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Michael Vince <mv@xxxxxxx> · Tue, 06 Dec 2005 21:00:02 +1100

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@f36e59, 
terminatingthread
I have been testing with my libmap.conf with these different types of 
implementations.
[/usr/local/jdk1.4.2/]
#libpthread.so           libc_r.so
#libpthread.so.2           libc_r.so.6
libpthread.so.2         libthr.so.2
libpthread.so           libthr.so
libc_r.so.6             libthr.so.2
libc_r.so               libthr.so
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.
kern.threads.max_threads_per_proc=40000
kern.threads.max_groups_per_proc=40000
ps -auxwH | grep -c 'java'
2565
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.

[/usr/local/jdk1.4.2/]

libpthread.so           libc_r.so

libpthread.so.2           libc_r.so.6
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?
Cheers,
Mike

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