all: reduce init-time CPU & memory usage #26775

bradfitz · Aug 2, 2018

Tracking bug to reduce init-time CPU & memory usage.

Previously:

https://go-review.googlesource.com/c/go/+/127075 - html: lazily populate Unescape tables
https://go-review.googlesource.com/c/net/+/127275 - http2/hpack: lazily build huffman table on first use

Open:

#26752 - x/text/unicode/norm: reduce init-time memory usage

The program https://play.golang.org/p/9ervXCWzV_z is useful to find offenders:

$ go build all.go
$ GODEBUG=memprofilerate=1  ./all
346768
$ go tool pprof /tmp/all.mem.prof 
(pprof) top 50
Showing nodes accounting for 286.24kB, 88.87% of 322.09kB total
Dropped 228 nodes (cum <= 1.61kB)
Showing top 50 nodes out of 133
      flat  flat%   sum%        cum   cum%
   37.03kB 11.50% 11.50%    37.03kB 11.50%  runtime.procresize
      32kB  9.94% 21.43%       32kB  9.94%  hash/crc64.makeSlicingBy8Table
   21.39kB  6.64% 28.07%    21.39kB  6.64%  vendor/golang_org/x/text/unicode/norm.init
   19.98kB  6.20% 34.28%    19.98kB  6.20%  strings.NewReplacer
   18.95kB  5.88% 40.16%    18.97kB  5.89%  encoding/xml.init
   12.17kB  3.78% 43.94%    12.17kB  3.78%  unicode.init
   10.92kB  3.39% 47.33%    10.92kB  3.39%  regexp/syntax.appendRange
   10.61kB  3.29% 50.63%    10.61kB  3.29%  vendor/golang_org/x/net/http2/hpack.(*headerFieldTable).addEntry (inline)
   10.38kB  3.22% 53.85%    12.62kB  3.92%  sync.(*Map).LoadOrStore
    9.38kB  2.91% 56.76%     9.38kB  2.91%  runtime.malg
    9.17kB  2.85% 59.61%     9.22kB  2.86%  html/template.init
    8.70kB  2.70% 62.31%    69.47kB 21.57%  net/http.init
    6.84kB  2.12% 64.43%     6.84kB  2.12%  regexp/syntax.(*compiler).inst (inline)
    6.12kB  1.90% 66.34%    13.12kB  4.07%  runtime.allocm
    5.25kB  1.63% 67.97%     5.25kB  1.63%  math/rand.NewSource
    5.06kB  1.57% 69.54%     5.47kB  1.70%  net/http.init.0
    4.03kB  1.25% 70.79%     4.22kB  1.31%  net/http.init.2
    3.94kB  1.22% 72.01%     3.95kB  1.23%  debug/dwarf.init
    3.72kB  1.15% 73.17%     3.72kB  1.15%  errors.New
    3.62kB  1.13% 74.29%    12.13kB  3.77%  encoding/gob.validUserType
    3.62kB  1.13% 75.42%     3.62kB  1.13%  regexp/syntax.init
    2.91kB   0.9% 76.32%     2.91kB   0.9%  go/types.(*Scope).Insert
    2.70kB  0.84% 77.16%    26.97kB  8.37%  encoding/gob.init
    2.69kB  0.83% 77.99%     2.69kB  0.83%  flag.(*FlagSet).Var
    2.59kB  0.81% 78.80%     2.59kB  0.81%  net/mail.init.0
    2.25kB   0.7% 79.50%     2.25kB   0.7%  compress/flate.(*huffmanEncoder).generate
    2.25kB   0.7% 80.20%     2.25kB   0.7%  net/textproto.init.0
    2.09kB  0.65% 80.85%     2.09kB  0.65%  image/jpeg.(*huffmanLUT).init
    1.89kB  0.59% 81.43%     1.89kB  0.59%  compress/flate.newHuffmanEncoder
    1.80kB  0.56% 81.99%     1.80kB  0.56%  go/types.NewTypeName
    1.77kB  0.55% 82.54%     1.77kB  0.55%  text/template/parse.(*Tree).newText (inline)
    1.75kB  0.54% 83.08%     4.38kB  1.36%  runtime.mcommoninit
    1.66kB  0.51% 83.60%     8.84kB  2.74%  go/types.init
    1.64kB  0.51% 84.11%    28.67kB  8.90%  go/doc.init
    1.59kB  0.49% 84.60%     3.57kB  1.11%  encoding/gob.bootstrapType
    1.55kB  0.48% 85.08%     2.98kB  0.93%  net.init
    1.39kB  0.43% 85.51%    32.34kB 10.04%  go/build.init
    1.17kB  0.36% 85.88%     3.09kB  0.96%  text/template.init
    1.16kB  0.36% 86.24%     3.55kB  1.10%  encoding/gob.newTypeObject
    1.06kB  0.33% 86.57%    14.55kB  4.52%  encoding/gob.RegisterName
    1.02kB  0.32% 86.88%     4.57kB  1.42%  encoding/gob.buildTypeInfo
    0.94kB  0.29% 87.17%    21.06kB  6.54%  regexp.compile
    0.91kB  0.28% 87.45%    16.88kB  5.24%  encoding/gob.init.1
    0.75kB  0.23% 87.69%     1.84kB  0.57%  html/template.New
    0.69kB  0.21% 87.90%     2.13kB  0.66%  reflect.(*rtype).ptrTo
    0.67kB  0.21% 88.11%     7.20kB  2.24%  crypto/tls.init
    0.67kB  0.21% 88.32%    22.42kB  6.96%  vendor/golang_org/x/net/http/httpguts.init
    0.61kB  0.19% 88.51%    14.49kB  4.50%  archive/tar.init
    0.61kB  0.19% 88.70%     5.40kB  1.68%  net/http/pprof.init
    0.56kB  0.17% 88.87%     7.81kB  2.43%  runtime.systemstack

