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From "Gaurav Pruthi" <gkpru...@gmail.com>
Subject Re: [users@httpd] Load Increases due to Apache
Date Sat, 30 Aug 2008 05:37:02 GMT
I have also noticed kswapd daemon causing the load on server. What i believe
is that there is some website whose pages uses lot of memory. Linux uses
kswapd for virtual memory management such that pages that have been recently
accessed are kept in memory and less active pages are paged out to disk.
So,the kswapd process regularly decreases the ages of unreferenced
pages...and at the end they are paged out(moved out) to disk.

I am using Apache 2.6. My question is that is it possible to find out which
website or script causing this? I used apachetop and find a website having
lot of hits & consuming lot of bandwidth. After suspending it, still the
issue is there. Top command is showing only httpd processes.

I have tried everything mentioned (mod_evasive,mod_cband,etc) but still
clueless. Is it possible in apache2 to run each website under different
userid? If yes then how it can be achieved? This will probably ease out to
find the culprit.


Thanks,
Gaurav Pruthi

On Fri, Aug 29, 2008 at 2:53 PM, Alexandru David Constantinescu <
aldavx@gmail.com> wrote:

> Gaurav Pruthi wrote:
>
>> Hi Agnello,
>>
>> I am using prefork MPM
>>
>> <IfModule mpm_prefork_module>
>>    StartServers         20
>>    MinSpareServers      25
>>    MaxSpareServers      50
>>    MaxClients          500
>>    MaxRequestsPerChild   0
>> </IfModule>
>>
>>
>> Thanks,
>> Gaurav
>>
>>
>> On Fri, Aug 29, 2008 at 1:30 PM, Agnello George <agnello.dsouza@gmail.com<mailto:
>> agnello.dsouza@gmail.com>> wrote:
>>
>>
>>
>>    On 8/29/08, *Gaurav Pruthi* <gkpruthi@gmail.com
>>    <mailto:gkpruthi@gmail.com>> wrote:
>>
>>        Dear Friends,
>>
>>        I am facing very strange problem. I have a LAMP server. It has
>>        around 400 of websites hosted on it. Since last one month the
>>        server load increases suddenly. When checked using top command,
>>        i saw apache process consuming 99% of CPU. After i kill httpd
>>        and starts it again (or using HUP), load comes down to the
>>        normal. It happens 8-10 times each day. I am unable to find what
>>        could cause the apache to consume all the resources of server
>>        and causing server to hang.
>>
>>        Kindly help me to resolve this issue.
>>
>>            Could you tell us the  Server-Pool Size Regulation  mentioned
>> in the
>>    httpd.conf          --    Regards
>>    Agnello D'souza
>>    www.linux-vashi.blogspot.com <http://www.linux-vashi.blogspot.com>
>>    www.bible-study-india.blogspot.com
>>    <http://www.bible-study-india.blogspot.com>
>>
>>
>>
>>
>> --
>> Gaurav Pruthi
>>
>
> MaxClients          500 could be useless (I may be wrong but from what I
> know is a hard coded limit in apache source code HARD_SERVER_LIMIT who is
> set to 250 so if you want to raise that limit you must recompile your
> apache)
>
> MaxRequestsPerChild   0 it say that once a child is created he can stay up
> and running for infinite time. It could be better to limit this , let say to
> 10000 in order to force apache to kill a stressed child and start a fresh
> one.
>
> MinSpareServers      25 in my opinion is a little bit high. Practically you
> force apache to keep free 25 servers any time. Try to set this parameter to
> something like 10 or 15
>
> Ther is a lot of literature about those parameters and how is the best way
> to set them bun ther is not a clear solutions so the best practice is to
> start playing with them and look for what happen.
>
>
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>


-- 
Gaurav Pruthi

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