Nginx Fastcgi performance issues

Posted by Barry on Server Fault See other posts from Server Fault or by Barry
Published on 2010-11-11T14:15:22Z Indexed on 2012/06/20 3:17 UTC
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nginx

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fastcgi

I am running several fastcgi servers behind Nginx. I run 3 Nginx workers and 6 fastcgi servers as upstream backends.

When I run load tests of 1 req per sec, I can clearly see that on avarage a reply is 0.1sec, but from time to time there are 3.1 sec responses.

It is a suspiciously deterministic number and it happens even at very small loads from time to time. Both CPU and Memory are of no issue at all.

Any idea where this delay may be comming from? Any suggestions how to debug this?

Many thanks, Barry.

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