OutOfMemoryError - 100 thread limit?

[LeeAnn Pultz]

I have a tomcat server with multiple copies of our web application 
running.  We are running into what seems to be a hard-coded limit on the 
number of threads available to the Tomcat application.

I have added code to our servlet class which prints out the number of 
active threads whenever I initialize the servlet.  On Red Hat Linux boxes, 
whenever we start up enough copies of the servlet to hit 100 active 
threads, we reach an OutOfMemoryError - regardless of the Xms/Xmx settings 
(memory profiling shows that we have plenty of memory available).  On 
Windows XP, 50 seems to be the magic number.

I have tried tweaking Xss parameters, my ulimit command in Linux shows 
"unlimited" - and I have reached the same results with Tomcat 3.3.1, 4.0.28 
and 5.0.28 using Java 1.4.1 and 1.4.2.  When I use WebLogic 8.1 on the same 
Linux box, I reach 241 active threads with no problems whatsoever (stopped 
my testing at that number) so it does not seem to be an o/s limitation, or 
a java limitation - which leads me to believe there is something in Tomcat?

Is the number of threads available to tomcat hard coded somewhere? Is there 
a parameter or configuration setting that I can change to increase this?

If this question is better off posted to the developers list, please 
someone, let me know :)

thanks!
LeeAnn Pultz
ExtraView Corporation
[EMAIL PROTECTED]
831-461-7100 x115 


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