[Systems] Apache is hogging the CPU on solarsail

[Chris Rowe]

Hi guys

I am in Cambridge now if there is anything I can do to check on the server.

Also, we have a contact at Akamai that has offer to help us out when
we need it. Would a CDN be helpful in reducing the load?

Chris

On 6/25/09, Bernie Innocenti <bernie at codewiz.org> wrote:
> On 06/25/09 11:59, Bernie Innocenti wrote:
>> On 06/25/09 11:53, Bernie Innocenti wrote:
>>> On 06/25/09 11:44, Bernie Innocenti wrote:
>>>>  5686 www-data  20   0  313m  50m  22m R  103  0.2   0:56.39 apache2
>>>>  9877 www-data  20   0  313m  49m  21m R  103  0.2   0:15.48 apache2
>>>>  2009 www-data  20   0  313m  53m  25m R  100  0.2   1:22.23 apache2
>>>>  2442 www-data  20   0  314m  72m  43m R   96  0.2   1:28.54 apache2
>>>>  5472 www-data  20   0  314m  53m  23m R   96  0.2   0:31.36 apache2
>>>>  5675 www-data  20   0  313m  58m  30m R   96  0.2   0:49.86 apache2
>>>>  5681 www-data  20   0  308m  44m  22m R   96  0.1   0:01.06 apache2
>>>>  9845 www-data  20   0  314m  50m  21m R   96  0.2   0:23.26 apache2
>>>>  9876 www-data  20   0  312m  49m  21m R   96  0.2   0:15.46 apache2
>>>> 10271 www-data  20   0  308m  45m  21m R   96  0.1   0:01.10 apache2
>>>>
>>>> I'm investigating
>>>
>>> This is no bug: we're really being hit by several connections per
>>> second.  The load comes from the wiki.
>>>
>>> One of the main referrers is:
>>>   http://news.bbc.co.uk/2/hi/technology/8117064.stm
>>
>> What could we do to speed up the wiki a bit more?  mod_cache?
>> memcached?  We're already using APC, right?
>
> I enabled Memcached for the main wiki...  Responsiveness seem
> to have slightly improved.
>
> However, I've noticed lots of segfaults in the apache error log (also before
> installing memcached):
>
> [Thu Jun 25 06:30:53 2009] [notice] child pid 11280 exit signal Bus error
> (10)
> [Thu Jun 25 06:31:44 2009] [notice] child pid 27352 exit signal Segmentation
> fault (11)
> zend_mm_heap corrupted
> [Thu Jun 25 06:34:40 2009] [notice] child pid 27327 exit signal Bus error
> (10)
> [Thu Jun 25 06:36:12 2009] [notice] child pid 5972 exit signal Illegal
> instruction (4)
> [Thu Jun 25 06:36:14 2009] [notice] child pid 29106 exit signal Segmentation
> fault (11)
> [Thu Jun 25 06:39:31 2009] [notice] child pid 29114 exit signal Illegal
> instruction (4)
> [Thu Jun 25 06:40:11 2009] [notice] child pid 17198 exit signal Segmentation
> fault (11)
> [Thu Jun 25 06:41:03 2009] [notice] child pid 29786 exit signal Segmentation
> fault (11)
> [Thu Jun 25 06:43:51 2009] [notice] child pid 23083 exit signal Segmentation
> fault (11)
> [Thu Jun 25 06:45:19 2009] [notice] child pid 23225 exit signal Segmentation
> fault (11)
>
> Given the diversity of these errors, I have quite a scary theory: CPU
> overheating?
>
> --
>    // Bernie Innocenti - http://codewiz.org/
>  \X/  Sugar Labs       - http://sugarlabs.org/
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