How to test nodejs concurrent Request

Question

I want to write a simple code to test nodejs Concurrency when it receives many requests.

And I use loadtest module for simulate send many requests to server with this command :

loadtest -c 10 --rps 200 http://localhost:3000/

my simple code that write in server.js :

var http = require('http');
var server = http.createServer();
var cun=0;
var step=0;       

function handleRequest(req,res) {

console.log(step++);
        while(100000000>cun){
            cun++;
        }
        cun=0;
}

server.on('request', handleRequest);
server.listen(3000);

but requests is wait until while loop is down

and know to solve this problem I should use callback function , but don't know How do write it.

Answer 1

var http = require('http');
var url = require("url");
var server = http.createServer();

function handleRequest(req, res) {
  res.writeHead(200, { 'content-type': 'text/plain'});

var params = url.parse(request.url, true).query;
var input = params.number;

/*
1- Use input param in a algorithm and process it
2- Insert data in to the db
3- select on db and return to the client
*/  

  res.end();
}
server.on('request', handleRequest);
server.listen(3000);

PROBLEM : All requests wait in a queue until last request process(process-insert-select) is down