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WO JVM Settings
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WO JVM Settings


  • Subject: WO JVM Settings
  • From: Dov Rosenberg <email@hidden>
  • Date: Mon, 20 Apr 2009 13:26:10 -0400
  • Thread-topic: WO JVM Settings

Title: WO JVM Settings
Does anyone have any input on the impact of various JVM settings? Some of our professional services folks have offered up some of their opinions but I can’t really judge if they are correct. Here are the recommendations some of our folks have been implementing.

-server -ms1400M -mx1400M -XX:+PrintGCDetails -XX:+UseCMSCompactAtFullCollection -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:CMSFullGCsBeforeCompaction=0 -XX:+CMSParallelRemarkEnabled -XX:+AggressiveHeap -XX:NewSize=100m -XX:MaxNewSize=100m -XX:MaxPermSize=128m

Questions:
  • For a long running WO app that utilizes EO’s which of the heaps would be best to adjust?
  • Are there any “rules of thumb” regarding sizing versus performance and garbage collection for WO/EOF based apps?

I have not done enough investigation to know the affects of larger/smaller NewSize, or the use of changing survivor ratio’s and messing with how the objects move towards the tenured generations as I would think the cached EO objects might be promoted to live there. Any thoughts would be greatly appreciated.


Thanks in advance

Dov Rosenberg
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