chad.brubaker at gmail.com
Tue Dec 6 02:15:22 PST 2005
You can try setting your heap size. JAVA_OPTS="-Xms512M -
Xmx1024M" - actually, in your case you could set the min and max
to be much higher, but this is the command i use on my machine. I'm
pretty sure this is definitely your problem. I upgraded to a machine
with more memory thinking i had solved my OutOfMemeoryError, - but
low and behold, it was my heap size allocation.... hope this helps.
On Dec 6, 2005, at 2:00 AM, Michael Vince wrote:
> 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, terminatingthread
> I have been testing with my libmap.conf with these different types
> of implementations.
> #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.
> 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.
> 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?
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