micro/debug/profile/pprof/pprof.go

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2020-08-07 14:18:01 +03:00
// Package pprof provides a pprof profiler which writes output to /tmp/[name].{cpu,mem}.pprof
package pprof
import (
"os"
"path/filepath"
"runtime"
"runtime/pprof"
"sync"
"time"
"github.com/unistack-org/micro/v3/debug/profile"
)
type profiler struct {
opts profile.Options
sync.Mutex
running bool
exit chan bool
// where the cpu profile is written
cpuFile *os.File
// where the mem profile is written
memFile *os.File
}
func (p *profiler) writeHeap(f *os.File) {
defer f.Close()
t := time.NewTicker(time.Second * 30)
defer t.Stop()
for {
select {
case <-t.C:
runtime.GC()
pprof.WriteHeapProfile(f)
case <-p.exit:
return
}
}
}
func (p *profiler) Start() error {
p.Lock()
defer p.Unlock()
if p.running {
return nil
}
// create exit channel
p.exit = make(chan bool)
cpuFile := filepath.Join("/tmp", "cpu.pprof")
memFile := filepath.Join("/tmp", "mem.pprof")
if len(p.opts.Name) > 0 {
cpuFile = filepath.Join("/tmp", p.opts.Name+".cpu.pprof")
memFile = filepath.Join("/tmp", p.opts.Name+".mem.pprof")
}
f1, err := os.Create(cpuFile)
if err != nil {
return err
}
f2, err := os.Create(memFile)
if err != nil {
return err
}
// start cpu profiling
if err := pprof.StartCPUProfile(f1); err != nil {
return err
}
// write the heap periodically
go p.writeHeap(f2)
// set cpu file
p.cpuFile = f1
// set mem file
p.memFile = f2
p.running = true
return nil
}
func (p *profiler) Stop() error {
p.Lock()
defer p.Unlock()
select {
case <-p.exit:
return nil
default:
close(p.exit)
pprof.StopCPUProfile()
p.cpuFile.Close()
p.running = false
p.cpuFile = nil
p.memFile = nil
return nil
}
}
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func (p *profiler) String() string {
return "pprof"
}
func NewProfile(opts ...profile.Option) profile.Profile {
var options profile.Options
for _, o := range opts {
o(&options)
}
p := new(profiler)
p.opts = options
return p
}