,475.00 ns	382,852.5 ns	375,710.1 ns	386,669.0 ns	1.05	Same	0.02	1.4881	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-REDLKB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	365,387.8 ns	4,974.94 ns	4,154.30 ns	365,315.1 ns	359,014.1 ns	374,928.3 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-IBYOIQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,007,891.4 ns	22,188.17 ns	17,323.07 ns	4,008,345.8 ns	3,971,325.0 ns	4,033,416.7 ns	0.99	Same	0.01	33.3333	16.6667	-	249,598 B
RecursiveCreateDeleteDirectory	Job-REDLKB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,057,374.0 ns	31,182.41 ns	27,642.39 ns	4,053,872.0 ns	4,007,922.0 ns	4,107,245.8 ns	1.00	Base	0.00	33.8983	16.9492	-	237,348 B

iSazonov · 2021-05-04T07:12:46Z

src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEntry.Unix.cs

        public long Length => _status.GetLength(FullPath, continueOnError: true);
        public DateTimeOffset CreationTimeUtc => _status.GetCreationTime(FullPath, continueOnError: true);
        public DateTimeOffset LastAccessTimeUtc => _status.GetLastAccessTime(FullPath, continueOnError: true);
        public DateTimeOffset LastWriteTimeUtc => _status.GetLastWriteTime(FullPath, continueOnError: true);
        public bool IsDirectory => _status.InitiallyDirectory;
-        public bool IsHidden => _directoryEntry.Name[0] == '.';
+        public bool IsHidden => _directoryEntry.Name[0] == '.' || _status.IsHidden(FullPath);


I'm afraid it's completely incorrect to map extended attributes to classic attributes.
I think we need new ExtendedAttributes (or something like) on both Unix and Windows.

Please see my other comment: https://github.com/dotnet/runtime/pull/52235/files#r625991197

carlossanlop · 2021-05-04T17:58:40Z

src/libraries/System.IO.FileSystem/src/System/IO/FileStatus.Unix.cs

                attributes |= FileAttributes.Directory;

-            // If the filename starts with a period or has UF_HIDDEN flag set, it's hidden.
-            if (fileName.Length > 0 && (fileName[0] == '.' || (_fileStatus.UserFlags & (uint)Interop.Sys.UserFlags.UF_HIDDEN) == (uint)Interop.Sys.UserFlags.UF_HIDDEN))


@iSazonov, you wrote in the other comment:

I'm afraid it's completely incorrect to map extended attributes to classic attributes.
I think we need new ExtendedAttributes (or something like) on both Unix and Windows.

I completely agree with you that we should have an ExtendedAttributes property. It would solve the problem of having them intermixed with normal attributes.

Extended attributes apply to BSD, Linux, OSX and even for Windows, in the form of Reparse Points.

But as you can see, UF_HIDDEN was already being read in the old code before my PR, and I just made sure it was consistently retrieved in FileSystemInfo, FileSystemEntry and FileStatus.

I agree that it's not an either-or scenario: A platform-specific ExtendedAttributes property definitely makes sense, but it also makes sense to map the UF_HIDDEN flag to a platform-abstracted Hidden attribute (for instance, to the macOS Finder (file manager) both UF_HIDDEN files and files that observe the general Unix name-based convention (name starts with .) are hidden.

Has this ExtendedAttributes property been discussed at all?

Note that macOS has open-ended extended file-system attributes, similar to NTFS alternate streams (use xattr -s -l /tmp to see an example on macOS), but - if I understand correctly - NTFS alternate streams aren't supported (yet) in .NET, so that's probably a discussion for another day.

Has this ExtendedAttributes property been discussed at all?

Yes, we have a relatively new issue tracking this request: #49604

Let's take the conversation there.

But as you can see, UF_HIDDEN was already being read in the old code before my PR, and I just made sure it was consistently retrieved in FileSystemInfo, FileSystemEntry and FileStatus.

It was added at 5.0 milestone without in-depth analysis.
I'd suggest to pass the design through in-depth analysis and API review.
My main concern is that it (chflags) is absolutely another API with specific behaviors and specific error codes.
I have not found a standard for these attributes. The most comprehensive list is https://www.freebsd.org/cgi/man.cgi?query=chflags&sektion=2&manpath=freebsd-release-ports
As we can see there are references to DOS, Windows and CIFS FILE_ATTRIBUTE_* attributes. I don't understand what that means and what the design intentions is.
If there are no standard behavior definitions, I would make different APIs to avoid intractable problems in the future.
There's an attribute mapping, but we can't map "." in UF_HIDDEN.
Perhaps the trend is to abandon classic attributes altogether and only use extended attributes. In that case, we definitely shouldn't mix them.
Since the docs speak about "mapping" then surely this API must perform "." mapping in UF_HIDDEN.
The final thought is that we need to be consistent with the other communities (Java, Python, ...).

After taking a look at #49604 it occurred to me that what we are talking about here is not a case of extended attributes, as the latter are user-definable data with no special meaning to the file-system or the system.

By contrast, the so-called file flags on macOS / FreeBSD - of which UF_HIDDEN is one example - do have system-defined meaning, analogous to the file attributes on Windows.

These file flags do not map cleanly onto the born-on-Windows System.IO.FileAttributes enumeration, though mapping UF_HIDDEN onto Hidden is currently partially implemented:

Examining an enumerated FileSystemInfo instance does surface UF_HIDDEN as the Hidden attribute in .Attributes, but the enumeration itself does not consider such files hidden.

Curiously, the same inconsistency applies to the ls utility on macOS (my guess is that the following also applies to FreeBSD): ls lists UF_HIDDEN files as if they weren't hidden, but ls -lO does list all file flags (including UF_HIDDEN as hidden, the name also used by the chflags utility).
When POSIX-compatible shells on macOS perform globbing, they also do not consider UF_HIDDEN files hidden.

By contrast, Finder, the macOS file manager, equally considers .-initial names and UF_HIDDEN files hidden.

