Gary Benson wrote: > Hi all, > > I've been working on building Tomcat and its dependencies to native > code with gcj, and I'm interested to see how it compares against > Tomcat running under a 'normal' JVM. Now, I'm well aware that > benchmarks are not a real-world indicator of performance, but I don't > have any particular web application to test and I was wondering if > anyone has a benchmarking suite that they can point me at.
My benchmarks ( > 1 yr ago ) showed GCJ-based tomcat to be as fast as the IBM JDK1.3 ( the fastest VM at that time ). There were small differences under different loads - but the garbage collector seemed like the biggest factor ( GCJ performed worse on JSP pages where more objects were created if I remember correctly ). The amazing thing was the startup time - almost 0 ( it felt more like apache :-). BTW - GCJ is not a virtual machine and doesn't have a JIT - it is a ahead-of-time compiler, just like C and C++ compilers. My understanding is that it compiles Java code to the same intermediary-code as C++ - so you shouldn't see any major difference between C++ code and Java code compiled with GCJ. Except that GCJ programs use garbage collection and java libraries - with the good and the bads. The biggest problem at that time was dynamic class loading. GCJ has a small interpretor and could load servlets - but the difference in performance between precompiled code and interpretor was significant. Another problem was that not everything compiled, I had to do some tricks ( now it shouldn't be a problem ). Also the tests were made with tomcat 3.3 - I tried to compile 4.0 but there were more compile problems. Costin > > In case you are interested in the gcj-built packages, they are > available at http://people.redhat.com/gbenson/naoko/ as source rpms > and as binary rpms compiled for Red Hat Linux 9. Everything except > the webapps is compiled to native code; the webapps are basically > unmodified and are interpreted just as they would be with a normal JVM. > > Thanks, > Gary > > [ [EMAIL PROTECTED] ][ GnuPG 85A8F78B ][ http://inauspicious.org/ ] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
