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Simple profiling for Go

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parsing profile: unrecognized profile format under MacOs Sierra 10.12.5

nsitbon opened this issue · comments

commented

Hi, I'm trying to profile my application using your package following the documentation.
I have a cpu.pprof non empty file generated but pprof is unable to read it

$ go tool pprof —pdf ./app /var/folders/x7/wnp2zjn563j2dr45dsfpvdz80000gn/T/profile464041113/cpu.pprof > out.pdf              nsitbon@mac-ns
parsing profile: unrecognized profile format

I've tried multiple configuration from the default one
defer profile.Start().Stop()
to a more elaborated
defer profile.Start(profile.BlockProfile, profile.MemProfile, profile.CPUProfile).Stop()
but pprof is still unable to parse it.
Any ideas?

FYI

$ go version                                                                                                                  
go version go1.8.3 darwin/amd64

Thanks

commented
commented 
$ go version                                                                                                                  
go version go1.8.3 darwin/amd64
commented

Can you please double check the versino of Go that built ./app.

https://dave.cheney.net/2017/06/20/how-to-find-out-which-go-version-built-your-binary

If that's as expected, please try this set of commands and see if it they work

go test bytes -bench=String -cpuprofile=/tmp/c.p 
go tool pprof ./bytes.test /tmp/c.p
commented
commented 
(lldb) run
Process 48238 launched: './app' (x86_64)
Process 48238 stopped
* thread #6, stop reason = breakpoint 1.1
    frame #0: 0x00000000013a6714 app`main.main at main.go:16
   13  	)
   14
   15  	func main() {
-> 16  		defer profile.Start(profile.BlockProfile, profile.MemProfile, profile.CPUProfile).Stop()
   17  		suffixRepo := suffixRepository.New()
   18  		sequenceRepo := sequenceRepository.New(getSequenceFilePath())
   19  		defer sequenceRepo.Close()
(lldb) p runtime.buildVersion
(string) runtime.buildVersion = "go1.8.3"

I tried the two commands above and it works this time.

commented
commented

Yep sure I was able to reproduce the bug with this pruned code:

package main

import (
	"github.com/pkg/profile"
	"github.com/gin-gonic/gin"
)
func main() {
	defer profile.Start().Stop()
	r := newHttpServer()
	r.Run(":8080")
}

func newHttpServer() *gin.Engine {
	r := gin.Default()
	r.GET("/admin/isHealthy", func(c *gin.Context){c.Status(200)})
	return r
}
% ~/go/bin/godep go build -o app ./main2.go
±|master ✘| identifier-generator-hp
% ./app
profile: cpu profiling enabled, /var/folders/x7/wnp2zjn563j2dr45dsfpvdz80000gn/T/profile467765493/cpu.pprof
[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
 - using env:	export GIN_MODE=release
 - using code:	gin.SetMode(gin.ReleaseMode)

[GIN-debug] GET    /admin/isHealthy          --> main.newHttpServer.func1 (3 handlers)
[GIN-debug] Listening and serving HTTP on :8080
^Cprofile: caught interrupt, stopping profiles
profile: cpu profiling disabled, /var/folders/x7/wnp2zjn563j2dr45dsfpvdz80000gn/T/profile467765493/cpu.pprof
±|master ✘| identifier-generator-hp
% go tool pprof —text ./app /var/folders/x7/wnp2zjn563j2dr45dsfpvdz80000gn/T/profile467765493/cpu.pprof > out.txt
parsing profile: unrecognized profile format
commented
commented 
% go tool pprof ./app /var/folders/x7/wnp2zjn563j2dr45dsfpvdz80000gn/T/profile467765493/cpu.pprof                             nsitbon@mac-ns
Entering interactive mode (type "help" for commands)
(pprof)

but I don't know what to do. When I said your version above (with the 2 commands) worked I mean I got the same thing as now.

commented
commented

Ok thank you Dave.