Intrinsicify JsonReaderHelper.IndexOfOrLessThan #40877

benaadams · 2020-08-15T05:54:21Z

Update to use newer Sse2, Axv2 intrinsics; and add ARM as per the method it mimics (with changes) from SpanHelpers
Also add size optimization/simplification for wasm

x64 performance changes (up to +20% improvement)

better: 30, geomean: 1.113
worse: 1, geomean: 1.066
total diff: 31

| Slower                                                                           | diff/base | Base Median (ns) | Diff Median (ns) | Modality|
| -------------------------------------------------------------------------------- | ---------:| ----------------:| ----------------:| --------:|
| System.Text.Json.Serialization.Tests.ReadJson<SimpleStructWithProperties>.Deseri |      1.07 |           288.23 |           307.28 |         |

| Faster                                                                           | base/diff | Base Median (ns) | Diff Median (ns) | Modality|
| -------------------------------------------------------------------------------- | ---------:| ----------------:| ----------------:| --------:|
| System.Text.Json.Serialization.Tests.ReadJson<Dictionary<String, String>>.Deseri |      1.22 |         22031.18 |         18102.24 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Dictionary<String, String>>.Deseri |      1.20 |         21554.46 |         17944.26 |         |
| System.Text.Json.Serialization.Tests.ReadJson<MyEventsListerViewModel>.Deseriali |      1.20 |        341085.15 |        284277.87 |         |
| System.Text.Json.Serialization.Tests.ReadJson<IndexViewModel>.DeserializeFromUtf |      1.19 |         29706.85 |         24903.98 |         |
| System.Text.Json.Serialization.Tests.ReadJson<MyEventsListerViewModel>.Deseriali |      1.19 |        330481.64 |        277947.73 |         |
| System.Text.Json.Serialization.Tests.ReadJson<MyEventsListerViewModel>.Deseriali |      1.19 |        399397.91 |        336085.63 |         |
| System.Text.Json.Serialization.Tests.ReadJson<IndexViewModel>.DeserializeFromStr |      1.18 |         31986.63 |         27064.34 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Dictionary<String, String>>.Deseri |      1.18 |         23919.94 |         20268.43 |         |
| System.Text.Json.Serialization.Tests.ReadJson<IndexViewModel>.DeserializeFromStr |      1.18 |         31000.14 |         26348.41 |         |
| System.Text.Json.Serialization.Tests.ReadJson<LoginViewModel>.DeserializeFromStr |      1.15 |           522.04 |           454.92 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Hashtable>.DeserializeFromUtf8Byte |      1.12 |         68993.04 |         61636.12 |         |
| System.Text.Json.Serialization.Tests.ReadJson<HashSet<String>>.DeserializeFromUt |      1.10 |         12663.49 |         11477.42 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableSortedDictionary<String,  |      1.10 |         78887.97 |         71927.75 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Hashtable>.DeserializeFromStream   |      1.10 |         69968.66 |         63797.29 |         |
| System.Text.Json.Serialization.Tests.ReadJson<LoginViewModel>.DeserializeFromStr |      1.09 |           763.93 |           698.34 |         |
| System.Text.Json.Serialization.Tests.ReadJson<HashSet<String>>.DeserializeFromSt |      1.09 |         12745.33 |         11734.38 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableDictionary<String, String |      1.09 |         48372.57 |         44572.25 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ArrayList>.DeserializeFromStream   |      1.09 |         51673.60 |         47617.28 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableDictionary<String, String |      1.08 |         51226.78 |         47249.65 |         |
| System.Text.Json.Serialization.Tests.ReadJson<HashSet<String>>.DeserializeFromSt |      1.08 |         13979.59 |         12973.07 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableDictionary<String, String |      1.08 |         48102.61 |         44652.30 |         |
| System.Text.Json.Serialization.Tests.ReadJson<BinaryData>.DeserializeFromStream  |      1.07 |           807.95 |           755.26 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ArrayList>.DeserializeFromString   |      1.07 |         49947.46 |         46735.64 |         |
| System.Text.Json.Serialization.Tests.ReadJson<BinaryData>.DeserializeFromUtf8Byt |      1.07 |           488.59 |           458.07 |         |
| System.Text.Json.Serialization.Tests.ReadJson<LoginViewModel>.DeserializeFromUtf |      1.06 |           426.56 |           400.78 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableSortedDictionary<String,  |      1.06 |         78155.94 |         73498.13 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Hashtable>.DeserializeFromString   |      1.06 |         67906.38 |         63896.07 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ArrayList>.DeserializeFromUtf8Byte |      1.06 |         50083.93 |         47157.52 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableSortedDictionary<String,  |      1.05 |         73213.63 |         69703.93 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Int32>.DeserializeFromUtf8Bytes    |      1.03 |            90.42 |            87.57 |         |