De facto the .Attributes property is already being used to map non-Windows concepts onto the equivalent Windows concepts:

Symlinks on Unix-like platforms get the pseudo attribute ReparsePoint

The user-specific lack of write permissions is mapped on to pseudo attribute ReadOnly

To me, these mappings make sense, but I agree that they should be thoroughly reviewed, with a view toward extending this mapping; e.g., UF_IMMUTABLE and SF_IMMUTABLE are candidates for mapping onto ReadOnly too.

With respect to UF_HIDDEN, we need to decided whether (a) we want to resolve the current inconsistency and, if so, (b) in what direction.

Consistently mapping both .-initial names and UF_HIDDEN files onto Hidden is defensible, even though in the world of shells it would make PowerShell's behavior then differ from that of ls / POSIX-compatible shells.

then surely this API must perform "." mapping in UF_HIDDEN

I don't think so: it seems fine to me to map into one direction: to have the platform-abstracted Hidden attribute reflect whether the file is effectively hidden, irrespective of the mechanism used, and on macOS / FreeBSD there happen to be two mechanisms available, both of which are - unfortunately only partly - honored by the system.

If we were to introduce a dedicated API for macOS / FreeBSD file flags (again, this is not the same as extended attributes), then it should obviously reflect the true flag values only.

After taking a look at #49604 it occurred to me that what we are talking about here is not a case of extended attributes, as the latter are user-definable data with no special meaning to the file-system or the system.

Yes, I suggest to use another terminology here - file system flags/ fsflags/ FileSystemInfo.Flags.

Since mapping is very questionable and may cause breaking conflicts in the future, I suggest avoiding it now and only presenting it in some way.
The application can be fixed faster than .Net. For example, PowerShell will be able to handle UF_HIDDEN in a special way and this can be changed in any intermediate version, unlike .Net which will remain stable from version to version.

src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEntry.Unix.cs

carlossanlop · 2021-05-04T21:05:56Z

Benchmarks for commit 6ff6dcc :

Result 1

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-VVDLFS	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,907.5 ns	1,652.78 ns	1,903.34 ns	19,965.0 ns	18,820.0 ns	25,070.0 ns	1.03	Same	0.11	-	-	-	497 B
CreateDirectory	Job-USGWYY	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,497.8 ns	1,189.18 ns	1,272.41 ns	20,285.0 ns	18,720.0 ns	23,030.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-YXFPIE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	584.0 ns	7.45 ns	6.97 ns	584.7 ns	573.7 ns	597.5 ns	0.83	Same	0.02	0.0447	-	-	288 B
GetCurrentDirectory	Job-XENYPA	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	705.7 ns	9.39 ns	8.78 ns	705.9 ns	691.5 ns	720.3 ns	1.00	Base	0.00	0.0454	-	-	288 B

Exists	Job-YXFPIE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	615.5 ns	11.48 ns	10.74 ns	612.5 ns	600.8 ns	633.5 ns	1.01	Same	0.02	-	-	-	-
Exists	Job-XENYPA	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	608.7 ns	5.61 ns	4.98 ns	607.3 ns	602.3 ns	618.1 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-YXFPIE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,330,084.9 ns	44,555.39 ns	41,677.14 ns	3,306,652.5 ns	3,279,472.5 ns	3,402,281.2 ns	1.02	Same	0.02	137.5000	-	-	872,322 B
EnumerateFiles	Job-XENYPA	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,267,480.2 ns	43,966.46 ns	41,126.26 ns	3,241,173.8 ns	3,222,187.5 ns	3,335,891.2 ns	1.00	Base	0.00	137.5000	-	-	872,322 B

RecursiveCreateDeleteDirectory	Job-YXFPIE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	368,199.4 ns	2,539.93 ns	2,251.58 ns	368,445.9 ns	364,264.6 ns	372,023.5 ns	1.02	Same	0.01	1.5244	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-XENYPA	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	362,420.7 ns	4,837.83 ns	4,039.81 ns	361,166.7 ns	357,779.2 ns	372,701.9 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-YXFPIE	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,989,789.4 ns	76,529.54 ns	67,841.45 ns	3,970,544.2 ns	3,902,195.0 ns	4,109,520.0 ns	1.00	Same	0.02	33.3333	16.6667	-	249,599 B
RecursiveCreateDeleteDirectory	Job-XENYPA	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,001,173.6 ns	55,769.50 ns	46,570.06 ns	3,992,644.8 ns	3,937,267.2 ns	4,114,508.6 ns	1.00	Base	0.00	34.4828	17.2414	-	237,348 B

Result 2

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-PDEIQQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	22,281.0 ns	1,821.16 ns	2,097.25 ns	22,565.0 ns	19,850.0 ns	26,500.0 ns	1.05	Same	0.12	-	-	-	497 B
CreateDirectory	Job-QLPRFB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,302.6 ns	1,008.09 ns	1,120.49 ns	21,200.0 ns	19,580.0 ns	23,820.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-TIPGOK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	575.3 ns	7.90 ns	6.60 ns	574.3 ns	563.4 ns	584.9 ns	0.99	Same	0.02	0.0446	-	-	288 B
GetCurrentDirectory	Job-ASCMUY	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	578.9 ns	7.63 ns	7.14 ns	578.7 ns	569.9 ns	591.9 ns	1.00	Base	0.00	0.0437	-	-	288 B

Exists	Job-TIPGOK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	609.4 ns	5.52 ns	4.89 ns	608.1 ns	603.5 ns	620.9 ns	1.00	Same	0.01	-	-	-	-
Exists	Job-ASCMUY	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	609.0 ns	5.43 ns	5.08 ns	609.5 ns	598.9 ns	618.9 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-TIPGOK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,320,337.6 ns	32,643.41 ns	28,937.53 ns	3,321,426.9 ns	3,281,377.5 ns	3,384,825.0 ns	1.01	Same	0.01	137.5000	-	-	872,322 B
EnumerateFiles	Job-ASCMUY	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,274,043.7 ns	40,312.68 ns	35,736.14 ns	3,274,650.0 ns	3,221,603.8 ns	3,339,098.8 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-TIPGOK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	375,231.9 ns	5,741.47 ns	5,370.58 ns	374,680.9 ns	369,300.2 ns	385,922.2 ns	1.03	Same	0.02	-	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-ASCMUY	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	364,259.4 ns	5,427.89 ns	5,077.25 ns	364,395.2 ns	356,805.5 ns	373,018.8 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-TIPGOK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,936,271.2 ns	54,581.87 ns	48,385.40 ns	3,917,425.0 ns	3,894,454.7 ns	4,036,285.9 ns	1.01	Same	0.01	31.2500	15.6250	-	249,587 B
RecursiveCreateDeleteDirectory	Job-ASCMUY	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,892,693.0 ns	48,646.46 ns	37,979.96 ns	3,890,176.6 ns	3,840,934.4 ns	3,973,734.4 ns	1.00	Base	0.00	31.2500	15.6250	-	237,356 B

