GLAST

A comparison between concurrency and parallelism in Golang

the original idea...

BLAST

the original idea...

BLAST

BLAST

BLAST

BLAST

BLAST

concurrency vs. parallelism

GOLANG

Programming language created at Google

- Golang is open-source but backed up by a large corporation

- Many big companies used it for their projects (Google, Dropbox, Soundcloud, Docker, Cloudflare, BBC...)

- It’s fast (to learn, to develop in, to compile, to deploy, to run)

- Go is a modern language

- Golang is simple

- Good cross-platform support

- Go is safe

- Rapid development and growing community

- It’s concurrent

GOROUTINES

Lightweight thread of execution.

package main

import (
	"fmt"
	"time"
)

func say(s string) {
	for i := 0; i < 5; i++ {
		time.Sleep(100 * time.Millisecond)
		fmt.Println(s)
	}
}

func main() {
	go say("world")
	say("hello")
}
/*
    world
    hello
    hello
    world
    world
    hello
    hello
    world
    world
    hello
*/

GOMAXPROCS

Limits the number of operating system threads that can execute user-level Go code simultaneously

func GOMAXPROCS(n int) int

Glast

We will count the lines quantity in a large file using a basic master - worker model in Golang in four different ways:

1. Linear
2. Using goroutines (concurrency)
3. Using GOMAXPROCS (parallelism)
4. Using goroutines & GOMAXPROCS

Glast - results

Glast - results

More info...

https://github.com/ManuCastrillonM/glast

ThANK YOU!

Questions?