51 lines
1.0 KiB
Go
51 lines
1.0 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 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 init() {
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if innerProcess && os.Getenv("STBLOCKPROFILE") != "" {
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profiler := pprof.Lookup("block")
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if profiler == nil {
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panic("Couldn't find block profiler")
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}
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l.Debugln("Starting block profiling")
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go saveBlockingProfiles(profiler)
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}
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}
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func saveBlockingProfiles(profiler *pprof.Profile) {
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runtime.SetBlockProfileRate(1)
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t0 := time.Now()
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for t := range time.NewTicker(20 * time.Second).C {
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startms := int(t.Sub(t0).Seconds() * 1000)
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fd, err := os.Create(fmt.Sprintf("block-%05d-%07d.pprof", syscall.Getpid(), startms))
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if err != nil {
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panic(err)
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}
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err = profiler.WriteTo(fd, 0)
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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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}
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}
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