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profile.go
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profile.go
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// +build linux darwin
package proc
import (
"fmt"
"os"
"os/signal"
"path"
"runtime"
"runtime/pprof"
"runtime/trace"
"sync/atomic"
"syscall"
"time"
"github.com/shuguocloud/go-zero/core/logx"
)
// DefaultMemProfileRate is the default memory profiling rate.
// See also http://golang.org/pkg/runtime/#pkg-variables
const DefaultMemProfileRate = 4096
// started is non zero if a profile is running.
var started uint32
// Profile represents an active profiling session.
type Profile struct {
// closers holds cleanup functions that run after each profile
closers []func()
// stopped records if a call to profile.Stop has been made
stopped uint32
}
func (p *Profile) close() {
for _, closer := range p.closers {
closer()
}
}
func (p *Profile) startBlockProfile() {
fn := createDumpFile("block")
f, err := os.Create(fn)
if err != nil {
logx.Errorf("profile: could not create block profile %q: %v", fn, err)
return
}
runtime.SetBlockProfileRate(1)
logx.Infof("profile: block profiling enabled, %s", fn)
p.closers = append(p.closers, func() {
pprof.Lookup("block").WriteTo(f, 0)
f.Close()
runtime.SetBlockProfileRate(0)
logx.Infof("profile: block profiling disabled, %s", fn)
})
}
func (p *Profile) startCpuProfile() {
fn := createDumpFile("cpu")
f, err := os.Create(fn)
if err != nil {
logx.Errorf("profile: could not create cpu profile %q: %v", fn, err)
return
}
logx.Infof("profile: cpu profiling enabled, %s", fn)
pprof.StartCPUProfile(f)
p.closers = append(p.closers, func() {
pprof.StopCPUProfile()
f.Close()
logx.Infof("profile: cpu profiling disabled, %s", fn)
})
}
func (p *Profile) startMemProfile() {
fn := createDumpFile("mem")
f, err := os.Create(fn)
if err != nil {
logx.Errorf("profile: could not create memory profile %q: %v", fn, err)
return
}
old := runtime.MemProfileRate
runtime.MemProfileRate = DefaultMemProfileRate
logx.Infof("profile: memory profiling enabled (rate %d), %s", runtime.MemProfileRate, fn)
p.closers = append(p.closers, func() {
pprof.Lookup("heap").WriteTo(f, 0)
f.Close()
runtime.MemProfileRate = old
logx.Infof("profile: memory profiling disabled, %s", fn)
})
}
func (p *Profile) startMutexProfile() {
fn := createDumpFile("mutex")
f, err := os.Create(fn)
if err != nil {
logx.Errorf("profile: could not create mutex profile %q: %v", fn, err)
return
}
runtime.SetMutexProfileFraction(1)
logx.Infof("profile: mutex profiling enabled, %s", fn)
p.closers = append(p.closers, func() {
if mp := pprof.Lookup("mutex"); mp != nil {
mp.WriteTo(f, 0)
}
f.Close()
runtime.SetMutexProfileFraction(0)
logx.Infof("profile: mutex profiling disabled, %s", fn)
})
}
func (p *Profile) startThreadCreateProfile() {
fn := createDumpFile("threadcreate")
f, err := os.Create(fn)
if err != nil {
logx.Errorf("profile: could not create threadcreate profile %q: %v", fn, err)
return
}
logx.Infof("profile: threadcreate profiling enabled, %s", fn)
p.closers = append(p.closers, func() {
if mp := pprof.Lookup("threadcreate"); mp != nil {
mp.WriteTo(f, 0)
}
f.Close()
logx.Infof("profile: threadcreate profiling disabled, %s", fn)
})
}
func (p *Profile) startTraceProfile() {
fn := createDumpFile("trace")
f, err := os.Create(fn)
if err != nil {
logx.Errorf("profile: could not create trace output file %q: %v", fn, err)
return
}
if err := trace.Start(f); err != nil {
logx.Errorf("profile: could not start trace: %v", err)
return
}
logx.Infof("profile: trace enabled, %s", fn)
p.closers = append(p.closers, func() {
trace.Stop()
logx.Infof("profile: trace disabled, %s", fn)
})
}
// Stop stops the profile and flushes any unwritten data.
func (p *Profile) Stop() {
if !atomic.CompareAndSwapUint32(&p.stopped, 0, 1) {
// someone has already called close
return
}
p.close()
atomic.StoreUint32(&started, 0)
}
// StartProfile starts a new profiling session.
// The caller should call the Stop method on the value returned
// to cleanly stop profiling.
func StartProfile() Stopper {
if !atomic.CompareAndSwapUint32(&started, 0, 1) {
logx.Error("profile: Start() already called")
return noopStopper
}
var prof Profile
prof.startCpuProfile()
prof.startMemProfile()
prof.startMutexProfile()
prof.startBlockProfile()
prof.startTraceProfile()
prof.startThreadCreateProfile()
go func() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT)
<-c
logx.Info("profile: caught interrupt, stopping profiles")
prof.Stop()
signal.Reset()
syscall.Kill(os.Getpid(), syscall.SIGINT)
}()
return &prof
}
func createDumpFile(kind string) string {
command := path.Base(os.Args[0])
pid := syscall.Getpid()
return path.Join(os.TempDir(), fmt.Sprintf("%s-%d-%s-%s.pprof",
command, pid, kind, time.Now().Format(timeFormat)))
}