test/rand/rand_test.go

package rand_test

import (
	"math"
	"math/rand"
	"testing"
)

func BenchmarkRand(b *testing.B) {
	for i := 0; i < 100000000; i++ {
		rand.Int63n(math.MaxInt64)
	}
	/*
		goos: darwin
		goarch: amd64
		pkg: trial/rand
		cpu: Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz
		BenchmarkRand-8   	       1	4164423941 ns/op
	*/
}

func BenchmarkNop(b *testing.B) {
	for i := 0; i < 1000000000; i++ {
	}
	/*
		goos: darwin
		goarch: amd64
		pkg: trial/rand
		cpu: Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz
		BenchmarkNop-8   	       1	2048992111 ns/op
	*/
}

func BenchmarkDiv(b *testing.B) {
	for i := 0; i < 1000000000; i++ {
		func() {}()
	}
	/*
		goos: darwin
		goarch: amd64
		pkg: trial/rand
		cpu: Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz
		BenchmarkDiv-8   	       1	2693673826 ns/op
	*/
}