Just so you know the conclusion of the story ....
I started looking at ways to reduce the memory footprint of Joomla. I've currently enabled its inbuilt cache, which seems to have done the trick. I'll run it like this for a while and let you know what happens, but it seems to have been OK for the last week, fingers crossed.
As to _why_ Joomla is demanding so much memory, I'm still puzzled.
Jim
> On Mon, Jan 5, 2009 at 3:27 PM, Plutocrat <plutocrat@xxxxxxxxx
> <mailto:plutocrat@xxxxxxxxx>> wrote:
>
> Thanks for the speedy reply Sander.
>
> Sander Temme wrote, On Monday, January 05, 2009 02:21 PM:
> > What do you mean when you say 'cli'? Are you using mod_php, or running
> > it as a CGI?
>
> Hmm,. Not exactly sure. That was the output of php --version.
>
> I've got the php5_module loaded according to apachectrl -M and the
> cgi_module as well.
>
> With php --info I can see that it has the following compile flags
> '--enable-force-cgi-redirect''--enable-fastcgi'
> and further down it tells me
> Server API => Command Line Interface
>
> Does that help. I don't really know what I'm looking for here.
>
> >> memory_limit = 100M
> > Note that memory_limit is per script executed. I believe the
> default is
> > 8Mb: what made you change that?
>
> Joomla seems to require it. I tried reducing to 10, 20, 32, 64, but
> Joomla wouldn't even display a page, so I put it back to 100Mb. So
> maybe this is the key. Joomla is somehow sucking up too much memory,
> and when it gets hit hard, it fills up the memory too quick. If PHP
> is running as an apache module then obviously httpd would be showing
> as the culprit in the ps and top commands. Hmmm. Any suggestions how
> I can get more information on Joomla/PHP memory usage?
>
> > I'd look at a couple of things:
> > 1) How does your MySQL server configuration match that Apache
> > configuration? Does your httpd ever have problems connecting to MySQL?
>
> Only when the Out Of Memory handler kills MySQLd and it doesn't
> respawn, but usually it does. Generally mysqld seems to consume
> about 2% of CPU and very little memory, so I think the httpd/php
> interaction is looking more likely. If you can give me a few
> variables you're interested in from the mysql configuration, I can
> post them here for sure.
>
> > 2) When you look at your processes in top, does the RSS column for your
> > httpd processes show any disturbing development?
> > How big do the processes get in the 4000 connections you allow them?
>
> Um, OK, I'm afraid you lost me here. RSS column? I can't see one.
> Generally the server is humming along with between 2 and 5 httpd
> processes all eating up around 8-20% of the memory.
>
> > 3) When you filter all the 404 ("File does not exist") out of your
> error
> > log, are you left with any clues?
>
> I shall take a look at this and get back to you. Thanks for the
> pointers so far. Plenty more to explore.
>
> JM
>
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