Also posted on:
http://stackoverflow.com/questions/17509959/unknown-delay-for-socket-event-in-node-js-http-module
I am noticing an unexplainable(for now) delay between http.request().end()
and when the 'socket' event fires.
req = this.__http.request({hostname: host
, port: port
, path: path
, method: method
, headers : headers
, agent: this._agent
});
req.setNoDelay(true)
req.setSocketKeepAlive(true, 0);
req.on("socket", _onSocket);
req.end()
I'm using a single connection between client and server, and also using
keep-alive throughagentkeepalive <https://github.com/TBEDP/agentkeepalive>.
This is a local app connecting to a local CouchDB server, and maintaining a
single persistent connection to it.
this._agent = new this.__agentkeepalive({
minSockets: 1
,maxSockets: 1
, maxKeepAliveRequests: 0
, maxKeepAliveTime: 300000});
I have confirmed that the same exact socket is being reused for each
request (i.e. by checking that the localPort is identical on each request),
meaning that the connection is indeed persistent throughout the life of the
app.
But from time to time there's a delay of around 100 - 400ms between the
req.end() call and when the 'socket' event fires and calls _onSocket. When
there is no such delay, it takes around 10ms for the 'socket' event to fire.
It doesn't happen all the time, it only happens sometimes, and I don't see
any obvious pattern...
Can anyone with a bit more intimate knowledge of how node.js HTTP is
implemented tell me what happens between request.end() and the 'socket'
event? What could possibly be the source of such a huge delay?
thanks
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