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From Apache Wiki <>
Subject [Cassandra Wiki] Update of "PerformanceTuning" by JonathanEllis
Date Wed, 30 Jun 2010 02:09:12 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)
+ {{{
+ -XX:+UseCompressedOops # enables compressed references, reducing memory overhead on 64bit
+ }}}
+ See and
for discussion on the Sun and IBM JVMs, respectively.
  Compressed references (aka OOPs = ordinary object pointers) are not stable for Sun JVM versions
before 6u19.

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