73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. If not, see <http://www.gnu.org/licenses/>.
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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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"runtime/pprof"
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"strconv"
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"syscall"
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"time"
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)
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func init() {
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if innerProcess && os.Getenv("STHEAPPROFILE") != "" {
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rate := 1
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if i, err := strconv.Atoi(os.Getenv("STHEAPPROFILE")); err == nil {
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rate = i
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}
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l.Debugln("Starting heap profiling")
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go saveHeapProfiles(rate)
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}
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}
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func saveHeapProfiles(rate int) {
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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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panic(err)
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}
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err = pprof.WriteHeapProfile(fd)
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if err != nil {
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panic(err)
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}
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err = fd.Close()
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if err != nil {
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panic(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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panic(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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