61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package syncthing_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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"runtime/pprof"
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"syscall"
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"time"
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)
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func startHeapProfiler() {
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l.Debugln("Starting heap profiling")
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go func() {
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err := saveHeapProfiles(1) // Only returns on error
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l.Warnln("Heap profiler failed:", err)
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panic("Heap profiler failed")
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}()
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}
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func saveHeapProfiles(rate int) error {
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runtime.MemProfileRate = rate
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var memstats, prevMemstats runtime.MemStats
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name := fmt.Sprintf("heap-%05d.pprof", syscall.Getpid())
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for {
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runtime.ReadMemStats(&memstats)
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if memstats.HeapInuse > prevMemstats.HeapInuse {
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fd, err := os.Create(name + ".tmp")
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if err != nil {
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return err
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}
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err = pprof.WriteHeapProfile(fd)
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if err != nil {
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return err
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}
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err = fd.Close()
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if err != nil {
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return err
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}
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os.Remove(name) // Error deliberately ignored
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err = os.Rename(name+".tmp", name)
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if err != nil {
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return err
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}
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prevMemstats = memstats
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}
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time.Sleep(250 * time.Millisecond)
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}
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}
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