HTTP response time profiling

Posted by Sparsh Gupta on Server Fault See other posts from Server Fault or by Sparsh Gupta
Published on 2011-02-28T06:55:57Z Indexed on 2011/02/28 7:26 UTC
Read the original article Hit count: 576

Filed under:

nginx

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http

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munin

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response-time

Hello

I have a nginx reverse proxy. The server is close to serving 600-700 requests per second. I have a Munin HTTP load time plugin which is outputting this:

http://monitor.wingify.com/munin/visualwebsiteoptimizer.com/lb1.visualwebsiteoptimizer.com-http_loadtime.html

Now, the problem is I am seeing some spikes in the graph. Expected response times should always be under 200ms. I am keeping an eye on syslog and messages but I am unable to figure out the actual cause of this. I was wondering if there is any good HTTP response time profiling system which I can install / embed with this nginx server and get a detailed reports / logs on the breakup of time taken by different things and what exactly is the cause of the spikes.

The profiling system would also help me understand bottlenecks and how can I further optimize the latency.

Most important right now is to investigate the cause of the spikes in the HTTP load time graphs (similar pattern is reported by external monitors - Pingdom) and to fix it to get consistent response times

Thanks

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