Author: jbellis
Date: Wed Aug 25 13:47:14 2010
New Revision: 989105
URL: http://svn.apache.org/viewvc?rev=989105&view=rev
Log:
add XX:CMSInitiatingOccupancyFraction=80 to default GC options; add comments to
thread priority options. patch by jbellis
Modified:
cassandra/trunk/CHANGES.txt
cassandra/trunk/conf/cassandra-env.sh
Modified: cassandra/trunk/CHANGES.txt
URL:
http://svn.apache.org/viewvc/cassandra/trunk/CHANGES.txt?rev=989105&r1=989104&r2=989105&view=diff
==============================================================================
--- cassandra/trunk/CHANGES.txt (original)
+++ cassandra/trunk/CHANGES.txt Wed Aug 25 13:47:14 2010
@@ -31,6 +31,7 @@ dev
* remove keyspace argument from multiget_count (CASSANDRA-1422)
* allow specifying cassandra.yaml location as (local or remote) URL
(CASSANDRA-1126)
+ * added CMSInitiatingOccupancyFraction=80 to default GC options
0.7-beta1
Modified: cassandra/trunk/conf/cassandra-env.sh
URL:
http://svn.apache.org/viewvc/cassandra/trunk/conf/cassandra-env.sh?rev=989105&r1=989104&r2=989105&view=diff
==============================================================================
--- cassandra/trunk/conf/cassandra-env.sh (original)
+++ cassandra/trunk/conf/cassandra-env.sh Wed Aug 25 13:47:14 2010
@@ -31,12 +31,20 @@ JMX_PORT="8080"
# performance benefit (around 5%).
JVM_OPTS="$JVM_OPTS -ea"
+# enable thread priorities, primarily so we can give periodic tasks
+# a lower priority to avoid interfering with client workload
+JVM_OPTS="$JVM_OPTS -XX:+UseThreadPriorities"
+# allows lowering thread priority without being root. see
+# http://tech.stolsvik.com/2010/01/linux-java-thread-priorities-workaround.html
+JVM_OPTS="$JVM_OPTS -XX:ThreadPriorityPolicy=42"
+
# min and max heap sizes should be set to the same value to avoid
# stop-the-world GC pauses during resize, and so that we can lock the
# heap in memory on startup to prevent any of it from being swapped
# out.
JVM_OPTS="$JVM_OPTS -Xms$MAX_HEAP_SIZE"
JVM_OPTS="$JVM_OPTS -Xmx$MAX_HEAP_SIZE"
+JVM_OPTS="$JVM_OPTS -XX:+HeapDumpOnOutOfMemoryError"
# reduce the per-thread stack size to minimize the impact of Thrift
# thread-per-client. (Best practice is for client connections to
@@ -48,11 +56,10 @@ JVM_OPTS="$JVM_OPTS -XX:+UseParNewGC"
JVM_OPTS="$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:+HeapDumpOnOutOfMemoryError"
-JVM_OPTS="$JVM_OPTS -XX:+UseThreadPriorities"
-JVM_OPTS="$JVM_OPTS -XX:ThreadPriorityPolicy=42"
+JVM_OPTS="$JVM_OPTS -XX:MaxTenuringThreshold=1"
+JVM_OPTS="$JVM_OPTS -XX:CMSInitiatingOccupancyFraction=80"
+# jmx
JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.port=$JMX_PORT"
JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl=false"
JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.authenticate=false"