(pprof) top --cum 50
Showing nodes accounting for 222.77kB, 69.16% of 322.09kB total
Dropped 228 nodes (cum <= 1.61kB)
Showing top 50 nodes out of 133
      flat  flat%   sum%        cum   cum%
    0.09kB 0.029% 0.029%   268.74kB 83.44%  runtime.main
         0     0% 0.029%   266.68kB 82.80%  main.init
         0     0% 0.029%    70.38kB 21.85%  expvar.init
    8.70kB  2.70%  2.73%    69.47kB 21.57%  net/http.init
         0     0%  2.73%    37.41kB 11.61%  runtime.rt0_go
   37.03kB 11.50% 14.23%    37.03kB 11.50%  runtime.procresize
         0     0% 14.23%    37.03kB 11.50%  runtime.schedinit
    1.39kB  0.43% 14.66%    32.34kB 10.04%  go/build.init
         0     0% 14.66%       32kB  9.94%  hash/crc64.init
      32kB  9.94% 24.60%       32kB  9.94%  hash/crc64.makeSlicingBy8Table
    1.64kB  0.51% 25.10%    28.67kB  8.90%  go/doc.init
    2.70kB  0.84% 25.94%    26.97kB  8.37%  encoding/gob.init
    0.67kB  0.21% 26.15%    22.42kB  6.96%  vendor/golang_org/x/net/http/httpguts.init
         0     0% 26.15%    21.75kB  6.75%  vendor/golang_org/x/net/idna.init
   21.39kB  6.64% 32.79%    21.39kB  6.64%  vendor/golang_org/x/text/unicode/norm.init
         0     0% 32.79%    21.06kB  6.54%  regexp.Compile
         0     0% 32.79%    21.06kB  6.54%  regexp.MustCompile
    0.94kB  0.29% 33.09%    21.06kB  6.54%  regexp.compile
   19.98kB  6.20% 39.29%    19.98kB  6.20%  strings.NewReplacer
   18.95kB  5.88% 45.17%    18.97kB  5.89%  encoding/xml.init
    0.91kB  0.28% 45.46%    16.88kB  5.24%  encoding/gob.init.1
         0     0% 45.46%    14.55kB  4.52%  encoding/gob.Register
    1.06kB  0.33% 45.79%    14.55kB  4.52%  encoding/gob.RegisterName
         0     0% 45.79%    14.55kB  4.52%  encoding/gob.registerBasics
    0.61kB  0.19% 45.97%    14.49kB  4.50%  archive/tar.init
         0     0% 45.97%    13.70kB  4.25%  fmt.init
    6.12kB  1.90% 47.88%    13.12kB  4.07%  runtime.allocm
         0     0% 47.88%    12.72kB  3.95%  regexp/syntax.Parse
   10.38kB  3.22% 51.10%    12.62kB  3.92%  sync.(*Map).LoadOrStore
         0     0% 51.10%    12.17kB  3.78%  reflect.init
   12.17kB  3.78% 54.88%    12.17kB  3.78%  unicode.init
         0     0% 54.88%    12.13kB  3.77%  encoding/gob.userType
    3.62kB  1.13% 56.00%    12.13kB  3.77%  encoding/gob.validUserType
         0     0% 56.00%    11.94kB  3.71%  runtime.mstart
         0     0% 56.00%    11.50kB  3.57%  regexp/syntax.(*parser).parseClass
         0     0% 56.00%    11.25kB  3.49%  runtime.newm
   10.92kB  3.39% 59.39%    10.92kB  3.39%  regexp/syntax.appendRange
         0     0% 59.39%    10.81kB  3.36%  vendor/golang_org/x/net/http2/hpack.init
    0.05kB 0.015% 59.41%    10.75kB  3.34%  vendor/golang_org/x/net/http2/hpack.newStaticTable
   10.61kB  3.29% 62.70%    10.61kB  3.29%  vendor/golang_org/x/net/http2/hpack.(*headerFieldTable).addEntry (inline)
         0     0% 62.70%    10.50kB  3.26%  regexp/syntax.(*parser).parseUnicodeClass
         0     0% 62.70%    10.50kB  3.26%  regexp/syntax.appendTable
    9.38kB  2.91% 65.61%     9.38kB  2.91%  runtime.malg
    9.17kB  2.85% 68.46%     9.22kB  2.86%  html/template.init
         0     0% 68.46%     9.05kB  2.81%  go/importer.init
         0     0% 68.46%     9.05kB  2.81%  go/internal/gccgoimporter.init
    1.66kB  0.51% 68.97%     8.84kB  2.74%  go/types.init
    0.05kB 0.015% 68.99%     8.80kB  2.73%  mime/multipart.init
    0.56kB  0.17% 69.16%     7.81kB  2.43%  runtime.systemstack
         0     0% 69.16%     7.69kB  2.39%  html/template.(*Template).Parse

