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From Plutocrat <plutoc...@gmail.com>
Subject Re: [users@httpd] Troubleshooting Apache Out of Memory Errors
Date Mon, 12 Jan 2009 03:42:03 GMT
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@gmail.com
> <mailto:plutocrat@gmail.com>> 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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