go-Golang-go

using go for what it's claimed good for - concurrency.

Situation:

You have to send salary to 4 men. You can send the salaries one by one using a for loop. But you want to make a faster parallel operation so that you can go home early.

Simple For loop solution

/* Go concurrency test
*
* author: ashraf minhaj
* mail  : ashraf_minhaj@yahoo.com
 */

package main

import (
	"log"
	"time"
)

func main() {
	start := time.Now()
	log.Println("hey man")

	// a for loop
	salarySheet := [3]int{400, 500, 600}

	for indx, salary := range salarySheet {
		log.Println(indx, salary)
		sendSalary(salary)
	}
	log.Println("Execution Time:", time.Since(start))
}

func sendSalary(salary int) {
	log.Println("Sending salary, amount:", salary)
}

output:

2023/01/19 00:24:43 hey man
2023/01/19 00:24:43 0 400
2023/01/19 00:24:43 Sending salary, amount: 400
2023/01/19 00:24:43 1 500
2023/01/19 00:24:43 Sending salary, amount: 500
2023/01/19 00:24:43 2 600
2023/01/19 00:24:43 Sending salary, amount: 600
2023/01/19 00:24:43 Execution Time: 328.584µs

with concurrency

Strange!

2023/01/19 00:36:38 hey man
2023/01/19 00:36:38 0 400
2023/01/19 00:36:38 1 500
2023/01/19 00:36:38 2 600
2023/01/19 00:36:38 Sending salary, amount: 600
2023/01/19 00:36:38 Sending salary, amount: 400
2023/01/19 00:36:38 Sending salary, amount: 500
2023/01/19 00:36:38 Execution Time: 430.5µs

Let's give it some load

Now we add a little delay of 10 seconds using the time.sleep() function.

Now it get's a little heavy and outputs -

2023/01/19 00:40:47 hey man
2023/01/19 00:40:47 0 400
2023/01/19 00:40:57 Sending salary, amount: 400
2023/01/19 00:40:57 1 500
2023/01/19 00:41:07 Sending salary, amount: 500
2023/01/19 00:41:07 2 600
2023/01/19 00:41:17 Sending salary, amount: 600
2023/01/19 00:41:17 Execution Time: 30.003529167s

with added concurrency with go...

2023/01/19 00:44:02 hey man
2023/01/19 00:44:02 0 400
2023/01/19 00:44:02 1 500
2023/01/19 00:44:02 2 600
2023/01/19 00:44:12 Sending salary, amount: 400
2023/01/19 00:44:12 Sending salary, amount: 600
2023/01/19 00:44:12 Sending salary, amount: 500
2023/01/19 00:44:12 Execution Time: 10.001873666s

Interesting, isn't it? What took 30 seconds to process is now done in only 10!

ashraf-minhaj/go-Golang-go

go-Golang-go

Situation:

Simple For loop solution

with concurrency

Let's give it some load