Parallel execution in Node

Question

I have the below code which check for each user in an array. If found, the switch case will work accordingly.

var users = ["A","B"];
function searchUser() {
for (var j = 0; j < users.length; j++) {
        execute(users[j]);
    }
}

function execute() {
switch (selectUser) {
            case "A":
            {
                return new A();
                break;
            }
            case "B":
            {
                return new B();
                break;
            }
            ............
            }
}

How can I make it run parallel. Now Im getting the output of A() and then B(). But I want it to happen vice versa also.

Wojtek Surowka · Accepted Answer · 2014-02-12 09:25:42Z

1

Though you cannot make them running truly in parallel, you can make it more asynchronous with the use of async module: https://github.com/caolan/async .

answered Feb 12, 2014 at 9:25

Wojtek Surowka

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3 Comments

Wojtek Surowka Over a year ago

If you want to call execute for each element of users array, try something like async.parallel(users.map(function(user){return function(callback){execute(user)};})); You will also need to install async with npm, and call require('async') - see the documentation in the link I send for details.

user3180402 Over a year ago

user3180402 Over a year ago

Yet im getting result "Helloo","Hiii"

aryann · Accepted Answer · 2014-02-12 09:22:17Z

0

This code looks CPU intensive and probably does not have IO involved. The node is single-threaded model so parallel processing cannot on a single core (for multiple cores you need to start multiple node processes). On the single core the throughput increases only if you have IO involved. If your present code does not have IO involved, you may not gain anything.

answered Feb 12, 2014 at 9:22

aryann

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