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From justin wright <juston_rit...@yahoo.com>
Subject Re: [users@httpd] Re: High volume issues using mod_proxy (balancer,http,ajp) on Apache 2.2.4 across multiple tomcat 5.5.23 clusters - Configuration issues or bugs?
Date Wed, 23 May 2007 18:49:38 GMT
I've set the apache confs to use the following

    StartServers         512
    ServerLimit          1024
    MaxClients           1024
    MinSpareServers      256
    MaxSpareServers      512
    MaxRequestsPerChild  100000


I reran the test with a smaller load (350 users as opposed to 1250).  It didn't hit the server
limit but I still get this error:

[Wed May 23 07:30:54 2007] [error] (70014)End of file found: ajp_ilink_receive() can't receive
header
[Wed May 23 07:30:54 2007] [error] ajp_read_header: ajp_ilink_receive failed
[Wed May 23 07:30:54 2007] [error] (120006)APR does not understand this error code: proxy:
read response failed from (null) (xxx.xxx.xxx.xxx)


Any other suggestions?



----- Original Message ----
From: Jim Jagielski <jim@jaguNET.com>
To: users@httpd.apache.org
Sent: Wednesday, May 23, 2007 12:51:11 PM
Subject: Re: [users@httpd] Re: High volume issues using mod_proxy (balancer,http,ajp) on Apache
2.2.4 across multiple tomcat 5.5.23 clusters - Configuration issues or bugs?


Some pointers:

    MaxRequestsPerChild 512
    This means that after an Apache child process handles
    512 requests, it will be killed off (and a replacement will
    need to be forked). With 45+ million request per
    hour, that's a lot of forking.

    Min/MaxSpareServers 512
    You are telling Apache that you want between 512
    and 512 idle Apache processes. If you have more,
    kill them off; less, add more. Can you see the
    issue with this? :)

    (actually, Apache internally tries to handle
     this misconfig by setting Max to 513, but
     still, that's a REAL NARROW BAND)

On May 23, 2007, at 1:41 PM, justin wright wrote:

> When I use the default settings apache immediately complains that  
> it reaches the server limit.  Therefore, I kept raising the limits  
> until I reached the configuration listed below and still the CPU  
> utilization on the apache box is less than 10% (Its a quad AMD box  
> with plenty of memory).  I've spent the past month pouring through  
> the documents trying to figure out how to configure these  
> settings.  What would you suggest for a high-volume site that can  
> serve up 45+ million requests in an hour?
>
>
> ----- Original Message ----
> From: Jim Jagielski <jim@jaguNET.com>
> To: users@httpd.apache.org
> Sent: Wednesday, May 23, 2007 12:29:31 PM
> Subject: Re: [users@httpd] Re: High volume issues using mod_proxy  
> (balancer,http,ajp) on Apache 2.2.4 across multiple tomcat 5.5.23  
> clusters - Configuration issues or bugs?
>
>
> On May 23, 2007, at 1:23 PM, justin wright wrote:
>
>>
>> <IfModule mpm_prefork_module>
>> StartServers 512
>> ServerLimit 1024
>> MaxClients 1024
>> MinSpareServers 512
>> MaxSpareServers 512
>> MaxRequestsPerChild 512
>> </IfModule>
>>
>
> I would suggest reading at least *some* of the documents
> on how to configure Apache. Apache is spending
> loads of time thrashing and killing/creating processes
> that it's a wonder it's working at all.
>
>
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