Filippo Giunchedi has submitted this change and it was merged. Change subject: Reduce the pressure on CMS GC to avoid stop-the-world ......................................................................
Reduce the pressure on CMS GC to avoid stop-the-world Increase the JVM tenuring threshold & lower CMSInitiatingOccupancyFraction. During heavy read load the promotion rate from the young generation is too high for incremental CMS, which causes CMS to switch to slow stop-the world collections that take multiple seconds. This is slow enough for other nodes to consider the node dead. This patch increases the number of young space collections an object needs to survive before being promoted. This increases the cost in young space collections slightly in exchange for a lower promotion rate Additionally, the lower CMSInitiatingOccupancyFraction setting causes CMS to start collections earlier. This gives incremental collection a better shot at collecting sufficient garbage to avoid having to resort to a stop-the-world collection. Change-Id: I26c946e05e651ccd68c767ffba51d2ff9598d87b --- M templates/cassandra-env.sh.erb 1 file changed, 2 insertions(+), 2 deletions(-) Approvals: Filippo Giunchedi: Verified; Looks good to me, approved diff --git a/templates/cassandra-env.sh.erb b/templates/cassandra-env.sh.erb index 2fd9aa4..5a778b8 100644 --- a/templates/cassandra-env.sh.erb +++ b/templates/cassandra-env.sh.erb @@ -218,8 +218,8 @@ JVM_OPTS="$JVM_OPTS -XX:+UseConcMarkSweepGC" JVM_OPTS="$JVM_OPTS -XX:+CMSParallelRemarkEnabled" JVM_OPTS="$JVM_OPTS -XX:SurvivorRatio=8" -JVM_OPTS="$JVM_OPTS -XX:MaxTenuringThreshold=1" -JVM_OPTS="$JVM_OPTS -XX:CMSInitiatingOccupancyFraction=75" +JVM_OPTS="$JVM_OPTS -XX:MaxTenuringThreshold=10" +JVM_OPTS="$JVM_OPTS -XX:CMSInitiatingOccupancyFraction=45" JVM_OPTS="$JVM_OPTS -XX:+UseCMSInitiatingOccupancyOnly" JVM_OPTS="$JVM_OPTS -XX:+UseTLAB" JVM_OPTS="$JVM_OPTS -XX:CompileCommandFile=$CASSANDRA_CONF/hotspot_compiler" -- To view, visit https://gerrit.wikimedia.org/r/192760 To unsubscribe, visit https://gerrit.wikimedia.org/r/settings Gerrit-MessageType: merged Gerrit-Change-Id: I26c946e05e651ccd68c767ffba51d2ff9598d87b Gerrit-PatchSet: 2 Gerrit-Project: operations/puppet/cassandra Gerrit-Branch: master Gerrit-Owner: GWicke <gwi...@wikimedia.org> Gerrit-Reviewer: Alexandros Kosiaris <akosia...@wikimedia.org> Gerrit-Reviewer: Faidon Liambotis <fai...@wikimedia.org> Gerrit-Reviewer: Filippo Giunchedi <fgiunch...@wikimedia.org> Gerrit-Reviewer: GWicke <gwi...@wikimedia.org> Gerrit-Reviewer: Giuseppe Lavagetto <glavage...@wikimedia.org> Gerrit-Reviewer: Manybubbles <never...@wikimedia.org> Gerrit-Reviewer: Mobrovac <mobro...@wikimedia.org> Gerrit-Reviewer: Ottomata <o...@wikimedia.org> Gerrit-Reviewer: Smalyshev <smalys...@wikimedia.org> _______________________________________________ MediaWiki-commits mailing list MediaWiki-commits@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/mediawiki-commits