/cc @kunalspathak @jeffhandley for the intrinsics

src/libraries/System.Text.Json/src/System/Text/Json/Reader/JsonReaderHelper.cs

gfoidl · 2020-08-15T09:12:30Z

src/libraries/System.Text.Json/src/System/Text/Json/Reader/JsonReaderHelper.cs

+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static ref byte AddByteOffset(ref byte start, nuint offset)


For the following methods I see this pattern quite often. Maybe it's time to make these a public api?

Yeah, they're still easy to type helpers, but repeated often enough. Furthermore there could be asserts that the reads are within bounds, etc.

Most similar issue I've found is #36182

src/libraries/System.Text.Json/src/System.Text.Json.csproj

benaadams · 2020-08-17T01:50:19Z

better: 30, geomean: 1.113
worse: 1, geomean: 1.066
total diff: 31

| Slower                                                                           | diff/base | Base Median (ns) | Diff Median (ns) | Modality|
| -------------------------------------------------------------------------------- | ---------:| ----------------:| ----------------:| --------:|
| System.Text.Json.Serialization.Tests.ReadJson<SimpleStructWithProperties>.Deseri |      1.07 |           288.23 |           307.28 |         |

| Faster                                                                           | base/diff | Base Median (ns) | Diff Median (ns) | Modality|
| -------------------------------------------------------------------------------- | ---------:| ----------------:| ----------------:| --------:|
| System.Text.Json.Serialization.Tests.ReadJson<Dictionary<String, String>>.Deseri |      1.22 |         22031.18 |         18102.24 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Dictionary<String, String>>.Deseri |      1.20 |         21554.46 |         17944.26 |         |
| System.Text.Json.Serialization.Tests.ReadJson<MyEventsListerViewModel>.Deseriali |      1.20 |        341085.15 |        284277.87 |         |
| System.Text.Json.Serialization.Tests.ReadJson<IndexViewModel>.DeserializeFromUtf |      1.19 |         29706.85 |         24903.98 |         |
| System.Text.Json.Serialization.Tests.ReadJson<MyEventsListerViewModel>.Deseriali |      1.19 |        330481.64 |        277947.73 |         |
| System.Text.Json.Serialization.Tests.ReadJson<MyEventsListerViewModel>.Deseriali |      1.19 |        399397.91 |        336085.63 |         |
| System.Text.Json.Serialization.Tests.ReadJson<IndexViewModel>.DeserializeFromStr |      1.18 |         31986.63 |         27064.34 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Dictionary<String, String>>.Deseri |      1.18 |         23919.94 |         20268.43 |         |
| System.Text.Json.Serialization.Tests.ReadJson<IndexViewModel>.DeserializeFromStr |      1.18 |         31000.14 |         26348.41 |         |
| System.Text.Json.Serialization.Tests.ReadJson<LoginViewModel>.DeserializeFromStr |      1.15 |           522.04 |           454.92 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Hashtable>.DeserializeFromUtf8Byte |      1.12 |         68993.04 |         61636.12 |         |
| System.Text.Json.Serialization.Tests.ReadJson<HashSet<String>>.DeserializeFromUt |      1.10 |         12663.49 |         11477.42 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableSortedDictionary<String,  |      1.10 |         78887.97 |         71927.75 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Hashtable>.DeserializeFromStream   |      1.10 |         69968.66 |         63797.29 |         |
| System.Text.Json.Serialization.Tests.ReadJson<LoginViewModel>.DeserializeFromStr |      1.09 |           763.93 |           698.34 |         |
| System.Text.Json.Serialization.Tests.ReadJson<HashSet<String>>.DeserializeFromSt |      1.09 |         12745.33 |         11734.38 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableDictionary<String, String |      1.09 |         48372.57 |         44572.25 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ArrayList>.DeserializeFromStream   |      1.09 |         51673.60 |         47617.28 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableDictionary<String, String |      1.08 |         51226.78 |         47249.65 |         |
| System.Text.Json.Serialization.Tests.ReadJson<HashSet<String>>.DeserializeFromSt |      1.08 |         13979.59 |         12973.07 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableDictionary<String, String |      1.08 |         48102.61 |         44652.30 |         |
| System.Text.Json.Serialization.Tests.ReadJson<BinaryData>.DeserializeFromStream  |      1.07 |           807.95 |           755.26 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ArrayList>.DeserializeFromString   |      1.07 |         49947.46 |         46735.64 |         |
| System.Text.Json.Serialization.Tests.ReadJson<BinaryData>.DeserializeFromUtf8Byt |      1.07 |           488.59 |           458.07 |         |
| System.Text.Json.Serialization.Tests.ReadJson<LoginViewModel>.DeserializeFromUtf |      1.06 |           426.56 |           400.78 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableSortedDictionary<String,  |      1.06 |         78155.94 |         73498.13 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Hashtable>.DeserializeFromString   |      1.06 |         67906.38 |         63896.07 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ArrayList>.DeserializeFromUtf8Byte |      1.06 |         50083.93 |         47157.52 |         |
| System.Text.Json.Serialization.Tests.ReadJson<ImmutableSortedDictionary<String,  |      1.05 |         73213.63 |         69703.93 |         |
| System.Text.Json.Serialization.Tests.ReadJson<Int32>.DeserializeFromUtf8Bytes    |      1.03 |            90.42 |            87.57 |         |

