Yup native threads doing blocking IO on linux is expensive. Things start looking progressively ugly from 50 connections upwards. If you move to NIO you will see a significant improvement in both stability/predictability and performance.
What would make it easier for you to try the multiplexing IO feature instead? regards calvin Marco Trevisan wrote: > > Hello all, > > I also use Tomcat (v4.0.4), and I have run my webapp with a variety of > JVMs in order to find which is best in terms of performance. > It could be important to point that my Java code conforms to the 1.3 API > specification, no 1.4-exclusive class or method is used. > > I found out that the best performing JVM on a single-processor Linux > machine is Blackdown-1.3.1 with green threads and the OpenJIT compiler. > Other JVMs I tried are: IBM v1.3.0 - 1.3.1, Sun v1.3.1 - 1.4.x > > It was a surprise for me to find out such a result, infact some > benchmark classes I've done in order to measure pure processing power > showed the IBM JDK as the best performer: nevertheless, when it comes to > running my webapp under Tomcat, Blackdown 1.3.1 with green threads and > OpenJIT makes it run _noticeably_ faster. > > Consequently, I surfed the net in order to find some command-line > options to pass to the JVM in order to increase native threading > scalability, but I didn't find anything useful. > > I looked at the NGPT home page, surfed the net and found some > interesting benchmarks : > http://www.opengroup.org/rtforum/jan2002/slides/linux/abt.pdf . > > At http://www.ibm.com/developerworks/oss/pthreads/, they say: "This > release is fully suitable as a replacement for LinuxThreads by either a > single user or group or an entire distribution." > Does it mean that if I patch the kernel and install it on my system, my > JVM will use it? I guess it's not so easy :-) > > Bye, > Marco Trevisan > > ---------------------------------------------------------------------- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] ---------------------------------------------------------------------- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
