64 lines
1.2 KiB
Go
64 lines
1.2 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/.
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"runtime"
|
|
"runtime/pprof"
|
|
"strconv"
|
|
"syscall"
|
|
"time"
|
|
)
|
|
|
|
func init() {
|
|
if innerProcess && os.Getenv("STHEAPPROFILE") != "" {
|
|
rate := 1
|
|
if i, err := strconv.Atoi(os.Getenv("STHEAPPROFILE")); err == nil {
|
|
rate = i
|
|
}
|
|
l.Debugln("Starting heap profiling")
|
|
go saveHeapProfiles(rate)
|
|
}
|
|
}
|
|
|
|
func saveHeapProfiles(rate int) {
|
|
runtime.MemProfileRate = rate
|
|
var memstats, prevMemstats runtime.MemStats
|
|
|
|
name := fmt.Sprintf("heap-%05d.pprof", syscall.Getpid())
|
|
for {
|
|
runtime.ReadMemStats(&memstats)
|
|
|
|
if memstats.HeapInuse > prevMemstats.HeapInuse {
|
|
fd, err := os.Create(name + ".tmp")
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
err = pprof.WriteHeapProfile(fd)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
err = fd.Close()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
_ = os.Remove(name) // Error deliberately ignored
|
|
err = os.Rename(name+".tmp", name)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
prevMemstats = memstats
|
|
}
|
|
|
|
time.Sleep(250 * time.Millisecond)
|
|
}
|
|
}
|