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From ganesh ganesh <ganeshapa...@gmail.com>
Subject Re: [users@httpd] Apache 2 problems with spawning processes
Date Mon, 02 Feb 2009 16:14:12 GMT
Hi,

Without complete interrogation i wont be able to provide you the exact
answer.. but the immediate suggestion i can suggest you is disable the
KeepAlive:

KeepAlive Off

and restart your apache... let me know how it goes...  also the max
keepalive reqeust  is i think a bit too much taking in to consideration no
of child process that can be spawned based on the parents


Regards,
Ganesh,
*ganesh@efficeasy.com*

On Fri, Jan 30, 2009 at 7:48 PM, anebi@iguanait.com <anebi@iguanait.com>wrote:

> Hi,
>
> we have installed apache 2 on centos 5 system and we have a big problem
> with spawning too much child processes. These are the versions that we
> use:
>
>
> Centos 5.2 x86_64
> httpd-2.2.8-jason.3
> php-5.2.6-1.el5.remi
> mysql-5.0.45-7.el5
>
> System has 2xquat processor (total 8 cores) and 16 GB RAM
>
>
> We have this configuration for prefork MPM and timeouts:
>
> #
> # Timeout: The number of seconds before receives and sends time out.
> #
> Timeout 100
>
> #
> # KeepAlive: Whether or not to allow persistent connections (more than
> # one request per connection). Set to "Off" to deactivate.
> #
> KeepAlive On
>
> #
> # MaxKeepAliveRequests: The maximum number of requests to allow
> # during a persistent connection. Set to 0 to allow an unlimited amount.
> # We recommend you leave this number high, for maximum performance.
> #
> MaxKeepAliveRequests 500
>
> #
> # KeepAliveTimeout: Number of seconds to wait for the next request from
> the
> # same client on the same connection.
> #
> KeepAliveTimeout 2
>
> ##
> ## Server-Pool Size Regulation (MPM specific)
> ##
>
> # prefork MPM
> # StartServers: number of server processes to start
> # MinSpareServers: minimum number of server processes which are kept
> spare
> # MaxSpareServers: maximum number of server processes which are kept
> spare
> # ServerLimit: maximum value for MaxClients for the lifetime of the
> server
> # MaxClients: maximum number of server processes allowed to start
> # MaxRequestsPerChild: maximum number of requests a server process
> serves
> <IfModule prefork.c>
> StartServers       5
> MinSpareServers    5
> MaxSpareServers   20
> ServerLimit      250
> MaxClients       250
> MaxRequestsPerChild  5000
> </IfModule>
>
> Apache and mysql works fine around 20 hours, and then in some moment
> apache start to spawn a lot of processes until stop to handle requests.
>
> I checked with top,mytop,apachetop our system and what i saw is this.
> When this happen apachetop (parse server-status result) shows that there
> are a lot of requests with "W" mode and at the same time i see a lot of
> not finished threads and queries in mytop (run time monitoring of
> mysql).
>
> In top and other system monitoring tools i see that memory is ok. There
> is enough free memory. System does not swap, but CPU usage from mysql
> and apache is getting too high. Apache is spawning and mysql cannot
> handle these requests. It use also too much CPU during this time.
>
> What i cannot understand is why there are so many requests with "W" mode
> in server-status page. Of course this is not happen every time. Maybe 2
> times per day, but i need to find out why this happen and to try to fix
> this problem.
>
> What can be the problem, how to troubleshoot this and undestand what
> exactly happens?
>
> Thanks in advanced!
>
> Regards, Ali Nebi!
>
>
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-- 
Regards,
GANESH.

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