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From Pid <>
Subject Re: Tomcat 5.5/HTTPD cluster question
Date Tue, 28 Dec 2010 13:30:11 GMT
On 12/27/10 4:42 PM, Don Hill wrote:
> Thanks.
> I am trying to get them to migrate. It seems that part of there bottleneck
> could be the MAX clients on HTTPD. They get high volumes at times and have
> like 1800-3000 active sessions. Any other input would be great like tuning
> tomcat to workers and the best strategy to setup a tomcat/httpd env.
> Don
> On Mon, Dec 27, 2010 at 9:34 AM, André Warnier <> wrote:
>> Don Hill wrote:
>>> Hi.
>>> I am working on a tomcat 5.5 cluster which is using ajp/1.3 and mod_jk and
>>> trying to determine the best cluster design given the hardware. I have 2
>>> xeon 2.3 ghz 2 CPU machines with 38GB ram machine. Currently here is the
>>> config I am using. The TOMCAT and HTTPD servers are on the same physical
>>> machine.
>>> Each machine is running HTTPD 1.3 with prefork, the MaxClients is 256 due
>>> compiled in limits. Each machine has 4 virtualhosts running through one
>>> instance of HTTPD. Two of the VHOSTS are the same app running on Tomcat
>>> 5.5
>>> with 8GB RAM(configured by customer). The workers are configured to each
>>> VHOST meaning for each machine there are 4 workers defined and one worker
>>> is defined for each VHOST. I will try and depict this below. The current
>>> load balancing is controlled by F5 and manages the load across 2 machines,
>>> 4
>>> VHOST for each app.
>>> Based on this info can someone recommend if this configuration could be
>>> improved and if so what would you recommend ?
>>>  The very first thing that I would recommend, would be to use the current
>> versions of both httpd and tomcat.  The versions you mention above are
>> several years old, and no longer being developed, except maybe for security
>> patches.
>> See :
>> See :

Are you using a 64bit JVM?
What version is it?
Is your OS a 64bit version?
Which OS is it?


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