Result 3

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-ESOYGA	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,756.8 ns	1,577.26 ns	1,753.11 ns	21,950.0 ns	19,340.0 ns	26,420.0 ns	1.08	Same	0.12	-	-	-	497 B
CreateDirectory	Job-YZLVZL	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,193.5 ns	1,319.99 ns	1,520.10 ns	19,360.0 ns	18,660.0 ns	23,450.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-RFQHQQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	700.9 ns	8.01 ns	7.10 ns	700.9 ns	688.6 ns	716.8 ns	1.20	Same	0.02	0.0441	-	-	288 B
GetCurrentDirectory	Job-QKYKLI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	583.5 ns	10.20 ns	9.54 ns	581.8 ns	567.7 ns	606.2 ns	1.00	Base	0.00	0.0447	-	-	288 B

Exists	Job-RFQHQQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	609.8 ns	7.87 ns	6.57 ns	607.0 ns	602.8 ns	625.9 ns	0.98	Same	0.03	-	-	-	-
Exists	Job-QKYKLI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	617.9 ns	14.29 ns	16.46 ns	609.8 ns	600.6 ns	649.3 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-RFQHQQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,365,645.5 ns	36,844.50 ns	32,661.69 ns	3,370,111.9 ns	3,296,841.2 ns	3,418,535.0 ns	1.03	Same	0.01	137.5000	-	-	872,322 B
EnumerateFiles	Job-QKYKLI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,260,103.9 ns	32,985.98 ns	27,544.79 ns	3,254,982.5 ns	3,216,381.2 ns	3,293,961.2 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-RFQHQQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	490,605.6 ns	87,642.26 ns	100,928.96 ns	560,925.3 ns	361,054.6 ns	597,503.8 ns	1.54	Same	0.17	-	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-QKYKLI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	359,853.2 ns	6,111.45 ns	5,103.34 ns	359,146.7 ns	353,130.4 ns	370,652.6 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-RFQHQQ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,997,207.8 ns	43,389.81 ns	38,463.93 ns	3,989,723.4 ns	3,934,275.0 ns	4,079,842.2 ns	1.00	Same	0.02	31.2500	15.6250	-	249,611 B
RecursiveCreateDeleteDirectory	Job-QKYKLI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,990,376.3 ns	67,516.31 ns	69,334.28 ns	3,974,352.4 ns	3,903,960.3 ns	4,166,361.9 ns	1.00	Base	0.00	31.7460	15.8730	-	237,363 B

Result 4

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-KIGLKG	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,992.8 ns	1,402.30 ns	1,500.45 ns	20,535.0 ns	19,350.0 ns	23,640.0 ns	1.07	Same	0.08	-	-	-	497 B
CreateDirectory	Job-EMXAJI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	19,603.9 ns	760.41 ns	813.63 ns	19,310.0 ns	18,930.0 ns	21,950.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-MVQPHR	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	579.0 ns	11.35 ns	11.15 ns	574.4 ns	567.6 ns	603.1 ns	1.00	Same	0.02	0.0442	-	-	288 B
GetCurrentDirectory	Job-WZZAJC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	579.0 ns	8.36 ns	7.82 ns	575.7 ns	569.3 ns	596.3 ns	1.00	Base	0.00	0.0437	-	-	288 B

Exists	Job-MVQPHR	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	628.0 ns	4.98 ns	4.66 ns	626.4 ns	622.0 ns	636.0 ns	1.03	Same	0.01	-	-	-	-
Exists	Job-WZZAJC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	613.3 ns	7.69 ns	6.42 ns	613.2 ns	605.5 ns	627.4 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-MVQPHR	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,338,918.3 ns	22,794.04 ns	20,206.32 ns	3,333,450.0 ns	3,315,165.6 ns	3,384,576.6 ns	1.03	Same	0.01	125.0000	-	-	872,324 B
EnumerateFiles	Job-WZZAJC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,248,919.3 ns	24,134.01 ns	21,394.17 ns	3,242,780.0 ns	3,226,401.2 ns	3,301,188.8 ns	1.00	Base	0.00	137.5000	-	-	872,322 B

RecursiveCreateDeleteDirectory	Job-MVQPHR	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	370,444.9 ns	3,798.53 ns	3,367.30 ns	370,755.9 ns	363,592.2 ns	374,380.8 ns	1.02	Same	0.02	1.5244	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-WZZAJC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	362,530.4 ns	7,855.72 ns	8,067.25 ns	361,288.3 ns	351,859.0 ns	384,128.5 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-MVQPHR	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,976,912.1 ns	57,024.36 ns	50,550.61 ns	3,982,212.1 ns	3,898,264.5 ns	4,097,304.8 ns	1.01	Same	0.02	32.2581	16.1290	-	249,588 B
RecursiveCreateDeleteDirectory	Job-WZZAJC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,954,625.2 ns	79,623.92 ns	88,501.77 ns	3,933,041.3 ns	3,837,947.6 ns	4,162,442.9 ns	1.00	Base	0.00	31.7460	15.8730	-	237,363 B

src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEntry.Unix.cs

src/libraries/System.IO.FileSystem/src/System/IO/FileStatus.Unix.cs

src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEntry.Unix.cs

src/libraries/System.IO.FileSystem/src/System/IO/FileStatus.Unix.cs

…cessibility of methods/properties. Addressing suggestions.

