Golang profiles in chrome tracing

View golang profiles in chrome tracing viewer!

1. Collect pprof trace

You need to start profiling in your go code:

• add to source code:

  var cpuprofile = flag.String("cpuprofile", "", "cpu profile output")

  func main() {
    flag.Parse()
    if *cpuprofile != "" {
        f, err := os.Create(*cpuprofile)
        if err != nil {
            log.Fatal(err)
        }
        pprof.StartCPUProfile(f)
        defer pprof.StopCPUProfile()
    }

• compile program

• run it with flag cpuprofile:

main.exe -cpuprofile=trace.pprof

2. Convert trace with Intel® SEAPI

Run cmd:

python sea_runtool.py -f gt --input trace.pprof

3. Notes

• you need protobuf for python installed to use this feature

• trace should be written in pprof format, serialized with protobuf and gzipped

• trace should have .pprof extension

• go runtime collects lightweight profiles without symbol info to see function names and file locations symbolize profiles and then convert:

go tool pprof -proto -output=trace_symbolized.pprof main.exe trace.pprof
python sea_runtool.py -f gt --input trace_symbolized.pprof

4. Trace view

You will get the trace, visit chrome://tracing and load it:

Special thanks to Kolistratova Daria for enabling of Golang profiling in Intel® Single Event API!