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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.
