60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
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// 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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"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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