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, *gan...@efficeasy.com* On Fri, Jan 30, 2009 at 7:48 PM, an...@iguanait.com <an...@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! > > > --------------------------------------------------------------------- > The official User-To-User support forum of the Apache HTTP Server Project. > See <URL:http://httpd.apache.org/userslist.html> for more info. > To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org > " from the digest: users-digest-unsubscr...@httpd.apache.org > For additional commands, e-mail: users-h...@httpd.apache.org > > -- Regards, GANESH.
