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// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
// All rights reserved. Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package main
import (
"fmt"
"os"
"runtime"
"runtime/pprof"
"syscall"
"time"
)
func init() {
if innerProcess && os.Getenv("STHEAPPROFILE") != "" {
l.Debugln("Starting heap profiling")
go saveHeapProfiles()
}
}
func saveHeapProfiles() {
runtime.MemProfileRate = 1
var memstats, prevMemstats runtime.MemStats
t0 := time.Now()
for t := range time.NewTicker(250 * time.Millisecond).C {
startms := int(t.Sub(t0).Seconds() * 1000)
runtime.ReadMemStats(&memstats)
if memstats.HeapInuse > prevMemstats.HeapInuse {
fd, err := os.Create(fmt.Sprintf("heap-%05d-%07d.pprof", syscall.Getpid(), startms))
if err != nil {
panic(err)
}
err = pprof.WriteHeapProfile(fd)
if err != nil {
panic(err)
}
err = fd.Close()
if err != nil {
panic(err)
}
prevMemstats = memstats
}
}
}
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