gopherbot · Aug 2, 2018

Change https://golang.org/cl/127655 mentions this issue: net: lazily look up the listenerBacklog value on first use

gopherbot · Aug 2, 2018

Change https://golang.org/cl/127660 mentions this issue: encoding/gob: lazily initialize registerBasics

gopherbot · Aug 2, 2018

Change https://golang.org/cl/127661 mentions this issue: strings: select Replacer algorithm and build machine lazily

gopherbot · Aug 2, 2018

Change https://golang.org/cl/127664 mentions this issue: http2: reduce init-time work & allocations

gopherbot · Aug 3, 2018

Change https://golang.org/cl/127735 mentions this issue: hash/crc64: lazily initialize slice8Tables

gopherbot · Aug 3, 2018

Change https://golang.org/cl/127736 mentions this issue: net/mail: lazily initialize dateLayouts

ysmolsky · Aug 3, 2018

Wow, that was picked up real fast by the others!

gopherbot · Aug 3, 2018

Change https://golang.org/cl/127875 mentions this issue: go/doc: compile regexps lazily

josharian · Aug 5, 2018

See also my last comment in #2559 about using go generate for some of this.

gopherbot · Aug 21, 2018

Change https://golang.org/cl/119715 mentions this issue: encoding/json: change reflect.Type usage to be more idiomatic

mark-rushakoff · Aug 21, 2018

Using all.go that Brad posted in the OP, and using go version devel +aa311fecda Tue Aug 21 22:11:05 2018 +0000 darwin/amd64, here are the current results:

$ gotip build all.go
$ GODEBUG=memprofilerate=1  ./all
278848
$ gotip tool pprof /tmp/all.mem.prof
Type: inuse_space
Time: Aug 21, 2018 at 3:15pm (PDT)
Entering interactive mode (type "help" for commands, "o" for options)
(pprof) top 50
Showing nodes accounting for 228.01kB, 87.93% of 259.32kB total
Dropped 218 nodes (cum <= 1.30kB)
Showing top 50 nodes out of 139
      flat  flat%   sum%        cum   cum%
   37.03kB 14.28% 14.28%    37.03kB 14.28%  runtime.procresize
   21.39kB  8.25% 22.53%    21.39kB  8.25%  vendor/golang_org/x/text/unicode/norm.init
   18.95kB  7.31% 29.84%    18.97kB  7.31%  encoding/xml.init
   12.17kB  4.69% 34.53%    12.17kB  4.69%  unicode.init
   10.81kB  4.17% 38.70%    10.81kB  4.17%  vendor/golang_org/x/net/http2/hpack.(*headerFieldTable).addEntry (inline)
   10.58kB  4.08% 42.78%    12.82kB  4.94%  sync.(*Map).LoadOrStore
    9.17kB  3.54% 46.32%     9.22kB  3.55%  html/template.init
       9kB  3.47% 49.79%        9kB  3.47%  runtime.malg
    8.70kB  3.36% 53.14%    56.52kB 21.79%  net/http.init
       7kB  2.70% 55.84%       14kB  5.40%  runtime.allocm
    6.03kB  2.33% 58.17%     6.03kB  2.33%  syscall.copyenv
    5.25kB  2.02% 60.19%     5.25kB  2.02%  math/rand.NewSource
    4.78kB  1.84% 62.04%     5.19kB  2.00%  net/http.init.0
    4.03kB  1.55% 63.59%     4.22kB  1.63%  net/http.init.2
    3.94kB  1.52% 65.11%     3.95kB  1.52%  debug/dwarf.init
    3.81kB  1.47% 66.58%     3.81kB  1.47%  errors.New
    3.62kB  1.40% 67.98%    12.34kB  4.76%  encoding/gob.validUserType
    3.62kB  1.40% 69.38%     3.62kB  1.40%  regexp/syntax.init
    2.91kB  1.12% 70.50%     2.91kB  1.12%  go/types.(*Scope).Insert
    2.70kB  1.04% 71.54%    27.16kB 10.47%  encoding/gob.init
    2.69kB  1.04% 72.58%     2.69kB  1.04%  flag.(*FlagSet).Var
    2.59kB  1.00% 73.58%     2.59kB  1.00%  net/mail.init.0
    2.25kB  0.87% 74.44%     2.25kB  0.87%  compress/flate.(*huffmanEncoder).generate
    2.25kB  0.87% 75.31%     2.25kB  0.87%  net/textproto.init.0
    2.09kB  0.81% 76.12%     2.09kB  0.81%  image/jpeg.(*huffmanLUT).init
    1.89kB  0.73% 76.85%     1.89kB  0.73%  compress/flate.newHuffmanEncoder
    1.80kB  0.69% 77.54%     1.80kB  0.69%  go/types.NewTypeName
    1.77kB  0.68% 78.22%     1.77kB  0.68%  text/template/parse.(*Tree).newText
    1.75kB  0.67% 78.90%     4.38kB  1.69%  runtime.mcommoninit
    1.66kB  0.64% 79.53%     8.85kB  3.41%  go/types.init
    1.64kB  0.63% 80.17%    10.17kB  3.92%  go/doc.init
    1.59kB  0.61% 80.78%     3.74kB  1.44%  encoding/gob.bootstrapType
    1.56kB   0.6% 81.38%     1.56kB   0.6%  regexp/syntax.(*compiler).inst (inline)
    1.55kB   0.6% 81.98%     4.02kB  1.55%  net.init
    1.41kB  0.54% 82.52%     1.41kB  0.54%  go/types.newBuiltin (inline)
    1.39kB  0.54% 83.06%    13.84kB  5.34%  go/build.init
    1.38kB  0.53% 83.59%     1.38kB  0.53%  text/template.addValueFuncs
    1.31kB  0.51% 84.10%     1.31kB  0.51%  text/template/parse.(*Tree).newPipeline
    1.17kB  0.45% 84.55%     3.09kB  1.19%  text/template.init
    1.16kB  0.45% 85.00%     3.74kB  1.44%  encoding/gob.newTypeObject
    1.06kB  0.41% 85.41%    14.55kB  5.61%  encoding/gob.RegisterName
    1.02kB  0.39% 85.80%     4.76kB  1.83%  encoding/gob.buildTypeInfo
    0.75kB  0.29% 86.09%     1.84kB  0.71%  html/template.New
    0.75kB  0.29% 86.38%     7.88kB  3.04%  runtime.systemstack
    0.73kB  0.28% 86.66%    16.71kB  6.44%  encoding/gob.init.1
    0.69kB  0.27% 86.92%     2.13kB  0.82%  reflect.(*rtype).ptrTo
    0.67kB  0.26% 87.18%     6.92kB  2.67%  crypto/tls.init
    0.67kB  0.26% 87.44%    22.42kB  8.65%  vendor/golang_org/x/net/http/httpguts.init