benaadams · 2020-08-17T02:44:29Z

Libraries Test Run release coreclr OSX x64 Debug failed: AcceptV4BoundToAnyV6_Success #40913

src/libraries/System.Text.Json/src/System/Text/Json/Reader/JsonReaderHelper.SpeedOpts.cs

benaadams · 2020-08-17T03:30:51Z

src/libraries/System.Text.Json/src/System/Text/Json/Reader/JsonReaderHelper.SpeedOpts.cs

+                            // Same as method as above
+                            matches = Avx2.MoveMask(
+                                            Avx2.Or(
+                                                Avx2.CompareGreaterThan(


Note: Avx2 doesn't have less than so arguments are switched for greater than

benaadams · 2020-08-17T03:33:13Z

src/libraries/System.Text.Json/src/System/Text/Json/Reader/JsonReaderHelper.SpeedOpts.cs

+                                            Avx2.Or(
+                                                Avx2.CompareGreaterThan(
+                                                    valuesLessThan,
+                                                    Avx2.Subtract(search, Vector256.Create((byte)0x80)).AsSByte()).AsByte(),


Note: Also CompareGreaterThan is only sbyte (and CompareLessThan on Sse2), so subtract 0x80 before casting and doing the compare to keep the order correct

benaadams · 2020-08-17T21:52:56Z

Can't workout the linker test issues :(

dotnet build /t:PublishTrimmed /nr:false /warnaserror -p:configuration=Release

/Users/runner/work/1/s/.dotnet/sdk/5.0.100-preview.8.20362.3/NuGet.targets(128,5): 
Invalid restore input. Invalid target framework 'unsupported'. Input files:
 /Users/runner/work/1/s/src/libraries/System.Text.Json/src/System.Text.Json.csproj.
 [/Users/runner/work/1/s/artifacts/bin/trimmingTests/projects/Microsoft.Extensions.Logging.Console.TrimmingTests/
  AddConsoleFormatterTests/osx-x64/project.csproj] [/Users/runner/work/1/s/src/libraries/Microsoft.Extensions.Logging.Console/tests/TrimmingTests/
  Microsoft.Extensions.Logging.Console.TrimmingTests.proj]

layomia · 2020-08-19T18:13:55Z

Taking a look now.

benaadams · 2020-08-19T18:54:49Z

@layomia when I add the browser type $(NetCoreAppCurrent)-Browser to <TargetFrameworks> then the linker tests for TrimmingTests/Microsoft.Extensions.Logging.Console.TrimmingTests.proj which imports System.Text.Json start failing with

Errors
    NuGet.targets(128,5): Invalid restore input. Invalid target framework 'unsupported'. 
    Input files:  
        src/libraries/System.Text.Json/src/System.Text.Json.csproj.          
        trimmingTests/projects/Microsoft.Extensions.Logging.Console.TrimmingTests/AddConsoleFormatterTests/linux-x64/project.csproj               
        src/libraries/Microsoft.Extensions.Logging.Console/tests/TrimmingTests/Microsoft.Extensions.Logging.Console.TrimmingTests.proj

