[horde] Memory Exhaustion Problems

[Aaron Mahler]

  Kevin,

   Thanks for responding.

   The kernel is the stock FC4 kernel - 2.6.11-1.1369_FC4smp. I  
usually build a custom kernel for each box, but didn't get around to  
it on this machine yet. I'm thinking about doing that soon on here,  
but I don't know that it's going to be a big help in this case  
(unless you're aware of issues).

    My apache config isn't terribly large, but there are some smaller  
modules in there I suppose I could spare. PHP I'll have to look at  
more closely. What I can say is that I didn't add any more to PHP  
than the Horde docs said I needed for the functionality we require.  
If there are additional default elements in the PHP build that I  
could whack, I'll need to figure that out.

    This box isn't running anything BUT this horde configuration, so  
I want to clarify that no other activities or applications should be  
causing trouble.

    So far as I can tell, mysqld seems to be using a pretty constant  
115 megs or RAM... unless it's mushrooming all of the sudden when  
things go south, but I don't think that's the case. I've added it to  
my per-minute memory monitoring for now and it's holding steady.

    It's hard to say how many users we have at any given moment. I  
can say that the number of accounts that could -potentially- use it  
comes from a pool of a couple of thousand... but realistically it's  
not likely to be more than a few hundred potential -active- users and  
far, far LESS than that number are likely to be logging in at any  
given moment (a few dozen at once tops...MAYBE).

    Are there any approximate numbers you can cite of users per  
megabyte of memory or some other such metric?

    Is there a simple and easy way to see how many sessions are  
currently active at any given moment? Actually, I can check how many  
open IMAP sessions on our mail server are coming from the horde box's  
address, but I'll need to spot check that frequently to get a real  
sense of the average.

    I'm certainly not going to argue that the box (or memory) might  
be undersized for the task... but like I said before, a far, far  
smaller box than this (fraction of the RAM and CPU) handled this  
approximate load under Horde 2.x for around two years without every  
behaving in this manner. Is the new Horde system that much larger in  
terms of resource usage?

Thanks!
  - Aaron

On Aug 26, 2005, at 4:38 PM, Kevin M. Myer wrote:

> As a simple enhancement to your existing setup, try running MySQL on a
> separate
> server - one server (or cluster) for web, one server (or cluster) for
> mail, one
> server (or cluster) for database.
>
> Pare down your Apache and PHP modules as much as possible.
>
> You don't mention the number of users but one Gb of RAM is not a lot,
> especially
> if you are running Apache and MySQL on the same server and have any  
> volume of
> users.
>
> What kernel version are you running?
>
> Kevin
>
> -- 
> Kevin M. Myer
> Senior Systems Administrator
> Lancaster-Lebanon Intermediate Unit 13  http://www.iu13.org
>
>
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