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Like the guide says the values are very specific to your environment.
Whats the RAM in your box.
Also are you using Sun JVM or JRockit?
we using Sun JVM and habe two test environments. One with 12GB and the other with 5GB RAM.
we try different USER_MEM_ARGS and use this one:
USER_MEM_ARGS="-Xms512m -Xmx1536m -Xss256k -XX:+UseParallelGC -XX:GCHeapFreeLimit=20 -XX:PermSize=128m -XX:MaxPermSize=512m -XX:NewSize=128m -XX:MaxNewSize=256m -XX:SurvivorRatio=5"
Till now we have no more out of memory exception.