on a basic node http server like this:
var http = require('http');
var server = http.createServer(function(req, res){
console.log("number of concurr. connections: " + this.getConnections());
//var pendingConnections = ???
});
server.maxConnections = 500;
server.listen(4000);
if i send 500 requests at one time to the server, the number of concurr.
connections is arround 350. with the hard limit set to 500 (
net.server.backlog too), i want to know, how to access the number of
pending connections (max. 150 in this example) when ever a new request
starts.
so i think i have to access the underlying socket listening on port 4000 to
get this info, but until now i was not able to get it.
*EDIT*
looking at node-http there is an event called connection, so i think the
roundtrip of an request is as follows:
1. client connects to server socket --> 3-way-handshake, socket lasts in
state CONNECTED (or ESTABLISHED ?!) then in node event connection is
emitted.
2. the node http server accepts this pending connection an starts
processing the request by emitting request
so the number of connections has to be at least as big as the number of
requests, but with following example i could not confirm this:
var http = require('http');
var activeRequets = 0;var activeConnections = 0;
var server = http.createServer(function(req, res){
activeRequests++;
res.send("foo");
});
server.on('connection', function (socket) {
socket.setKeepAlive(false);
activeConnections++;
});
setInterval(function(){
console.log("activeConns: " + activeConnections + " activeRequests: " +
activeRequests);
activeRequests = 0;
activeConnections = 0;
}, 500);
server.maxConnections = 1024;
server.listen(4000, '127.0.0.1');
even if i stress the server with 1000 concurr connections and adding one
delay in the response, activeRequests is mostly as high as activeConnections.
even worse, the activeRequests are often higher then activeconnections, how
could this be?
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