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From: Enrico Daga <enricodaga@gmail.com>
Date: Wed, 21 Dec 2011 13:06:44 +0100
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To: =?UTF-8?Q?Igor_Gali=C4=87?= <i.galic@brainsware.org>
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Subject: Re: [users@httpd] RAM problem with apache and PHP on default centos
 configuration

Thank you all for your hints.
The problem was a misconfiguration, and seems to be solved reducing
the number of child processes and adjusting MaxRequstPerChild
parameter.

We will try also with mod_fcgid.
Do you know any trade off with respect to mod_php for developers
(differences in env variables, for example)?

Enrico

2011/12/14 Igor Gali=C4=87 <i.galic@brainsware.org>:
>
>
> ----- Original Message -----
>> On 12/12/2011 12:17, Enrico Daga wrote:
>> > Hi all,
>> >
>> > I send this mail to both httpd and php lists.
>> > I experienced the following problem running php scripts on httpd.
>> > The RAM fills gradually until the system starts swapping, then, if
>> > I
>> > don't restart the server, swap fills and everything goes down.
>> > After some try/check tests, I realized that the memory used by a
>> > single request is never released when the process is complete. This
>> > makes the RAM to be gradually filled.
>> > I thought in the beginning was a problem with the php application
>> > and
>> > circular references on objects (I found some posts about this) then
>> > I
>> > tried with a simple script (just populating a single array) but the
>> > problem still occurs.
>> > Our production environments are on Centos 4.9 - we have some legacy
>> > applications that prevented us to upgrade the servers before.
>> > For this sake I tried on fresh systems and more recent versions,
>> > and
>> > experienced the same problem on Centos 4.9, 5.5 / PHP 5.1.6 and
>> > Centos
>> > 6 / PHP 5.3.6, with distributed packages for both httpd and php and
>> > default configuration. Httpd uses the Prefork MPM module.
>> > I also noticed that this _do not_ happen on Ubuntu 11.10 server. I
>> > had
>> > a look at the configuration of both httpd and php, but in both
>> > cases
>> > (Centos and Ubuntu) I could not noticed a difference on parameters
>> > regarding memory usage.
>> >
>> > Since this is the first time we run PHP applications on our httpd
>> > servers I guess there is some configuration I should modify to have
>> > the system behave correctly (free the memory when it is not
>> > needed).
>> > The only workaround would be to move the MaxRequestsPerChild
>> > parameter
>> > to 1, then killing the sub-process that hold the request, but I
>> > don't
>> > believe this is the right solution.
>> > Finally, I am not so sure that the issue I describe here belong to
>> > the
>> > httpd or php lists, in this case please apologies, I would be very
>> > happy if you can point me to a red-hat list (found a lot of lists,
>> > but
>> > no sure which is related to httpd/php issues).
>> >
>> > Thank you very much for any hint.
>> >
>> > Best regards,
>> > Enrico
>> >
>>
>> Attach your configs when asking help, to have better performance
>> (memory/cpu
>> usage) dont use mod_php, instead try running php as cgi application
>> (cgid).
>
> or rather, mod_fcgid
>
>> --
>> Simone Caruso
>> IT Consultant
>> +39 349 65 90 805
>>
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>
> --
> Igor Gali=C4=87
>
> Tel: +43 (0) 664 886 22 883
> Mail: i.galic@brainsware.org
> URL: http://brainsware.org/
> GPG: 6880 4155 74BD FD7C B515 =C2=A02EA5 4B1D 9E08 A097 C9AE
>


--=20
Enrico Daga

--
http://www.enridaga.net
skype: enri-pan

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