Test Usage of CPU Raw

cpu_process.go

// Copyright 2017 rodkranz. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package main

import (
	"fmt"
	"runtime"
	"time"
)

var t int = 60 // seconds
var i int = 0

func init() {
	// set the cpu number here (1, 2, 3...) 
	// runtime.NumCPU get the max cpu number.
	runtime.GOMAXPROCS(runtime.NumCPU())
}

func main() {
	go func() {
		fmt.Print("Exiting in... ")
		for i := t; i > 0; i-- {
			fmt.Printf("%d... ", i)
			time.Sleep(1 * time.Second)
		}
	}()

	for i := 0; i < 10000; i++ {
		go Inc()
	}

	time.Sleep(time.Duration(t) * time.Second)
	fmt.Printf("\nFinished \\o/ (%dx)!\n", i)
}

func Inc() {
	for {
		i++
		time.Sleep(1 * time.Nanosecond) // if you remove this line your cpu will be 100%
	}
}