    0.64kB  0.25% 87.69%     1.42kB  0.55%  net/http/cgi.init
    0.61kB  0.23% 87.93%    20.99kB  8.10%  archive/tar.init
(pprof) top --cum 50
Showing nodes accounting for 160.47kB, 61.88% of 259.32kB total
Dropped 218 nodes (cum <= 1.30kB)
Showing top 50 nodes out of 139
      flat  flat%   sum%        cum   cum%
    0.09kB 0.036% 0.036%   205.41kB 79.21%  runtime.main
         0     0% 0.036%   203.23kB 78.37%  main.init
         0     0% 0.036%    57.42kB 22.14%  expvar.init
    8.70kB  3.36%  3.39%    56.52kB 21.79%  net/http.init
         0     0%  3.39%    37.41kB 14.42%  runtime.rt0_go
   37.03kB 14.28% 17.67%    37.03kB 14.28%  runtime.procresize
         0     0% 17.67%    37.03kB 14.28%  runtime.schedinit
    2.70kB  1.04% 18.71%    27.16kB 10.47%  encoding/gob.init
    0.67kB  0.26% 18.97%    22.42kB  8.65%  vendor/golang_org/x/net/http/httpguts.init
         0     0% 18.97%    21.75kB  8.39%  vendor/golang_org/x/net/idna.init
   21.39kB  8.25% 27.22%    21.39kB  8.25%  vendor/golang_org/x/text/unicode/norm.init
    0.61kB  0.23% 27.46%    20.99kB  8.10%  archive/tar.init
         0     0% 27.46%    20.20kB  7.79%  fmt.init
   18.95kB  7.31% 34.77%    18.97kB  7.31%  encoding/xml.init
    0.73kB  0.28% 35.05%    16.71kB  6.44%  encoding/gob.init.1
         0     0% 35.05%    14.55kB  5.61%  encoding/gob.Register
    1.06kB  0.41% 35.46%    14.55kB  5.61%  encoding/gob.RegisterName
         0     0% 35.46%    14.55kB  5.61%  encoding/gob.registerBasics
       7kB  2.70% 38.16%       14kB  5.40%  runtime.allocm
    1.39kB  0.54% 38.69%    13.84kB  5.34%  go/build.init
   10.58kB  4.08% 42.77%    12.82kB  4.94%  sync.(*Map).LoadOrStore
         0     0% 42.77%    12.34kB  4.76%  encoding/gob.userType
    3.62kB  1.40% 44.17%    12.34kB  4.76%  encoding/gob.validUserType
         0     0% 44.17%    12.17kB  4.69%  reflect.init
   12.17kB  4.69% 48.87%    12.17kB  4.69%  unicode.init
         0     0% 48.87%       12kB  4.63%  runtime.newm
         0     0% 48.87%    11.02kB  4.25%  vendor/golang_org/x/net/http2/hpack.init
    0.05kB 0.018% 48.88%    10.95kB  4.22%  vendor/golang_org/x/net/http2/hpack.newStaticTable
   10.81kB  4.17% 53.05%    10.81kB  4.17%  vendor/golang_org/x/net/http2/hpack.(*headerFieldTable).addEntry (inline)
         0     0% 53.05%    10.25kB  3.95%  runtime.mstart
    1.64kB  0.63% 53.69%    10.17kB  3.92%  go/doc.init
    9.17kB  3.54% 57.22%     9.22kB  3.55%  html/template.init
         0     0% 57.22%     9.07kB  3.50%  go/importer.init
         0     0% 57.22%     9.07kB  3.50%  go/internal/gccgoimporter.init
       9kB  3.47% 60.69%        9kB  3.47%  runtime.malg
    1.66kB  0.64% 61.33%     8.85kB  3.41%  go/types.init
         0     0% 61.33%        8kB  3.08%  runtime.startm
    0.75kB  0.29% 61.62%     7.88kB  3.04%  runtime.systemstack
         0     0% 61.62%     7.82kB  3.02%  os.init
         0     0% 61.62%     7.80kB  3.01%  html/template.(*Template).Parse
         0     0% 61.62%     7.80kB  3.01%  text/template.(*Template).Parse
         0     0% 61.62%     7.39kB  2.85%  text/template/parse.Parse
         0     0% 61.62%     7.04kB  2.71%  go/types.init.0
    0.67kB  0.26% 61.88%     6.92kB  2.67%  crypto/tls.init
         0     0% 61.88%     6.89kB  2.66%  text/template/parse.(*Tree).Parse
         0     0% 61.88%     6.89kB  2.66%  text/template/parse.(*Tree).parse
         0     0% 61.88%     6.52kB  2.51%  text/template/parse.(*Tree).textOrAction
         0     0% 61.88%     6.16kB  2.37%  crypto/x509.init
         0     0% 61.88%     6.05kB  2.33%  os.Getwd
         0     0% 61.88%     6.03kB  2.33%  os.Getenv

