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$ go tool trace ͬͯΈΑ͏ גࣜձࣾωΫετΧϨϯγʔ @nametake
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ࣗݾհ
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@nametake
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Goྺ1ͪΐͬͱ
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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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goroutineͷͱ࣮ߦ࣌ؒ
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OSͷThreadͷͱ࣮ߦ࣌ؒ
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Proc(CPU)Ͱॲཧ͍ͯ͠Δ༰
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ͳΜ͔৭ʑͳใ
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Goݴޠ ׂΓͱؾܰʹ syscallΛݺͿ
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syscallͷݺͼग़͠
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ͱ͍ͯ͋͠
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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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GCຖʹ֬อ͍ͯ͠͠Δ
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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/ ͜ͷ෦Ͱॻ͖ࠐΜͰ͍Δ
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https://making.pusher.com/go-tool-trace/
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https://making.pusher.com/go-tool-trace/ ଞͷϓϩηεͬͯͳ͍
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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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શ෦ͷ͕ Θ͔ΔΘ͚Ͱͳ͍
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CPUͷ༻ pprofͱ͔Λ ݟͨ΄͏͕͍͍
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ϓϩάϥϜͷ ྲྀΕΛΔ
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ͱΓ͋͑ͣ ݟͯΈΔ͚ͩͰ ͍͍͔
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go traceͷ͜ͱɺ ࣌ʑͰ͍͍͔Β……ɹ ࢥ͍ग़͍ͯͩ͘͠͞