nginx high memory usage in benchmarks

[Igor Sysoev]

On Wed, Jun 17, 2009 at 07:16:16PM +0200, Martin Reissner wrote:

> hello,
> i've been running some benchmarks for static content with httperf and
> autobench to compare nginx to apache's worker mpm. i used the default
> config on apache (2 worker processes, 150 max clients) and set nginx to
> use 2 worker processes with epoll and a keepalive_timeout of 15.
> during the benchmarks i monitored the systems ressources with sar and
> while i expected nginx to outperform apache in every way possible i
> noticed that nginx uses way more ram than apache while staying ~1/3rd
> behind it in cpu usage.
> 
> the benchmarks request a 10k file repeatedly over multiple persistent
> connections and while apache used ~5mb throughout the tests nginx took
> ~70mb. can someone explain to me what the cause of this might be. from
> what i read its low memory usage is one of the key features of nginx so
> i'm pretty sure somethings wrong on my side.

What nginx version have you tested ?
How many worker_connections did you set ?


-- 
Igor Sysoev
http://sysoev.ru/en/