pkg/profile

10 byte profile file can't be opened

thnk2wn opened this issue · 7 comments

thnk2wn commented

After profiling I get a 10 byte file (cpu.pprof.zip) that when read produces:

  • cpu.pprof: decompressing profile: unexpected EOF ( With go tool pprof cpu.pprof)
  • Unexpected end of ZLIB input stream (With Goland)

Tried both:

defer profile.Start(profile.ProfilePath(os.Getenv("HOME"))).Stop()

as well as:

p := profile.Start(profile.ProfilePath(os.Getenv("HOME")), profile.NoShutdownHook)
// ...
p.Stop()

As of 3704c8d on macOS Big Sur 11.1.

With the shutdown hook I saw the library was intercepting shutdown to stop profiling. Without it I see my code called to .Stop().

Troubleshooting ideas?

Thanks for your work.

davecheney commented

How much work is your program doing between starting and stopping the profile?

thnk2wn commented

@davecheney I ran the API app for about 5 minutes and made several requests over HTTP and web sockets that hit PostgreSQL, Elastic Search, Redis, 3rd party APIs, S3, etc.

davecheney commented

Seems reasonable; how are you stopping the program, or the profile?

thnk2wn commented
davecheney commented

Can you reproduce the issue on a non big sur machine? Maybe try the trace profile not CPU profile. Perhaps pprof is broken on big sur

thnk2wn commented

For my needs https://github.com/gin-contrib/pprof worked but can maybe look into this more later. Thanks

davecheney commented

ok, no problem. I'll close this for the moment, please feel free to reopen it in the future.