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$ go tool trace
 ࢖ͬͯΈΑ͏ גࣜձࣾωΫετΧϨϯγʔ @nametake

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ࣗݾ঺հ

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@nametake

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Goྺ1೥ͪΐͬͱ

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ύϑΥʔϚϯεܭଌ

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runtime/pprof net/http/pprof

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package main import ( "log" "net/http" _ "net/http/pprof" "runtime" ) func main() { runtime.SetBlockProfileRate(1) log.Println( http.ListenAndServe("0.0.0.0:6060", nil), ) }

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localhost:6060/debug/pprof/

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$ go tool trace

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࢖͍ํઆ໌

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runtime/trace

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package main import ( "os" "runtime/trace" ) func main() { f, err := os.Create("trace.out") if err != nil { panic(err) } defer f.Close() err = trace.Start(f) if err != nil { panic(err) } defer trace.Stop() }

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$ go tool trace trace.out

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ϑΝΠϧॻ͖ࠐΈ

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f, err := os.Create("test.txt") if err != nil { panic(err) } defer f.Close() for i := 0; i < 100; i++ { fmt.Fprintf(f, "line number: %d\n", i) }

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ॲཧ࣌ؒ

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ॲཧ࣌ؒ

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ϓϩάϥϜ͕֬อͨ͠ώʔϓྖҬ

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goroutineͷ਺ͱ࣮ߦ࣌ؒ

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OSͷThreadͷ਺ͱ࣮ߦ࣌ؒ

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Proc(CPU)Ͱॲཧ͍ͯ͠Δ಺༰

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ͳΜ͔৭ʑͳ৘ใ

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Goݴޠ͸ ׂΓͱؾܰʹ syscallΛݺͿ

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syscallͷݺͼग़͠

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ͱͯ΋͋΍͍͠

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syscallΛݺΜͰΔ

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f, err := os.Create("test.txt") if err != nil { panic(err) } defer f.Close() for i := 0; i < 100; i++ { fmt.Fprintf(f, "line number: %d\n", i) }

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f, err := os.Create("test.txt") if err != nil { panic(err) } defer f.Close() for i := 0; i < 100; i++ { fmt.Fprintf(f, "line number: %d\n", i) }

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bufio

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f, err := os.Create("test.txt") if err != nil { panic(err) } defer f.Close() w := bufio.NewWriter(f) defer w.Flush() for i := 0; i < 100; i++ { fmt.Fprintf(w, "line number: %d\n", i) }

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GUIͰ֬ೝग़དྷΔʂ

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GC

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GC

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GCຖʹ֬อ͠௚͍ͯ͠Δ

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n := 400000 list := []int{} for i := 0; i < n; i++ { list = append(list, i) }

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n := 400000 list := []int{} for i := 0; i < n; i++ { list = append(list, i) }

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n := 400000 list := make([]int, n) for i := 0; i < n; i++ { list[i] = i }

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GC͕ൃੜ͍ͯ͠ͳ͍

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࠷ॳʹΨοπϦྖҬ֬อ

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6ms → 2ms

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ฒྻԽ

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https://making.pusher.com/go-tool-trace/ Connʹॻ͖ࠐΈ

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https://making.pusher.com/go-tool-trace/ ͜ͷ෦෼Ͱॻ͖ࠐΜͰ͍Δ

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https://making.pusher.com/go-tool-trace/

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https://making.pusher.com/go-tool-trace/ ଞͷϓϩηε࢖ͬͯͳ͍

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https://making.pusher.com/go-tool-trace/

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https://making.pusher.com/go-tool-trace/

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https://making.pusher.com/go-tool-trace/ CPUΛແବͳ͘ར༻

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͍Ζ͍ΖΘ͔Δ

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શ෦ͷ໰୊͕ Θ͔ΔΘ͚Ͱ͸ͳ͍

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CPUͷ࢖༻཰͸ pprofͱ͔Λ ݟͨ΄͏͕͍͍

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ϓϩάϥϜͷ ྲྀΕΛ஌Δ

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ͱΓ͋͑ͣ ݟͯΈΔ͚ͩͰ΋ ͍͍͔΋

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go traceͷ͜ͱɺ ࣌ʑͰ͍͍͔Β……ɹ ࢥ͍ग़͍ͯͩ͘͠͞