Hi,

Its probably best practice to have a heap size as small as possible. This will reduce 
the thread lockup caused by garbage collection. You can minimise the frequency of full 
collections by modifying the new generation size by setting the 
-XX:NewSize and -XX:MaxNewSize settings also there is -XX:SurvivorRatio which you can 
play around with. Use -verbose:gc switch to see the GC performance.

See 
http://java.sun.com/docs/hotspot/gc1.4.2/

for a detailed description....

Yohan Fernando

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