Hi,
I was updating to a newer 0.6.3 and happened to remember that I noticed
back in 0.6.2 there's this change in CHANGES.txt
* improve default JVM GC options (CASSANDRA-1014)
Looking at that ticket, I don't actually see the options listed or a
reason for why they changed. Also, I'm not certain which options are
now recommended for a production system versus what's in the distribution.
The distribution (well svn) for 0.6.x currently has
JVM_OPTS=" \
-ea \
-Xms256M \
-Xmx1G \
-XX:+UseParNewGC \
-XX:+UseConcMarkSweepGC \
-XX:+CMSParallelRemarkEnabled \
-XX:SurvivorRatio=8 \
-XX:MaxTenuringThreshold=1 \
-XX:+HeapDumpOnOutOfMemoryError \
-Dcom.sun.management.jmxremote.port=8080 \
-Dcom.sun.management.jmxremote.ssl=false \
-Dcom.sun.management.jmxremote.authenticate=false"
Now I would assume that for 'production' you want to remove
-ea
and
-XX:+HeapDumpOnOutOfMemoryError
as well as adjust -Xms and Xmx accordingly, but are there any others
which should be tweaked? Is there actually a recommended production
set of values or does it very greatly from installation to installation?
Thanks,
-Anthony
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Anthony Molinaro <[email protected]>
