Measure Exection time in Go

Posted on 2 June, 2020

To know who how long your go code executes you can use the time.Now() and time.Since() methods in the time package.

Demo

package main

import (
	"fmt"
	"time"
)

func main(){

	start := time.Now()
	dur, _ := time.ParseDuration("15ms")

	// A Go Anonymous function (self-executing)
	func (){
		for i := 0; i < 100; i++ {
			time.Sleep(dur)
			fmt.Println("Bhupesh is programming in Go")
		}
	}()

	elapsed := time.Since(start)

	fmt.Printf("Execution Time : %s", elapsed)
}

Since() returns the time elapsed since t (start in our demo). It is shorthand for time.Now().Sub(t).

Here is the output of the above code You can also play with the online demo

Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Bhupesh is programming in Go
Execution Time : 750ms