bradfitz · Aug 21, 2018

Those top two vendor/golang_org/x ones fixed in x/ but need to be imported into std. That'll happen soon enough.

gopherbot · Mar 9, 2019

Change https://golang.org/cl/166459 mentions this issue: cmd/go: further reduce init work

gopherbot · Apr 1, 2019

Change https://golang.org/cl/170317 mentions this issue: net/textproto: simplify commonHeader initialization

bradfitz added the Performance label Aug 2, 2018

bradfitz added this to the Unplanned milestone Aug 2, 2018

bradfitz added the help wanted label Aug 2, 2018

zegl added a commit to zegl/go that referenced this issue Aug 2, 2018

encoding/gob: lazily initialize registerBasics
Defer call to registerBasics until the first invocation of NewDecoder() or NewEncoder() This saves ~13.5kB of allocation in init() Updates golang#26775

f2e8552

zegl referenced this issue Aug 2, 2018
Closed
encoding/gob: lazily initialize registerBasics #26777

bradfitz referenced this issue Aug 3, 2018
Open
cmd/compile: static init maps should never generate code #2559

gopherbot referenced this issue Aug 20, 2018
Open
cmd/stringer: add the ability to optionally generate TypeFromString function #46

iand referenced this issue Oct 10, 2018
Open
encoding/xml: update character ranges for names to fifth edition (2008) specification #28124

mark-rushakoff referenced this issue Dec 21, 2018
Closed
cmd/go: `go env GOMOD` is too slow for use in interactive commands #29382

esote referenced this issue May 9, 2019
Closed
net: Moving listenerBacklog from init interferes with use of OpenBSD's pledge syscall #31927

golang/go

Track tasks and feature requests

all: reduce init-time CPU & memory usage #26775

Comments

bradfitz commented Aug 2, 2018 • edited

bradfitz added the Performance label Aug 2, 2018

bradfitz added this to the Unplanned milestone Aug 2, 2018

bradfitz added the help wanted label Aug 2, 2018

This comment has been minimized.

gopherbot commented Aug 2, 2018

zegl added a commit to zegl/go that referenced this issue Aug 2, 2018

zegl referenced this issue Aug 2, 2018

encoding/gob: lazily initialize registerBasics #26777

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bradfitz referenced this issue Aug 3, 2018

cmd/compile: static init maps should never generate code #2559

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cmd/stringer: add the ability to optionally generate TypeFromString function #46

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iand referenced this issue Oct 10, 2018

encoding/xml: update character ranges for names to fifth edition (2008) specification #28124

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cmd/go: `go env GOMOD` is too slow for use in interactive commands #29382

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esote referenced this issue May 9, 2019

net: Moving listenerBacklog from init interferes with use of OpenBSD's pledge syscall #31927

bradfitz commented Aug 2, 2018 •

edited