I've created a node.js script, that scans network for available HTTP pages, so there is a lot of connections i want to run in parallel, but it seems that some of the requests wait for previous to complete.

Following is the code fragment:

    var reply = { };

    reply.started = new Date().getTime();

    var req = http.request(options, function(res) {

        reply.status = res.statusCode;

        reply.rawHeaders = res.headers;

        reply.headers = JSON.stringify(res.headers);

        reply.body = '';

        res.setEncoding('utf8');

        res.on('data', function (chunk) {

            reply.body += chunk;

        });

        res.on('end', function () {

            reply.finished = new Date().getTime();

            reply.time = reply.finished - reply.started;

            callback(reply);

        });

    });

    req.on('error', function(e) {

        if(e.message == 'socket hang up') {

            return;

        }

        errCallback(e.message);

    });

    req.end();

This code performs only 10-20 requests per second, but i need 500-1k requests performance. Every queued request is made to a different HTTP server.

I've tried to do something like that, but it didn't help:

    http.globalAgent.maxSockets = 500;