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From Apache Wiki <>
Subject [Cassandra Wiki] Update of "PerformanceTuning" by JonathanEllis
Date Wed, 30 Jun 2010 02:04:11 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.

The "PerformanceTuning" page has been changed by JonathanEllis.


+ Useful JVM options:
+         -XX:+UseCompressedOops (for Sun JVM)
+         -Xcompressedrefs (for IBM)
+ Compressed references (aka OOPs = ordinary object pointers) are not stable for Sun JVM versions
before 6u19.
  todo: describe how top, iostat -x, and JMX stats can help you see what is making things
  For starters, see "[[|Linux
Performance Basics for Cassandra]]".

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