Subject: Re: Excessive swapping / Memory problems
To: Chuck Swiger <email@example.com>
From: Vincent van Scherpenseel <firstname.lastname@example.org>
Date: 09/06/2006 22:55:31
Chuck Swiger wrote:
> On Sep 6, 2006, at 12:40 PM, Vincent van Scherpenseel wrote:
>>> "top -o size" will show you which processes are requiring lots of
>>> memory; it's possible that one of them is leaking, or it may simply
>>> be that you are trying to run too much on a machine with limited
>>> RAM. Increasing the amount of RAM in your machine is probably going
>>> to improve the performance of the system significantly...
>> The strange thing is that it's a very low loaded machine, only running
>> an SMTP server for my daily mail (about 50 messages a day) and a
>> webserver for my personal website (http://vincent.vanscherpenseel.nl).
>> Most of the visitors are spambots targeting the blog comment system (I
>> really need to implement a CAPTCHA check, I know).
>> Here is the top output of top -o size:
>> PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU
>> 9747 www -4 0 35M 4K semwait 0:32 0.00% 0.00% httpd
> [ ... ]
> Ah, eight to ten 35MB apache children will consume most or all of your
> RAM and swap space.
> Apache normally uses a lot less; a stock Apache-1 without anything
> expensive will take 5-8MB, and even Apache-2 + mod_perl or PHP takes
> around 15 - 20MB; perhaps you can reduce the max # of children running
> or remove a module or two that is bumping your memory usage up so much...
Yes, but how does it come that it's taking 35megabytes? I'm running
Apache2 with PHP. I never had these problems. Like I said: I hardly ever
get any visitors so I could probably reduce the number of childs.
However, I find it rather strange that these problems suddenly occur.
Vincent van Scherpenseel