Re: Load Increases due to Apache

Alexandru David Constantinescu <aldavx@xxxxxxxxx> · Fri, 29 Aug 2008 12:23:20 +0300

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@xxxxxxxxx <mailto:agnello.dsouza@xxxxxxxxx>> wrote:

    On 8/29/08, *Gaurav Pruthi* <gkpruthi@xxxxxxxxx
    <mailto:gkpruthi@xxxxxxxxx>> 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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