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cmd/go: scale go list with GOMAXPROCS

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Benchmark from the go-list-benchmark branch shows the following result:

goos: darwin
goarch: arm64
pkg: cmd/go
cpu: Apple M1 Max
                     │   old.txt   │               new.txt               │
                     │   sec/op    │   sec/op     vs base                │
ListModules/Empty-10   7.768m ± 5%   7.768m ± 6%        ~ (p=0.989 n=20)
ListModules/Cmd-10     272.3m ± 2%   137.8m ± 2%  -49.40% (p=0.000 n=20)
ListModules/K8S-10     10.741 ± 2%    2.525 ± 5%  -76.49% (p=0.000 n=20)
geomean                283.2m        139.3m       -50.82%

                     │   old.txt    │               new.txt               │
                     │  sys-sec/op  │  sys-sec/op   vs base               │
ListModules/Empty-10   2.380m ±  9%   2.443m ±  9%       ~ (p=0.314 n=20)
ListModules/Cmd-10     51.84m ± 13%   47.27m ± 14%       ~ (p=0.289 n=20)
ListModules/K8S-10      1.660 ±  8%    1.485 ± 28%       ~ (p=0.512 n=20)
geomean                58.95m         55.56m        -5.75%

                     │   old.txt    │               new.txt                │
                     │ user-sec/op  │ user-sec/op   vs base                │
ListModules/Empty-10   3.034m ±  4%   3.053m ±  3%        ~ (p=0.445 n=20)
ListModules/Cmd-10     18.01m ± 11%   15.39m ±  5%  -14.55% (p=0.000 n=20)
ListModules/K8S-10     407.6m ± 11%   209.2m ± 49%  -48.67% (p=0.000 n=20)
geomean                28.13m         21.42m        -23.86%

Fixes #63136
This commit is contained in:
goto1134 2023-09-21 09:47:30 +02:00
parent 5de9811f37
commit eba40c944e
No known key found for this signature in database
1 changed files with 15 additions and 4 deletions
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19
src/cmd/go/internal/modload/list.go
View File

@ -21,6 +21,7 @@ import (
"cmd/go/internal/modfetch/codehost"
"cmd/go/internal/modinfo"
"cmd/go/internal/search"
"cmd/internal/par"
"cmd/internal/pkgpattern"
"golang.org/x/mod/module"
@ -273,19 +274,29 @@ func listModules(ctx context.Context, rs *Requirements, args []string, mode List
continue
}
matched := false
var matches []module.Version
for _, m := range mg.BuildList() {
if match(m.Path) {
matched = true
if !matchedModule[m] {
matchedModule[m] = true
mods = append(mods, moduleInfo(ctx, rs, m, mode, reuse))
matches = append(matches, m)
}
}
}
if !matched {
if len(matches) == 0 {
fmt.Fprintf(os.Stderr, "warning: pattern %q matched no module dependencies\n", arg)
}
q := par.NewQueue(runtime.GOMAXPROCS(0))
fetchedMods := make([]*modinfo.ModulePublic, len(matches))
for i, m := range matches {
q.Add(func() {
fetchedMods[i] = moduleInfo(ctx, rs, m, mode, reuse)
})
}
<-q.Idle()
mods = append(mods, fetchedMods...)
}
return rs, mods, mgErr