carlossanlop · 2021-05-05T04:31:55Z

Benchmark results for commit 2423af0 :

Result 1

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-PYCATU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,510.0 ns	1,152.13 ns	1,280.59 ns	20,250.0 ns	19,100.0 ns	23,090.0 ns	1.04	Same	0.08	-	-	-	497 B
CreateDirectory	Job-FGAOLC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	19,722.0 ns	971.28 ns	1,118.53 ns	19,215.0 ns	18,710.0 ns	22,220.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-LUFDZF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	755.0 ns	7.84 ns	7.34 ns	754.5 ns	733.2 ns	763.5 ns	1.22	Same	0.02	0.0446	-	-	288 B
GetCurrentDirectory	Job-NLQLLB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	619.9 ns	6.14 ns	5.45 ns	621.4 ns	604.7 ns	624.8 ns	1.00	Base	0.00	0.0452	-	-	288 B

Exists	Job-LUFDZF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	630.8 ns	2.84 ns	2.52 ns	629.9 ns	627.8 ns	635.3 ns	0.98	Same	0.01	-	-	-	-
Exists	Job-NLQLLB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	641.1 ns	2.85 ns	2.38 ns	639.8 ns	638.7 ns	645.7 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-LUFDZF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,623,996.8 ns	11,848.92 ns	11,083.49 ns	3,626,673.8 ns	3,604,285.0 ns	3,641,355.0 ns	1.05	Same	0.01	137.5000	-	-	872,322 B
EnumerateFiles	Job-NLQLLB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,456,606.4 ns	20,206.76 ns	18,901.42 ns	3,456,805.0 ns	3,427,641.2 ns	3,495,478.8 ns	1.00	Base	0.00	137.5000	-	-	872,322 B

RecursiveCreateDeleteDirectory	Job-LUFDZF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	383,865.2 ns	3,777.14 ns	3,348.34 ns	383,845.9 ns	377,380.6 ns	389,883.4 ns	1.01	Same	0.01	1.5244	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-NLQLLB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	378,701.3 ns	1,532.01 ns	1,279.30 ns	378,456.1 ns	377,142.9 ns	381,875.3 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-LUFDZF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,150,051.5 ns	45,827.62 ns	42,867.18 ns	4,135,498.2 ns	4,085,964.9 ns	4,217,273.7 ns	0.99	Same	0.01	35.0877	17.5439	-	249,589 B
RecursiveCreateDeleteDirectory	Job-NLQLLB	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,180,299.5 ns	53,252.12 ns	47,206.62 ns	4,186,552.5 ns	4,090,898.3 ns	4,256,348.3 ns	1.00	Base	0.00	33.3333	16.6667	-	237,348 B

Result 2

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-IKOLOY	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,323.2 ns	870.59 ns	967.66 ns	19,960.0 ns	19,220.0 ns	22,630.0 ns	0.93	Same	0.12	-	-	-	497 B
CreateDirectory	Job-WZDJPF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	22,425.0 ns	3,119.36 ns	3,592.26 ns	21,065.0 ns	19,390.0 ns	30,790.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-JMKWUK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	622.7 ns	8.40 ns	7.85 ns	623.8 ns	609.6 ns	635.5 ns	1.01	Same	0.02	0.0450	-	-	288 B
GetCurrentDirectory	Job-XQLUZF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	618.8 ns	10.89 ns	10.19 ns	621.1 ns	601.0 ns	632.9 ns	1.00	Base	0.00	0.0455	-	-	288 B

Exists	Job-JMKWUK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	628.5 ns	5.67 ns	5.30 ns	626.6 ns	621.5 ns	637.6 ns	0.99	Same	0.01	-	-	-	-
Exists	Job-XQLUZF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	633.6 ns	6.23 ns	5.20 ns	632.8 ns	627.2 ns	647.3 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-JMKWUK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,632,845.3 ns	37,983.36 ns	35,529.66 ns	3,624,150.0 ns	3,578,267.2 ns	3,691,767.2 ns	1.05	Same	0.01	125.0000	-	-	872,324 B
EnumerateFiles	Job-XQLUZF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,472,034.9 ns	29,201.62 ns	27,315.22 ns	3,462,896.2 ns	3,411,270.0 ns	3,518,593.8 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-JMKWUK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	381,956.1 ns	2,719.51 ns	2,410.78 ns	382,616.1 ns	377,222.0 ns	385,398.1 ns	1.01	Same	0.01	1.4881	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-XQLUZF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	379,857.8 ns	3,463.14 ns	3,069.98 ns	378,387.6 ns	376,306.2 ns	386,016.5 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-JMKWUK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,196,538.5 ns	45,688.77 ns	40,501.90 ns	4,189,187.1 ns	4,145,500.0 ns	4,274,684.5 ns	0.99	Same	0.02	34.4828	17.2414	-	249,598 B
RecursiveCreateDeleteDirectory	Job-XQLUZF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,228,410.9 ns	53,289.77 ns	47,239.99 ns	4,228,038.1 ns	4,157,230.5 ns	4,299,239.0 ns	1.00	Base	0.00	33.8983	16.9492	-	237,348 B

Result 3

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-OHWLGI	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,966.7 ns	1,711.29 ns	1,831.06 ns	20,210.0 ns	18,990.0 ns	25,330.0 ns	1.06	Same	0.11	-	-	-	497 B
CreateDirectory	Job-HPJXYI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	19,872.1 ns	876.64 ns	974.39 ns	19,590.0 ns	18,890.0 ns	22,460.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-PJYUZW	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	629.1 ns	5.30 ns	4.96 ns	628.3 ns	617.5 ns	637.4 ns	1.02	Same	0.02	0.0451	-	-	288 B
GetCurrentDirectory	Job-TSNWTD	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	618.3 ns	9.42 ns	7.87 ns	621.1 ns	597.7 ns	623.7 ns	1.00	Base	0.00	0.0448	-	-	288 B

