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From Dave Barton <dave.bar...@comodo.com>
Subject Re: [users@httpd] Apache spawning "broken" sub-processes under load
Date Mon, 31 Jan 2011 17:30:32 GMT
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)
 authz_host_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 cgid_module (shared)
 dbd_module (shared)
 deflate_module (shared)
 dir_module (shared)
 env_module (shared)
 expires_module (shared)
 filter_module (shared)
 headers_module (shared)
 include_module (shared)
 log_config_module (shared)
 logio_module (shared)
 mime_module (shared)
 mime_magic_module (shared)
 negotiation_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)
 ssl_module (shared)
 status_module (shared)
 unique_id_module (shared)
 usertrack_module (shared)
 php5_module (shared)
 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

# uname -a
Linux mcpweb2 2.6.31-xen-r10 #1 SMP Sat Nov 27 14:17:17 UTC 2010 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

On 31/01/11 16:53, Dave Barton wrote:
> Hi,
> 
> We've recently had a pretty large increase in the usage of one of our
> Wordpress-powered sites. I'm seeing some very odd behaviour and I'm at a
> loss as to how to investigate it further. Some of the apache processes
> are spawning children with broken CPU usage and time stats (as shown by
> ps auxf). I think it might be best just to show some examples;
> 
> root      3153  0.0  0.4 304688 12960 ?        Ss   15:26   0:00
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache    3155  0.0  0.1 215864  3816 ?        S    15:26   0:00  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   12135 129895172  4.0 542620 127208 ?  Sl   16:33 21114987:41
> \_ /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   12353 10.6  4.0 729908 127676 ?       Sl   16:34   1:20  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   12875 11.1  3.8 773840 121116 ?       Sl   16:36   1:09  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   13222  9.1  4.1 845240 130568 ?       Sl   16:38   0:49  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   13445 10.5  3.6 725956 114972 ?       Sl   16:39   0:50  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   13582  9.4  3.5 792056 112884 ?       Sl   16:39   0:42  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   14148  9.2  3.4 724848 107920 ?       Sl   16:42   0:27  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   14253 290358163  3.4 709912 108308 ?  Sl   16:42 21133796:09
> \_ /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   14287 431815  3.5 717512 110180 ?     Sl   16:42 19215:48  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   14356  9.5  3.5 722780 111908 ?       Sl   16:43   0:24  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   14392 324909060  3.9 735640 123796 ?  Sl   16:43 21133795:59
> \_ /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   14418  9.6  4.0 781036 128604 ?       Sl   16:43   0:21  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   14952 11.8  2.8 709736 91072 ?        Sl   16:46   0:07  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   15294  8.4  2.5 761932 80584 ?        Sl   16:46   0:02  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   15329 90923337  2.3 695200 73448 ?    Sl   16:46 21153009:43
> \_ /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   15364  7.8  2.3 683200 74408 ?        Sl   16:46   0:01  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   15371  9.3  2.3 694896 74564 ?        Sl   16:46   0:02  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> apache   15423 15.8  2.3 755896 74888 ?        Sl   16:47   0:02  \_
> /usr/sbin/apache2 -D SSL -D PHP5 -D STATUS -d /usr/lib64/apache2 -f
> /etc/apache2/httpd.conf -k start
> 
> The apache server-status page shows these up as processing requests
> correctly (state K, C or R) but with improbably high values in the CPU
> column.
> 
> If anyone has any ideas where I can start looking (or can just tell me
> how to fix it!) it would be greatly appreciated.
> 
> Cheers


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