I have a simple case where I'm requesting a different upstream proxy server
from my node.js server. With the increase in load I see the request takes
lot of time to execute(though time taken to respond from my upstream proxy
server is constant across the requests). To demonstrate the issue i've
written a sample program as below. If you execute the below program, the
first request takes *118ms* to execute and the last one takes *10970ms*. If
you observe i'm using async to parallelize my requests.
*The question is*, what is the reason node.js takes this much time to
execute a request when run in parallel. To give some more context on the
infra settings(centos 6.5) I have opened up my port range from 1024 to
65535, change the fin_timeout to 15 seconds and enable tw_reuse =1 for
sockets in sysctl.conf
var http = require('http');var uuid = require('node-uuid');var async =
require('async');
function callExternalUrl(){
var uniqueId = uuid.v4();
console.time(uniqueId);
var options = {
host: 'google.com',
port: '80',
path: '/',
method: 'GET'
};
var req = http.request(options, function(res) {
var msg = '';
res.setEncoding('utf8');
res.on('data', function(chunk) {
msg += chunk;
console.timeEnd(uniqueId);
});
res.on('end', function() {
});
});
req.end();}
function iterateAsync(callback){
var iter = [];
for(var i=0; i<1000; i++){
iter[i] = i;
}
async.each(iter,
function(item, callback) {
callExternalUrl();
},
function(err) {
callback(err);
}
);}
iterateAsync(function(){console.log('done');});
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