Exists	Job-PJYUZW	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	625.4 ns	2.30 ns	1.92 ns	625.3 ns	622.8 ns	629.5 ns	1.00	Same	0.00	-	-	-	-
Exists	Job-TSNWTD	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	627.6 ns	1.99 ns	1.66 ns	627.0 ns	624.8 ns	630.2 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-PJYUZW	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,618,864.3 ns	31,422.81 ns	29,392.91 ns	3,623,175.0 ns	3,561,137.5 ns	3,683,871.9 ns	1.03	Same	0.01	125.0000	-	-	872,323 B
EnumerateFiles	Job-TSNWTD	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,496,475.0 ns	42,470.86 ns	37,649.31 ns	3,508,363.3 ns	3,371,689.8 ns	3,517,394.5 ns	1.00	Base	0.00	125.0000	-	-	872,324 B

RecursiveCreateDeleteDirectory	Job-PJYUZW	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	377,562.2 ns	2,964.31 ns	2,627.79 ns	377,282.3 ns	374,020.8 ns	383,973.1 ns	1.00	Same	0.01	-	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-TSNWTD	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	377,386.5 ns	2,170.89 ns	2,030.65 ns	377,742.3 ns	374,507.0 ns	380,499.4 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-PJYUZW	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,158,293.7 ns	19,667.89 ns	17,435.08 ns	4,158,608.6 ns	4,128,251.7 ns	4,185,205.2 ns	1.00	Same	0.01	34.4828	17.2414	-	249,598 B
RecursiveCreateDeleteDirectory	Job-TSNWTD	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,148,954.2 ns	36,124.48 ns	33,790.87 ns	4,155,380.3 ns	4,080,109.8 ns	4,203,636.1 ns	1.00	Base	0.00	32.7869	16.3934	-	237,348 B

Result 4

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-MGMFOL	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	23,158.9 ns	3,756.88 ns	4,175.76 ns	21,470.0 ns	19,400.0 ns	31,990.0 ns	1.12	Same	0.16	-	-	-	497 B
CreateDirectory	Job-KAYZCM	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,604.7 ns	1,136.91 ns	1,263.68 ns	20,260.0 ns	19,170.0 ns	23,910.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-WMDMWS	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	614.9 ns	7.30 ns	6.09 ns	614.6 ns	604.8 ns	628.0 ns	0.98	Same	0.02	0.0445	-	-	288 B
GetCurrentDirectory	Job-ZNOIKF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	625.9 ns	6.61 ns	6.18 ns	626.3 ns	610.9 ns	637.3 ns	1.00	Base	0.00	0.0443	-	-	288 B

Exists	Job-WMDMWS	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	631.5 ns	6.34 ns	5.29 ns	631.5 ns	624.4 ns	643.4 ns	0.99	Same	0.01	-	-	-	-
Exists	Job-ZNOIKF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	636.0 ns	5.50 ns	4.88 ns	634.3 ns	630.6 ns	646.4 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-WMDMWS	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,684,260.1 ns	41,328.66 ns	34,511.30 ns	3,682,720.3 ns	3,638,531.2 ns	3,773,748.4 ns	1.05	Same	0.01	125.0000	-	-	872,324 B
EnumerateFiles	Job-ZNOIKF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,507,608.8 ns	60,876.35 ns	50,834.51 ns	3,516,359.4 ns	3,440,853.1 ns	3,597,017.2 ns	1.00	Base	0.00	125.0000	-	-	872,324 B

RecursiveCreateDeleteDirectory	Job-WMDMWS	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	387,218.6 ns	3,155.10 ns	2,634.65 ns	387,103.0 ns	382,537.0 ns	392,134.3 ns	1.01	Same	0.01	1.5244	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-ZNOIKF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	384,995.0 ns	5,847.69 ns	4,883.08 ns	384,598.8 ns	378,763.1 ns	396,454.1 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-WMDMWS	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,216,276.8 ns	59,835.40 ns	53,042.52 ns	4,201,937.3 ns	4,149,579.7 ns	4,336,372.9 ns	0.99	Same	0.02	33.8983	16.9492	-	249,588 B
RecursiveCreateDeleteDirectory	Job-ZNOIKF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,264,775.7 ns	86,587.22 ns	96,241.47 ns	4,229,869.8 ns	4,146,198.1 ns	4,498,635.8 ns	1.00	Base	0.00	37.7358	18.8679	-	237,350 B

src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEntry.Unix.cs

src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEnumerator.Unix.cs

src/libraries/System.IO.FileSystem/src/System/IO/FileStatus.Unix.cs

… struct initialization. Simplify the order in which Initialize checks for unknown and symlink and add a comment.

carlossanlop · 2021-05-07T01:57:51Z

Benchmark results for commit 7de7c4a :

Result 1

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-WICJCY	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,993.7 ns	1,814.35 ns	2,016.65 ns	21,690.0 ns	19,410.0 ns	27,760.0 ns	1.04	Same	0.08	-	-	-	497 B
CreateDirectory	Job-TORSXT	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,108.9 ns	1,196.24 ns	1,329.62 ns	20,490.0 ns	19,560.0 ns	24,050.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-LOOJLZ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	600.6 ns	7.93 ns	7.41 ns	599.2 ns	589.3 ns	616.6 ns	1.01	Same	0.02	0.0452	-	-	288 B
GetCurrentDirectory	Job-BCENGW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	593.3 ns	9.21 ns	8.62 ns	591.9 ns	577.3 ns	605.0 ns	1.00	Base	0.00	0.0448	-	-	288 B

Exists	Job-LOOJLZ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	622.9 ns	6.24 ns	5.53 ns	623.5 ns	614.1 ns	633.5 ns	1.01	Same	0.01	-	-	-	-
Exists	Job-BCENGW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	615.3 ns	2.12 ns	1.87 ns	615.2 ns	611.9 ns	618.8 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-LOOJLZ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,494,527.5 ns	25,600.43 ns	22,694.12 ns	3,494,793.8 ns	3,453,531.2 ns	3,537,435.9 ns	1.04	Same	0.01	125.0000	-	-	872,324 B
EnumerateFiles	Job-BCENGW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,348,581.5 ns	28,799.32 ns	26,938.90 ns	3,357,093.8 ns	3,306,862.5 ns	3,385,490.0 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-LOOJLZ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	370,109.4 ns	5,913.57 ns	4,938.10 ns	369,765.3 ns	362,168.8 ns	381,654.4 ns	1.01	Same	0.02	1.4535	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-BCENGW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	367,434.2 ns	4,168.79 ns	3,695.52 ns	366,636.3 ns	361,772.0 ns	374,002.5 ns	1.00	Base	0.00	-	-	-	8,114 B

