I'm getting a lot of questions those days about how to configure Grizzly to get the best performance. In part I, I will share what we have learned so far(thanks to Scott for his help!)

First, if you are using Grizzly in GlassFish, makes sure you remove in domain.xml the following jvm-options:

-Xmx512 -client -Dsun.rmi.dgc.server.gcInterval=3600000
-Dsun.rmi.dgc.client.gcInterval=3600000

and replace it with

-server -XX:+AggressiveHeap -Xmx3500m -Xms3500m -Xss128k
-XX:+DisableExplicitGC
-Dcom.sun.enterprise.server.ss.ASQuickStartup=false

For anything other than Solaris/SPARC, 3500m needs to be 1400m. On a multi-CPU machine, add:

-XX:ParallelGCThreads=N -XX:+UseParallelOldGC

where N is the number of CPUs if < 8 (so really, you can leave it out altogether in that case) and N = number of CPUs / 2 otherwise. On a Niagara, add:

-XX:LargePageSizeInBytes=256m

Et voila!

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