Date: Tue, 06 Dec 2005 21:00:02 +1100 From: Michael Vince <mv@roq.com> To: freebsd-java@FreeBSD.org Cc: performance@freebsd.org, freebsd-threads@FreeBSD.org Subject: More threads Message-ID: <43956122.5020106@roq.com>
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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, Mikehelp
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