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From Igor Galić <i.ga...@brainsware.org>
Subject Re: [users@httpd] Apache spawning "broken" sub-processes under load
Date Tue, 01 Feb 2011 14:29:32 GMT

----- "Dave Barton" <dave.barton@comodo.com> wrote:

> Hi,
> 
> To answer the questions from the other email first;
> 
> >>Which version of WP?
> >>Did you make -- recently -- any changes? Upgrade, install new
> plugins?
> >>Did you traffic spontaneously increase?
> 
> It's an old version (2.7) but I'm not sure how much of an option an
> upgrade is. I'll have to raise it with our developers.

I don't see my questions actually answered :-/
Did anything change?

Or did you just suddenly start monitoring the system and realized
you've got a 

> >>Given the line-breaks it's *really* hard to read what you mean :-/
> 
> Sorry :(

I would love to present to you the `ps -o` option.
Along with -u<apacheuser> they are powerful tools.


> >>Are you running this in a Zone/Container/Jail/Vz/blah
> 
> The WordPress installation is running as an Apache vhost on a Xen
> virtual machine. The VM is only used for Apache and doesn't run
> anything
> else (except stuff like ntpd and snmpd of course).

As with any virtualization, I'd run ntpd on the Xen host only.

> Other answers are in-line below. Thanks for trying to help me out! :)
> 
> Dave
> 
> On 31/01/11 18:28, Igor Galić wrote:
> > 
> > ----- "Dave Barton" <dave.barton@comodo.com> wrote:
> > 
> >> Should really have included this;
> >>
> >> # apache2 -v
> >> Server version: Apache/2.2.14 (Unix)
> >> Server built:   Jan 29 2010 12:34:06
> >>
> >> # apache2ctl modules
> >> [Mon Jan 31 17:29:24 2011] [warn] module status_module is already
> >> loaded, skipping
> >> Loaded Modules:
> >>  core_module (static)
> >>  mpm_worker_module (static)
> >>  http_module (static)
> >>  so_module (static)
> >>  alias_module (shared)
> >>  auth_basic_module (shared)
> >>  authn_alias_module (shared)
> >>  authn_anon_module (shared)
> >>  authn_default_module (shared)
> >>  authn_file_module (shared)
> >>  authz_groupfile_module (shared)
> > 
> > Do you really need all these modules?
> > Take a look at: http://httpd.apache.org/docs/current/mod/
> > To see which you can safely remove.
> 
> Looking into that now, thanks for the tip.

Likewise you should probably look into what PHP extensions
you're loading and which you're actually using.


> > [snip]
> >>  info_module (shared)
> >>
> >> # php -v
> >> PHP 5.2.12-pl0-gentoo (cli) (built: Jan 26 2010 16:48:31)
> >> Copyright (c) 1997-2009 The PHP Group
> >> Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies
> > 
> > Are you running PHP with APC or a different accelerator? If not,
> > you should a) consider it, and b) be aware that WP has some issues
> > with these..
> 
> We're not running any accelerator with PHP. The traffic levels for
> this
> site are generally so low that it's not an issue and they can be more
> trouble than they are worth.

My experience tends to be vice verse. I guess everyone is entitled to
their own opinion, given their experiences ;)
 
> >> # uname -a
> >> Linux mcpweb2 2.6.31-xen-r10 #1 SMP Sat Nov 27 14:17:17 UTC 2010

duh. Should've seen it's Xen.

Anyway. It 
> >> x86_64
> >> Intel(R) Xeon(R) CPU E5530 @ 2.40GHz GenuineIntel GNU/Linux
> >>
> >> If anything else is needed, please let me know.
> >>
> >> Cheers
> >>
> >> Dave Barton
> >> Senior Systems Administrator
> >> Comodo CA Ltd
> > 
> > i

i

-- 
Igor Galić

Tel: +43 (0) 664 886 22 883
Mail: i.galic@brainsware.org
URL: http://brainsware.org/

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