does anybody have a simple pprof use on a go-executable? - go

Question

I have looked at the article about profiling go programs, and I simple do not understand it. Do someone have a simple code example were the performance of code snippet is logged in text file by a profile-"object"?

Answer 1

Here are the commands I use for a simple CPU and memory profiling to get you started.
Let's say you made a benchmark function like this :
File something_test.go :
func BenchmarkProfileMe(b *testing.B) {
// execute the significant portion of the code you want to profile b.N times
}
In a shell script:
# -test XXX is a trick so you don't trigger other tests by asking a non existent specific test called literally XXX
# you can adapt the benchtime depending on the type of code you want to profile.
go test -v -bench ProfileMe -test.run XXX -cpuprofile cpu.pprof -memprofile mem.pprof -benchtime 10s
go tool pprof --text ./something.test cpu.pprof ## To get a CPU profile per function
go tool pprof --text ./something.test cpu.pprof --lines ## To get a CPU profile per line
go tool pprof --text ./something.test mem.pprof ## To get the memory profile
It will present you the hottests spots in each cases on the console.