I'm wondering if anyone has done any tomcat benchmarking with different Hotspot VM settings. Specifically, I'm wondering if -server or -d64 make noticeable differences on the Solaris 8 sparc platform. I have read Sun's documentation about what these settings are supposed to do, but I haven't really seen anything talked about within the context of Tomcat or J2EE.In general, -server will make a huge difference for long running applications, since a lot of the internal optimizations ( such as how often to compile/recompile and how long to cache ) are turned on by the -server/-client switch.
Thanks in advance,
Matt
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On Solaris 8, you can get a little more juice a lot of times by switching to the alternate libthread ( http://java.sun.com/docs/hotspot/threads/threads.html ) and using the 1-1 model. ( This, i believe is the default on Solaris 9 )
There's a lot of options related to garbage collecting, leading one to the obvious conclusion that tuning the GC can provide boosts in performance. There's a lot of good reading at http://java.sun.com/docs/hotspot/.
I don't have any hard numbers, but we were able to do some very postive things, once we found the right information.
HTH, -a
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