gistfile1.txt

package main

import (
	"fmt"
	"runtime"
	"testing"
)

func main() {
	fmt.Printf("add %v\n", testing.Benchmark(benchAdd))
	fmt.Printf("del %v\n", testing.Benchmark(benchDel))
}

const N = 1e6

func benchAdd(b *testing.B) {
	for i := b.N-1; i >= 0; i-- {
		b.StopTimer()
		runtime.GC()
		m := make(map[int]int)
		b.StartTimer()
		for j := 0; j < N; j++ {
			m[j] = 0
		}
	}
}

func benchDel(b *testing.B) {
	for i := b.N-1; i >= 0; i-- {
		b.StopTimer()
		m := make(map[int]int)
		for j := 0; j < N; j++ {
			m[j] = 0
		}
		runtime.GC()
		b.StartTimer()
		for j := 0; j < N; j++ {
			m[j] = 0, false
		}
	}
}