2014-08-12 13:53:24 +02:00
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// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
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// All rights reserved. Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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2014-07-23 13:17:34 +02:00
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package main
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import (
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"fmt"
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"os"
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"runtime"
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"syscall"
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"time"
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)
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func init() {
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2014-08-13 14:38:23 +02:00
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if os.Getenv("STPERFSTATS") != "" {
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go savePerfStats(fmt.Sprintf("perfstats-%d.csv", syscall.Getpid()))
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}
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2014-07-23 13:17:34 +02:00
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}
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func savePerfStats(file string) {
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fd, err := os.Create(file)
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if err != nil {
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panic(err)
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}
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var prevUsage int64
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var prevTime int64
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var rusage syscall.Rusage
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var memstats runtime.MemStats
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t0 := time.Now()
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for t := range time.NewTicker(250 * time.Millisecond).C {
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syscall.Getrusage(syscall.RUSAGE_SELF, &rusage)
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curTime := time.Now().UnixNano()
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timeDiff := curTime - prevTime
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curUsage := rusage.Utime.Nano() + rusage.Stime.Nano()
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usageDiff := curUsage - prevUsage
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cpuUsagePercent := 100 * float64(usageDiff) / float64(timeDiff)
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prevTime = curTime
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prevUsage = curUsage
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runtime.ReadMemStats(&memstats)
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startms := int(t.Sub(t0).Seconds() * 1000)
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2014-08-11 22:10:15 +02:00
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fmt.Fprintf(fd, "%d\t%f\t%d\t%d\n", startms, cpuUsagePercent, memstats.Alloc, memstats.Sys-memstats.HeapReleased)
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2014-07-23 13:17:34 +02:00
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}
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}
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