On Windows, Linux and OSX. However doesn't seem to provide much helpful detail in the binlog as to why its becoming "unsupported" :(

benaadams · 2020-08-19T19:03:12Z

So the unsupported bit is probably NuGet/Home#5413; which is what NuGet outputs for an unknown framework

benaadams · 2020-08-19T19:26:09Z

Current working idea looking at other build is need to override NuGet.targets with NuGet.RestoreEx.targets somehow

Overriding target "Restore" in project "/__w/1/s/.dotnet/sdk/5.0.100-preview.8.20362.3/NuGet.targets"
 with target "Restore" from project "/__w/1/s/.dotnet/sdk/5.0.100-preview.8.20362.3/NuGet.RestoreEx.targets"

layomia

I tried out some changes wrt wasm/non-wasm builds, pls see if this helps - layomia@137ac47. We don't run the linker tests specifically on wasm builds afaict so I don't think any linker test changes are needed in this PR.

layomia · 2020-08-19T17:56:33Z

src/libraries/System.Text.Json/src/System.Text.Json.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <TargetFrameworks>$(NetCoreAppCurrent);netstandard2.0;netcoreapp3.0;net461</TargetFrameworks>
+    <TargetFrameworks>$(NetCoreAppCurrent)-Windows_NT;$(NetCoreAppCurrent)-Unix;$(NetCoreAppCurrent)-Browser;netstandard2.0;netcoreapp3.0;net461</TargetFrameworks>


Why is this change needed?

I think it will only output an AnyCPU assembly if either the TargetFrameworks doesn't have browser or the Architectures aren't included to have wasm which will mean '$(TargetArchitecture)' == 'wasm' will never be true?

src/libraries/System.Text.Json/src/System.Text.Json.csproj

src/libraries/System.Text.Json/src/System/Text/Json/Reader/JsonReaderHelper.SpeedOpts.cs

src/libraries/System.Text.Json/src/System.Text.Json.csproj

benaadams · 2020-08-19T22:49:43Z

We don't run the linker tests specifically on wasm builds afaict so I don't think any linker test changes are needed in this PR.

So its looks like NuGet chokes on <TargetFrameworks>net5.0;net5.0-Browser;...; so the arcade build tools normalize that before restore to <TargetFrameworks>net5.0;... so NuGet doesn't fail.

However the linker tests look to shell out to a basic build which uses the standard restore causing them to fail for all frameworks (where this changed .csproj is included)

benaadams · 2020-08-20T14:59:10Z

🥳

Going to close this PR and open a fresh one as its a bit of a tire fire

benaadams · 2020-08-20T15:49:25Z

Opened #41097

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benaadams force-pushed the IndexOfOrLessThan branch from efb91b9 to 6cfe3c7 Compare August 15, 2020 05:57

benaadams changed the title ~~Intrinsicify JsonReaderHelper.IndexOfOrLessThan~~ Intrinsicify JsonReaderHelper.IndexOfOrLessThan [NoMerge] Aug 15, 2020

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benaadams requested review from jozkee, layomia and steveharter as code owners August 15, 2020 20:30

benaadams changed the title ~~Intrinsicify JsonReaderHelper.IndexOfOrLessThan [NoMerge]~~ Intrinsicify JsonReaderHelper.IndexOfOrLessThan Aug 15, 2020

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[interp] Intrinsify IndexOfOrLessThan #40705

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CI: System.ArgumentException : The supplied System.Net.Internals.SocketAddress is an invalid size for the System.Net.IPEndPoint end point. #40913

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x86, x64, ARM Intrinsicify JsonReaderHelper.IndexOfOrLessThan

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Add optimization for wasm

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Add IncludePlatformAttributes

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try adding framework

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OSX CI builds failing "Please install openssl before running this script" #41006

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multi-framework

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Try including Directory.Build.props

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Intrinsicify (Sse, Axv2, Arm64, wasm) JsonReaderHelper.IndexOfOrLessThan #41097

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Intrinsicify JsonReaderHelper.IndexOfOrLessThan #40877

Intrinsicify JsonReaderHelper.IndexOfOrLessThan #40877

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Intrinsicify JsonReaderHelper.IndexOfOrLessThan #40877

Intrinsicify JsonReaderHelper.IndexOfOrLessThan #40877

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