RecursiveCreateDeleteDirectory	Job-LOOJLZ	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,042,290.7 ns	29,984.26 ns	26,580.27 ns	4,041,184.7 ns	4,005,667.7 ns	4,104,238.7 ns	1.00	Same	0.01	32.2581	16.1290	-	249,588 B
RecursiveCreateDeleteDirectory	Job-BCENGW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,031,567.4 ns	33,931.55 ns	28,334.38 ns	4,033,351.6 ns	3,989,146.8 ns	4,090,862.9 ns	1.00	Base	0.00	32.2581	16.1290	-	237,357 B

Result 2

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-YXMUDF	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	22,390.6 ns	1,997.32 ns	2,137.11 ns	22,185.0 ns	19,720.0 ns	27,630.0 ns	1.04	Same	0.14	-	-	-	497 B
CreateDirectory	Job-ODUHPI	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,580.6 ns	1,281.88 ns	1,371.60 ns	21,460.0 ns	19,530.0 ns	24,020.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-UHJMUY	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	598.3 ns	7.28 ns	6.45 ns	597.2 ns	586.9 ns	608.6 ns	0.98	Same	0.01	0.0456	-	-	288 B
GetCurrentDirectory	Job-LGWYQU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	609.0 ns	5.34 ns	4.73 ns	610.0 ns	601.1 ns	618.3 ns	1.00	Base	0.00	0.0458	-	-	288 B

Exists	Job-UHJMUY	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	622.9 ns	5.67 ns	5.03 ns	623.0 ns	613.7 ns	629.7 ns	1.00	Same	0.01	-	-	-	-
Exists	Job-LGWYQU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	621.9 ns	3.18 ns	2.65 ns	621.9 ns	616.5 ns	628.0 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-UHJMUY	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,507,915.2 ns	42,171.03 ns	37,383.52 ns	3,511,701.6 ns	3,401,420.3 ns	3,562,781.2 ns	1.05	Same	0.02	125.0000	-	-	872,323 B
EnumerateFiles	Job-LGWYQU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,352,109.8 ns	52,596.10 ns	49,198.43 ns	3,337,812.5 ns	3,280,206.2 ns	3,442,621.2 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-UHJMUY	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	373,640.4 ns	3,882.35 ns	3,441.60 ns	373,903.2 ns	367,656.9 ns	378,638.7 ns	1.01	Same	0.01	1.4599	-	-	9,554 B
RecursiveCreateDeleteDirectory	Job-LGWYQU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	369,925.1 ns	4,991.45 ns	4,424.79 ns	370,261.9 ns	362,553.8 ns	375,046.4 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-UHJMUY	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,080,033.7 ns	35,540.37 ns	31,505.61 ns	4,080,944.2 ns	4,027,708.3 ns	4,130,751.7 ns	1.00	Same	0.02	33.3333	16.6667	-	249,588 B
RecursiveCreateDeleteDirectory	Job-LGWYQU	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,086,830.4 ns	75,475.36 ns	66,906.94 ns	4,090,776.3 ns	3,996,698.3 ns	4,211,542.4 ns	1.00	Base	0.00	33.8983	16.9492	-	237,348 B

Result 3

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-JKCHNI	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	21,782.1 ns	925.04 ns	1,028.18 ns	21,620.0 ns	20,060.0 ns	23,380.0 ns	1.04	Same	0.08	-	-	-	497 B
CreateDirectory	Job-DNEBMK	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	20,963.7 ns	1,220.51 ns	1,356.60 ns	21,000.0 ns	18,620.0 ns	23,930.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-BUOJVK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	590.8 ns	5.64 ns	5.00 ns	590.7 ns	581.0 ns	599.9 ns	0.99	Same	0.01	0.0446	-	-	288 B
GetCurrentDirectory	Job-QBCFZL	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	594.2 ns	6.57 ns	5.83 ns	595.8 ns	579.5 ns	601.9 ns	1.00	Base	0.00	0.0447	-	-	288 B

Exists	Job-BUOJVK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	623.0 ns	5.81 ns	4.85 ns	622.1 ns	616.8 ns	635.5 ns	1.00	Same	0.01	-	-	-	-
Exists	Job-QBCFZL	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	624.5 ns	7.42 ns	6.58 ns	623.7 ns	616.5 ns	638.3 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-BUOJVK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,473,835.0 ns	36,386.90 ns	32,256.04 ns	3,484,494.5 ns	3,412,528.9 ns	3,514,047.7 ns	1.02	Same	0.01	125.0000	-	-	872,324 B
EnumerateFiles	Job-QBCFZL	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,389,675.2 ns	39,248.15 ns	36,712.75 ns	3,397,813.8 ns	3,326,082.5 ns	3,456,905.0 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-BUOJVK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	375,811.6 ns	4,074.54 ns	3,611.98 ns	375,601.2 ns	370,514.2 ns	383,675.7 ns	1.01	Same	0.02	1.4535	-	-	9,553 B
RecursiveCreateDeleteDirectory	Job-QBCFZL	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	370,439.7 ns	5,412.48 ns	4,798.02 ns	369,431.7 ns	363,972.8 ns	380,177.0 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-BUOJVK	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,073,247.5 ns	42,922.28 ns	35,842.05 ns	4,076,480.3 ns	4,009,627.9 ns	4,151,306.6 ns	1.00	Same	0.01	32.7869	16.3934	-	249,588 B
RecursiveCreateDeleteDirectory	Job-QBCFZL	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,060,052.2 ns	34,558.11 ns	30,634.87 ns	4,058,307.4 ns	4,014,598.4 ns	4,115,075.4 ns	1.00	Base	0.00	32.7869	16.3934	-	237,348 B

