-XX:CMSInitiatingOccupancyFraction=75 It's at 90 by default on most systems. Turning this down to the above would trigger the incremental collection to occur 75% full as opposed to %90.
-Nate On Wed, Apr 28, 2010 at 7:44 AM, Jonathan Ellis <jbel...@gmail.com> wrote: > Yes, incremental mode is definitely contraindicated for Cassandra. > > On Wed, Apr 28, 2010 at 1:07 AM, Peter Schuller > <peter.schul...@infidyne.com> wrote: >>> -XX:+CMSIncrementalMode \ >>> -XX:+CMSIncrementalPacing \ >> >> This may not be an issue given your other VM opts, but just FYI I >> have had some difficulty making the incremental CMS mode perform GC >> work sufficiently aggressively to avoid concurrent mode failures >> during significant garbage generation. >> >> You may want to give CMS a try in non-incremental mode (i.e., the >> concurrent mark phase will be done in one burst, rather than spread >> out over time, but still concurrently). >> >> -- >> / Peter Schuller >> > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of Riptano, the source for professional Cassandra support > http://riptano.com >
