Hi, I am running Cassandra over Linux VMs, each VM is: 2GB RAM, 4 core CPU. Using RPM distribution. I have set -Xmx to 512M in cassandra-env.sh
After day of running I see that Cassandra process is utilizing over 80% of memory that is 3 times more then 512M. In result after 2 days of running, Cassandra process is killed by OS (without OutOfMemoryException). Here is *ps aux* output. Could you help to understand this behavior? USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND 103 1067 2.5 * 80.7 6417932* *1693508* ? SLl 01:06 24:30 * /usr/java/jre1.6.0_26/bin/java* -ea -javaagent:/usr/share/cassandra//lib/jamm-0.2.2.jar -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 *-Xms512M -Xmx512M -Xmn128M*-XX:+HeapDumpOnOutOfMemoryError -Xss128k -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:SurvivorRatio=8 -XX:MaxTenuringThreshold=1 -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -Djava.net.preferIPv4Stack=true -Dcom.sun.management.jmxremote.port=7199 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dlog4j.configuration=log4j-server.properties -Dlog4j.defaultInitOverride=true -Dcassandra-pidfile=/var/run/cassandra/cassandra.pid -cp /etc/cassandra/conf:/usr/share/cassandra/lib/antlr-3.2.jar:/usr/share/cassandra/lib/apache-cassandra-0.8.5.jar:/usr/share/cassandra/lib/apache-cassandra-thrift-0.8.5.jar:/usr/share/cassandra/lib/avro-1.4.0-fixes.jar:/usr/share/cassandra/lib/avro-1.4.0-sources-fixes.jar:/usr/share/cassandra/lib/commons-cli-1.1.jar:/usr/share/cassandra/lib/commons-codec-1.2.jar:/usr/share/cassandra/lib/commons-collections-3.2.1.jar:/usr/share/cassandra/lib/commons-lang-2.4.jar:/usr/share/cassandra/lib/concurrentlinkedhashmap-lru-1.1.jar:/usr/share/cassandra/lib/guava-r08.jar:/usr/share/cassandra/lib/high-scale-lib-1.1.2.jar:/usr/share/cassandra/lib/jackson-core-asl-1.4.0.jar:/usr/share/cassandra/lib/jackson-mapper-asl-1.4.0.jar:/usr/share/cassandra/lib/jamm-0.2.2.jar:/usr/share/cassandra/lib/jline-0.9.94.jar:/usr/share/cassandra/lib/jna.jar:/usr/share/cassandra/lib/json-simple-1.1.jar:/usr/share/cassandra/lib/libthrift-0.6.jar:/usr/share/cassandra/lib/log4j-1.2.16.jar:/usr/share/cassandra/lib/servlet-api-2.5-20081211.jar:/usr/share/cassandra/lib/slf4j-api-1.6.1.jar:/usr/share/cassandra/lib/slf4j-log4j12-1.6.1.jar:/usr/share/cassandra/lib/snakeyaml-1.6.jar org.apache.cassandra.thrift.CassandraDaemon Evgeny.