Result 4

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-XNJQPO	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	23,286.0 ns	3,883.35 ns	4,472.07 ns	21,720.0 ns	18,590.0 ns	32,620.0 ns	1.02	Same	0.22	-	-	-	497 B
CreateDirectory	Job-PCSTDC	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	23,535.6 ns	2,935.35 ns	3,140.79 ns	22,580.0 ns	20,220.0 ns	29,090.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-JWWACV	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	612.2 ns	8.34 ns	7.80 ns	615.6 ns	595.2 ns	622.5 ns	1.01	Same	0.02	0.0451	-	-	288 B
GetCurrentDirectory	Job-AHMTWF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	608.0 ns	5.43 ns	5.08 ns	608.7 ns	599.5 ns	616.3 ns	1.00	Base	0.00	0.0457	-	-	288 B

Exists	Job-JWWACV	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	621.7 ns	6.35 ns	5.94 ns	619.3 ns	615.4 ns	630.8 ns	1.01	Same	0.01	-	-	-	-
Exists	Job-AHMTWF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	617.7 ns	4.97 ns	4.41 ns	617.4 ns	609.9 ns	627.3 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-JWWACV	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,461,539.9 ns	19,778.91 ns	18,501.20 ns	3,458,100.0 ns	3,438,839.7 ns	3,491,215.1 ns	1.03	Same	0.01	136.9863	-	-	872,322 B
EnumerateFiles	Job-AHMTWF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,357,044.1 ns	22,147.34 ns	17,291.18 ns	3,364,237.5 ns	3,323,487.5 ns	3,373,929.7 ns	1.00	Base	0.00	125.0000	-	-	872,324 B

RecursiveCreateDeleteDirectory	Job-JWWACV	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	373,480.3 ns	6,013.38 ns	5,021.44 ns	372,166.6 ns	365,819.6 ns	385,601.3 ns	1.01	Same	0.02	1.4728	-	-	9,556 B
RecursiveCreateDeleteDirectory	Job-AHMTWF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	369,102.5 ns	3,437.55 ns	2,870.51 ns	368,691.5 ns	363,317.7 ns	373,402.4 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-JWWACV	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,117,220.3 ns	40,992.42 ns	34,230.53 ns	4,129,141.0 ns	4,046,865.6 ns	4,166,032.8 ns	1.02	Same	0.01	32.7869	16.3934	-	249,588 B
RecursiveCreateDeleteDirectory	Job-AHMTWF	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	4,048,455.6 ns	35,802.22 ns	27,952.02 ns	4,054,967.5 ns	3,989,176.7 ns	4,103,521.7 ns	1.00	Base	0.00	33.3333	16.6667	-	237,358 B

carlossanlop · 2021-05-07T01:58:55Z

Ping @Jozkee @adamsitnik - I have addressed the latest feedback, including some I received from David in our last call.

iSazonov

LGTM (with fundamental design questions as discussed).

src/libraries/System.IO.FileSystem/src/System/IO/FileStatus.Unix.cs

src/libraries/System.IO.FileSystem/tests/Enumeration/AttributeTests.cs

src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEntry.Unix.cs

src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEnumerator.Unix.cs

src/libraries/System.IO.FileSystem/src/System/IO/FileStatus.Unix.cs

…HiddenFlag.

…conditions: symlink and unknown, so use else if.

…ed and could cause unnecessary disk hit.

…ialize if in AttributesToSkip we are going to retrieve it anyway with a disk hit. Only in the case of DT_UNKNOWN, we will pre-retrieve the file cache, but we only need it when ShouldSkip is checked, and in that case, we won't have a disk hit.

src/libraries/System.IO.FileSystem/src/System/IO/FileStatus.Unix.cs

carlossanlop · 2021-05-07T23:14:14Z

@Jozkee Benchmark results for commit 7f6cee4 :

/home/carlos/.dotnet/dotnet run \
    --project /home/carlos/performance/src/benchmarks/micro/MicroBenchmarks.csproj \
    -c Release \
    -f net6.0 \
    --artifacts /home/carlos/perf_together \
    --coreRun \
            /home/carlos/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun \
            /home/carlos/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun \
    --cli /home/carlos/.dotnet/dotnet \
    --statisticalTest 3ms \
    --filter System.IO.Tests.Perf_Directory* \
    --MinIterationCount 100 \
    --MaxIterationCount 101

Method	Job	Toolchain	UnrollFactor	depth	Mean	Error	StdDev	Median	Min	Max	Ratio	MannWhitney(3ms)	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
CreateDirectory	Job-RKWOHL	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	18,947.3 ns	373.06 ns	1,076.36 ns	18,625.0 ns	17,440.0 ns	21,890.0 ns	1.00	Same	0.07	-	-	-	513 B
CreateDirectory	Job-SJWGTR	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	1	?	19,071.0 ns	313.06 ns	888.09 ns	18,830.0 ns	17,850.0 ns	22,030.0 ns	1.00	Base	0.00	-	-	-	377 B

GetCurrentDirectory	Job-MUHPJU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	588.0 ns	7.98 ns	23.53 ns	589.9 ns	556.3 ns	651.6 ns	0.96	Same	0.04	0.0443	-	-	288 B
GetCurrentDirectory	Job-MYGPKW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	613.0 ns	2.00 ns	5.73 ns	613.4 ns	599.7 ns	629.0 ns	1.00	Base	0.00	0.0435	-	-	288 B

Exists	Job-MUHPJU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	620.1 ns	1.41 ns	3.88 ns	619.7 ns	611.7 ns	630.1 ns	1.00	Same	0.01	-	-	-	-
Exists	Job-MYGPKW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	619.9 ns	1.01 ns	2.92 ns	619.9 ns	612.6 ns	625.0 ns	1.00	Base	0.00	-	-	-	-

