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