main.go

package main

import (
	"runtime"
)

func init() {
	runtime.GOMAXPROCS(runtime.NumCPU())
}

func main () {
	for i := 0; i < 10000; i++ {
		m := make(map[int]int)
		for j := 0; j < 10000; j++ {
			if _, exist := m[j]; !exist {
				m[j] = i
			}
		}
	}
}