EnumerateFiles	Job-MUHPJU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,436,544.9 ns	16,315.37 ns	46,548.66 ns	3,441,405.6 ns	3,229,990.6 ns	3,530,718.1 ns	1.03	Same	0.02	137.5000	-	-	872,321 B
EnumerateFiles	Job-MYGPKW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	?	3,341,357.5 ns	19,165.26 ns	54,368.65 ns	3,354,962.5 ns	3,179,592.5 ns	3,432,500.0 ns	1.00	Base	0.00	137.5000	-	-	872,321 B

RecursiveCreateDeleteDirectory	Job-MUHPJU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	363,536.4 ns	1,309.83 ns	3,715.77 ns	363,658.3 ns	350,198.1 ns	370,924.1 ns	0.99	Same	0.01	1.4881	-	-	9,745 B
RecursiveCreateDeleteDirectory	Job-MYGPKW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	10	366,448.3 ns	1,453.76 ns	4,052.49 ns	367,211.2 ns	354,062.9 ns	374,556.9 ns	1.00	Base	0.00	-	-	-	8,113 B

RecursiveCreateDeleteDirectory	Job-MUHPJU	/runtime/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,931,197.8 ns	15,250.87 ns	43,264.19 ns	3,924,756.2 ns	3,801,907.8 ns	4,037,179.7 ns	1.00	Same	0.02	31.2500	15.6250	-	251,219 B
RecursiveCreateDeleteDirectory	Job-MYGPKW	/runtime_base/artifacts/bin/testhost/net6.0-Linux-Release-x64/shared/Microsoft.NETCore.App/6.0.0/corerun	16	100	3,927,164.2 ns	12,361.81 ns	34,459.78 ns	3,931,016.9 ns	3,824,054.8 ns	4,020,066.1 ns	1.00	Base	0.00	32.2581	16.1290	-	237,348 B

Jozkee · 2021-05-08T00:47:11Z

src/libraries/System.IO.FileSystem/src/System/IO/FileStatus.Unix.cs

+            // Avoid disk hit first
+            if (IsNameHidden(fileName))
            {
-                // Others permissions
-                readBit = Interop.Sys.Permissions.S_IROTH;
-                writeBit = Interop.Sys.Permissions.S_IWOTH;
+                return true;
            }
-#endif
+            EnsureCachesInitialized(path, continueOnError);
+            return HasHiddenFlag;
+        }


IIRC you mentioned that UF_HIDDEN is only effective in OSX, if so we should consider splitting this implementation and optimize Unix by avoiding the native call.

Jozkee

LGTM, thanks.

iSazonov · 2021-05-08T19:09:05Z

@carlossanlop Great work! Thanks!

carlossanlop added 2 commits May 3, 2021 21:34

Hidden and ReadOnly unit tests.

739bb27

Unix: Correctly collect ReadOnly and Hidden flags from files and dire…

3175324

…ctories.

carlossanlop added the area-System.IO label May 4, 2021

carlossanlop added this to the 6.0.0 milestone May 4, 2021

carlossanlop requested review from adamsitnik and Jozkee May 4, 2021 05:01

carlossanlop added this to In progress in System.IO - File links via automation May 4, 2021

carlossanlop self-assigned this May 4, 2021

carlossanlop commented May 4, 2021

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src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEntry.Unix.cs Outdated Show resolved Hide resolved

Remove the _initialAttributes field from FileStatus. Directly call _s…

8c23640

…tatus.GetAttributes from FileSYstemEntry.Attributes since the disk hit is necessary anyway.

carlossanlop marked this pull request as ready for review May 4, 2021 05:56

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mklement0 mentioned this pull request May 4, 2021

Get-Item ./.hidden-file fails with "Could not find item" PowerShell/PowerShell#15323

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Add API to access "extended file attributes" (xattr, EA) #49604

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carlossanlop commented May 4, 2021

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Address simplication and nullcheck suggestions

6ff6dcc

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Defering some more file checking actions to FileStatus. Addressing ac…

2423af0

…cessibility of methods/properties. Addressing suggestions.

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carlossanlop mentioned this pull request May 7, 2021

Developers using filesystem APIs find them to work well with symbolic links #51605

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4 tasks

Address feedback: Remove unnecessary asserts but document why. Remove…

7de7c4a

… struct initialization. Simplify the order in which Initialize checks for unknown and symlink and add a comment.

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src/libraries/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEnumerator.Unix.cs Outdated Show resolved Hide resolved

Cache egid and euid, and refresh should reset them

52a7b69

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carlossanlop added 7 commits May 7, 2021 14:38

Check IsNameHidden before ensuring cache initialized and checking Has…

7d9dac0

…HiddenFlag.

The ifs inside FileSystemEntry.Initialize has two mutually exclusive …

e2a05d8

…conditions: symlink and unknown, so use else if.

Use entry.IsSymbolicLink directly inside Initialize.

c7d83ed

Remove extra symlink check in FileSystemEnumerator.MoveNext, not need…

3b69e81

…ed and could cause unnecessary disk hit.

Remove unused cache checks.

3105cb8

Use HasHiddenFlag as expression body

c40386c

Jozkee reviewed May 7, 2021

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Make FileStatus.Initialize inlined in the only place where its called.

7f6cee4

carlossanlop added 2 commits May 7, 2021 17:06

EnsureCacheInitialized bring back order of conditions

c4c3682

Syntax sugar for nullable egid and euid lazy retrieval

817ca95

Jozkee reviewed May 8, 2021

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carlossanlop merged commit 6a81cfa into dotnet:main May 8, 2021

System.IO - File links automation moved this from Reviewer approved to Done May 8, 2021

carlossanlop deleted the FileAttributes branch May 8, 2021 19:07

carlossanlop mentioned this pull request May 14, 2021

Some filesystem enumeration cases may throw if a symbolic link cycle is detected (link to itself) #52746

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Fix: FileSystemEntry.Attributes property is not correct on Unix #52235

Fix: FileSystemEntry.Attributes property is not correct on Unix #52235

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Fix: FileSystemEntry.Attributes property is not correct on Unix #52235

Fix: FileSystemEntry.Attributes property is not correct on Unix #52235

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