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From "Cammy Ng" <>
Subject Re: Tomcat load estimates/load balancing question
Date Wed, 12 Jun 2002 18:17:37 GMT

Be careful on mod_jk, apache1.3.x and Tomcat 4.x
Apache will use up 100% CPU with 100 concurrent user after 2 hour to 4
hours, I believe there is a bugs on the mod_jk, I did post few message
before, and no one seems to find the solution. For production, use commerce
program until the mod_jk(AJP13) fix the deadlock.


----- Original Message -----
From: "Lucy Marney" <>
To: <>
Sent: Tuesday, June 11, 2002 9:05 PM
Subject: Tomcat load estimates/load balancing question

> Hi all,
> I have a quick question regarding the estimated load of Tomcat 4.0 -
> behind Apache 1.3.22, using the WARP connector, and both on the same
> (Linux).
> I have read alot about the inability of mod_webapp to do serious load
> balancing - I've gathered that production-style scalability can only be
> achieved through the use of the mod_jk connector.
> However, I can't seem to find any explicit estimations of the kind of load
> to be expected when using the above setup - in terms of concurrent servlet
> requests by muliple clients/machines.  How many concurrent connections are
> we talking about here?  Or more specifically, where does the line fall
> between "production use" and "normal use".  I know this is probably a
> personal/context-related issue, but I was interested in just how much you
> can bash Tomcat 4.0 before hassles arise.
> My question is sparked by problems in our own setup, whereby concurrent
> requests for the same servlet result in an internal error (NullPointer
> exception, that was previously not a problem) - after only about 10-15
> consecutive requests each.  I'm still trying to track down any
> of client/server code errors.
> Any thoughts/comments would be greatly appreciated.
> Thanks,
> Lucy
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