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Add comments after fixing

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This commit is contained in:
Felix Geisendörfer
2021-02-05 15:29:15 +01:00
parent 224167a80e
commit baae32d75f
1 changed files with 58 additions and 0 deletions
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58
examples/block-sample/main.go
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@ -84,3 +84,61 @@ func simulateBlockEvents(meanDuration time.Duration, done chan struct{}) error {
}
}
}
/*
Bias in current go version:
$ go version
go version go1.15.6 darwin/amd64
$ go run . && go tool pprof -raw block.pb.gz
PeriodType: contentions count
Period: 1
Time: 2021-02-05 15:27:01.371414 +0100 CET
Samples:
contentions/count delay/nanoseconds
23271 892063188: 1 2 3 4
22612 438270491: 1 2 5 4
Locations
1: 0x10453af M=1 runtime.selectgo /usr/local/Cellar/go/1.15.6/libexec/src/runtime/select.go:511 s=0
2: 0x10cf56b M=1 main.simulateBlockEvents /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:66 s=0
3: 0x10cf8b2 M=1 main.eventB /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:52 s=0
main.run.func2 /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:28 s=0
4: 0x10cefd8 M=1 golang.org/x/sync/errgroup.(*Group).Go.func1 /Users/felix.geisendoerfer/go/pkg/mod/golang.org/x/sync@v0.0.0-20201207232520-09787c993a3a/errgroup/errgroup.go:57 s=0
5: 0x10cf852 M=1 main.eventA /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:48 s=0
main.run.func1 /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:25 s=0
Mappings
1: 0x0/0x0/0x0 [FN]
After removing bias with this patch:
https://github.com/felixge/go/commit/7c3f70c378d3f9a331a2079d17cd4cc420c70190
$ sgo version
go version devel +7c3f70c378 2021-02-05 15:19:48 +0100 darwin/amd64
$ sgo run . && go tool pprof -raw block.pb.gz
PeriodType: contentions count
Period: 1
Time: 2021-02-05 15:18:56.401244 +0100 CET
Samples:
contentions/count delay/nanoseconds
22833 931500628: 1 2 3 4
22453 902100036: 1 2 5 4
1 39999: 6 7 8 9 10
Locations
1: 0x10471d9 M=1 runtime.selectgo /Users/felix.geisendoerfer/go/src/github.com/golang/go/src/runtime/select.go:492 s=0
2: 0x10d023e M=1 main.simulateBlockEvents /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:66 s=0
3: 0x10d0592 M=1 main.eventB /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:52 s=0
main.run.func2 /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:28 s=0
4: 0x10cfcd8 M=1 golang.org/x/sync/errgroup.(*Group).Go.func1 /Users/felix.geisendoerfer/go/pkg/mod/golang.org/x/sync@v0.0.0-20201207232520-09787c993a3a/errgroup/errgroup.go:57 s=0
5: 0x10d0532 M=1 main.eventA /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:48 s=0
main.run.func1 /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:25 s=0
6: 0x107b024 M=1 sync.(*WaitGroup).Wait /Users/felix.geisendoerfer/go/src/github.com/golang/go/src/sync
/waitgroup.go:130 s=0
7: 0x10cfb30 M=1 golang.org/x/sync/errgroup.(*Group).Wait /Users/felix.geisendoerfer/go/pkg/mod/golang.org/x/sync@v0.0.0-20201207232520-09787c993a3a/errgroup/errgroup.go:40 s=0
8: 0x10cff7a M=1 main.run /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:32 s=0
9: 0x10cfda5 M=1 main.main /Users/felix.geisendoerfer/go/src/github.com/felixge/go-profiler-notes/examples/block-sample/main.go:14 s=0
10: 0x10371b5 M=1 runtime.main /Users/felix.geisendoerfer/go/src/github.com/golang/go/src/runtime/proc.go:225 s=0
Mappings
1: 0x0/0x0/0x0 [FN]
*/