[Gllug] web server performance

[Doug Winter]

Alain Williams wrote:
> Can anyone offer tips on monitoring web server performance ?
> 
> I am helping to look after a small web server (apache/php/mysql) on a small box
> (64MB bytemark - running debian). It works well most of the time, nice & fast,
> but occasionally some users report very sluggish response. It is running at
> a couple of hits a second, the database part is very light.

If you've really only got 64MB then I reckon you are probably swapping 
at times, which causes a massive performance hit.  It might be because 
of webserver load (spiders can be an issue even for small sites) or it 
might be because of other stuff running (with such a small amount of 
memory, even firing up exim is going to wallop your swap).

Try running ab with a sensible concurrency, and watch vmstat.  If you 
see a lot of activity in the si and so columns, then you might want to 
reduce the number of apache or mysql processes you spawn.

Cheers,

Doug.

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