[horde] Too many httpd processes and no response

[ANANT S ATHAVALE]

  ----- Message from Arjen de Korte <arjen+horde at de-korte.org> ---------
   Date: Mon, 13 Jan 2014 15:52:03 +0100
   From: Arjen de Korte <arjen+horde at de-korte.org>
Subject: Re: [horde] Too many httpd processes and no response
     To: horde at lists.horde.org

> Citeren ANANT S ATHAVALE <asa at isac.gov.in>:
>
>> Dear List,
>>
>> I have released HGWE 5.1.3 to my users from last 3 days.
>>
>> We are facing unusual problem.
>>
>> When there is not much load, there is no problem at all.
>>
>> But, during peak hours of usage on a working day, suddenly too many
httpd
>> processes start and user gets no response.  Only solution is to restart
>> httpd.  By this, there won't any issue for atleast one hour and problem
>> repeats.
>
> My first guess would be that you allow your server to spawn too many
> processes to serve the incoming requests. If this is more than the
> amount of memory allows, the result will be swapping and a dramatic
> decrease in performance. Users will try to reconnect then, worsening the
> problem. Which webserver are you using? If Apache, which MPM are you
> using?
>
> Using Apache.  prefork MPM.  Default, as provided by RHEL.
>
>> I am unable to diagonise this right now.
>>
>> 1. I have installed HGWE on RHEL 6.4
>> 2. Using APC Cache as provided with RHEL
>
> Is there enough memory available for APC? Look at the apc.php status
> page to see if there is sufficient memory available, especially if
> you're using it as a caching backend.
>
> This, I have started monitoring now.  Being a holiday today, it has only
> used 56.2 MB.  I had restarted httpd yesterday evening.  Right now, I
> have set it to 256 MB.  System has 32 GB RAM.
>
>> 3. Using PHP 5.3.3-27 as provided with RHEL
>> 4. Using SquirrelMail IMAP proxy latest stable version, compiled on the
>> same server.
>> 5. Using Cyrus-IMAP server on a remote server and following string
logged
>> in Horde-IMAP debug log
>>
>> S: * OK [CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE  XIMAPPROXY]
>> newisacmail.isac.dos.gov.in Cyrus IMAP v2.4.17-Invoca-RPM-2.4.17-6.el6
>> server ready
>
> Have you enabled IMAP caching in imp/config/backends.local.php?
>
> following is the conf.php for Horde.
>
> $conf['session']['cache_limiter'] = 'nocache';
> $conf['share']['cache'] = false;
> $conf['cache']['default_lifetime'] = 86400;
> $conf['cache']['driver'] = 'Apc';
> $conf['cache']['use_memorycache'] = 'Apc';
> $conf['cachecssparams']['driver'] = 'filesystem';
> $conf['cachecssparams']['lifetime'] = 86400;
> $conf['cachecss'] = true;
> $conf['cachejsparams']['driver'] = 'filesystem';
> $conf['cachejsparams']['compress'] = 'php';
> $conf['cachejsparams']['lifetime'] = 604800;
> $conf['cachejs'] = true;
> $conf['cachethemesparams']['check'] = 'appversion';
> $conf['cachethemesparams']['lifetime'] = 604800;
> $conf['cachethemes'] = true;
>
> and backendslocal.php for IMP it is:
>
> 'cache' => 'cache',
>
> Do I need to change this to NoSQL?
>
> I am unable to debug why httpd suddenly starts too many processes.  I
have
>
>> already enabled DEBUG log in Horde conf.php
>
> Definitly don't do this. Your investigating a performance problem here.
> Logging at level DEBUG will generate tons of information and on a busy
> server this will be enough to bring it to its knees.
>
> Today, being holiday, I will continue with DEBUG and disable in the
> evening.
>
>> Can anybody suggest, how to go about debugging further and come to some
>> conclusion.
>>
>> And to add, I have all pre-requisite installed.  I have already
disabled
>> thumbnail view to avoid high loads of CPU.  Will enable only after
>> resolving the main issue.
>> --
>>          Regards
>>           Anant
>>
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----- End message from Arjen de Korte <arjen+horde at de-korte.org> -----

Thank you very much for guiding me.  Will need your assistance (may be
some more time).
-- 
           Regards
            Anant
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