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Michael Vince mv at
Tue Dec 6 10:00:04 GMT 2005

Hi All,

I been benchmarking a Java servlet I have created and I want to be able 
to handle a massive amount of simultaneous connections.
So far using benchmarking tools I have been able to get around 2,565 
threads on the Tomcat 5.5 Java process (with native 1.4.2 Java) 
according to ps -auxwH | grep -c 'java'

But I just can't seem to get past that mark, I have a lot of memory 
currently the Tomcat is allocated 2gigs of memory.

When I max it out with my benchmarks I get this in catalina Tomcat 5.5 
but there is still plenty of free memory to the Tomcat process.
SEVERE: Caught exception (java.lang.OutOfMemoryError: unable to create 
new native thread) executing org.apache.jk.common.SocketAcceptor at f36e59, 

I have been testing with my libmap.conf with these different types of 


I have been getting the best performance with libthr and have been using 
the above libthr and with these settings below.

I have set my max_threads in /etc/sysctl.conf to a massive amount.


ps -auxwH | grep -c 'java'

I am using Apache2.2 with the new built in AJP module which has been a 
great addition to Apache 2.2.
I have been able to get the setup performing most stable (no 503 status 
errors) but with less performance / threads with the libmap.conf below.

I am on 6.0 Release i386, dual Intel P4, generic SMP kernel.

With Tomcat on Windows XP I have been able to get it running better.
Does any one know of some other sysctls that increase the amount of 
threads in libthr which I am assuming utilizes the above sysctls. Does 
any one know how many threads can be created in Java on FreeBSD?


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