go - How to profile benchmarks using the pprof tool? -


i want profile benchmarks generated go test -c, go tool pprof needs profile file generated inside main function this:

func main() {     flag.parse()     if *cpuprofile != "" {         f, err := os.create(*cpuprofile)         if err != nil {             log.fatal(err)         }         pprof.startcpuprofile(f)         defer pprof.stopcpuprofile()     }

how can create profile file within benchmarks ?

as described in http://golang.org/cmd/go/#hdr-description_of_testing_flags can specify profile file using flag -cpuprofile.

for example 

go test -cpuprofile cpu.out

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