Simple Performance Measurement in Golang

Overview

A quick note on simple performance measurement.
I use it often, so I’m saving it here as a memo.

package main

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

func main() {
	// Number of CPUs
	cpus := runtime.NumCPU()

	// Memory at start
	var startMemory runtime.MemStats
	runtime.ReadMemStats(&startMemory)

	// Start time
	start := time.Now()


	// do something


	// Elapsed time
	elapsed := time.Since(start)

	// Memory at end
	var endMemory runtime.MemStats
	runtime.ReadMemStats(&endMemory)

	fmt.Printf("実行時間: %f 秒 \n", elapsed.Seconds())
	fmt.Printf("CPU: %d \n", cpus)
	fmt.Printf("Memory All: %f MB \n", float64(endMemory.Alloc-startMemory.Alloc)/float64(1024*1024))
}