syncthing/cmd/syncthing/perfstats_unix.go
2017-02-09 08:04:16 +01:00

64 lines
1.6 KiB
Go

// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
// +build !solaris,!windows
package main
import (
"fmt"
"os"
"runtime"
"syscall"
"time"
"github.com/syncthing/syncthing/lib/protocol"
)
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
var prevIn, prevOut int64
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
in, out := protocol.TotalInOut()
var inRate, outRate float64
if timeDiff > 0 {
inRate = float64(in-prevIn) / (float64(timeDiff) / 1e9) // bytes per second
outRate = float64(out-prevOut) / (float64(timeDiff) / 1e9) // bytes per second
}
prevIn, prevOut = in, out
runtime.ReadMemStats(&memstats)
startms := int(t.Sub(t0).Seconds() * 1000)
fmt.Fprintf(fd, "%d\t%f\t%d\t%d\t%.0f\t%.0f\n", startms, cpuUsagePercent, memstats.Alloc, memstats.Sys-memstats.HeapReleased, inRate, outRate)
}
}