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From Apache Wiki <wikidi...@apache.org>
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.
http://wiki.apache.org/cassandra/PerformanceTuning?action=diff&rev1=3&rev2=4

--------------------------------------------------

  Useful JVM options:
  
-         -XX:+UseCompressedOops (for Sun JVM)
-         -Xcompressedrefs (for IBM)
+ {{{
+ -XX:+UseCompressedOops # enables compressed references, reducing memory overhead on 64bit
JVMs
+ }}}
+ 
+ See http://wikis.sun.com/display/HotSpotInternals/CompressedOops and http://publib.boulder.ibm.com/infocenter/javasdk/v6r0/topic/com.ibm.java.doc.diagnostics.60/diag/understanding/mm_compressed_references.html
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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