golang callers benchmark

callers_test.go

package main

import (
	"runtime"
	"testing"
)

var callers [100]uintptr
var callersCopy []uintptr

func getStack(depth int, stack []uintptr) int {
	if depth > 0 {
		return getStack(depth-1, stack)
	} else {
		return runtime.Callers(0, stack)
	}
}

func BenchmarkCallersCopy_1(b *testing.B) {
	for i := 0; i < b.N; i++ {
		callersCopy = make([]uintptr, getStack(1, callers[:]))
		copy(callersCopy, callers[:])
	}
}

func BenchmarkCallers_1(b *testing.B) {
	for i := 0; i < b.N; i++ {
		callersCopy = make([]uintptr, 100)
		getStack(1, callers[:])
	}
}

func BenchmarkCallersCopy_30(b *testing.B) {
	for i := 0; i < b.N; i++ {
		callersCopy = make([]uintptr, getStack(30, callers[:]))
		copy(callersCopy, callers[:])
	}
}

func BenchmarkCallers_30(b *testing.B) {
	for i := 0; i < b.N; i++ {
		callersCopy = make([]uintptr, 100)
		getStack(30, callers[:])
	}
}

func BenchmarkCallersCopy_60(b *testing.B) {
	for i := 0; i < b.N; i++ {
		callersCopy = make([]uintptr, getStack(60, callers[:]))
		copy(callersCopy, callers[:])
	}
}

func BenchmarkCallers_60(b *testing.B) {
	for i := 0; i < b.N; i++ {
		callersCopy = make([]uintptr, 100)
		getStack(60, callers[:])
	}
}

func BenchmarkCallersCopy_90(b *testing.B) {
	for i := 0; i < b.N; i++ {
		callersCopy = make([]uintptr, getStack(90, callers[:]))
		copy(callersCopy, callers[:])
	}
}

func BenchmarkCallers_90(b *testing.B) {
	for i := 0; i < b.N; i++ {
		callersCopy = make([]uintptr, 100)
		getStack(90, callers[:])
	}
}

output

# go test -v -bench=. 
testing: warning: no tests to run
PASS
BenchmarkCallersCopy_1	 1000000	      1858 ns/op
BenchmarkCallers_1	  300000	      4323 ns/op
BenchmarkCallersCopy_30	  200000	      7383 ns/op
BenchmarkCallers_30	  200000	      8806 ns/op
BenchmarkCallersCopy_60	  100000	     12609 ns/op
BenchmarkCallers_60	  100000	     13047 ns/op
BenchmarkCallersCopy_90	  100000	     17650 ns/op
BenchmarkCallers_90	  100000	     17506 ns/op
ok  	tmp/5pr	13.943s