Can you paste the output of cfstats and cfhistograms?
 
Also try and get histo at 2 diff points 1) when it looks good 2) when it gets slow
 
http://docs.oracle.com/javase/6/docs/technotes/tools/share/jmap.html
 
Look for jmap -histo

On Thu, Jun 20, 2013 at 12:27 AM, Joel Samuelsson <samuelsson.joel@gmail.com> wrote:
12.3 GB data per node (only one ņode).
16GB RAM.
In virtual environment with the CPU specified as "8 cores", average CPU use is close to 0% (basically no load, around 12 requests / sec, mostly from OpsCenter).
Average memory use is 4GB. Around 1GB heap used by Cassandra (out of 4GB).


2013/6/19 Mohit Anchlia <mohitanchlia@gmail.com>
How much data do you have per node?
How much RAM per node?
How much CPU per node?
What is the avg CPU and memory usage?

On Wed, Jun 19, 2013 at 12:16 AM, Joel Samuelsson <samuelsson.joel@gmail.com> wrote:
My Cassandra ps info:

root     26791     1  0 07:14 ?        00:00:00 /usr/bin/jsvc -user cassandra -home /opt/java/64/jre1.6.0_32/bin/../ -pidfile /var/run/cassandra.pid -errfile &1 -outfile /var/log/cassandra/output.log -cp /usr/share/cassandra/lib/antlr-3.2.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-lang-2.6.jar:/usr/share/cassandra/lib/compress-lzf-0.8.4.jar:/usr/share/cassandra/lib/concurrentlinkedhashmap-lru-1.3.jar:/usr/share/cassandra/lib/guava-13.0.1.jar:/usr/share/cassandra/lib/high-scale-lib-1.1.2.jar:/usr/share/cassandra/lib/jackson-core-asl-1.9.2.jar:/usr/share/cassandra/lib/jackson-mapper-asl-1.9.2.jar:/usr/share/cassandra/lib/jamm-0.2.5.jar:/usr/share/cassandra/lib/jbcrypt-0.3m.jar:/usr/share/cassandra/lib/jline-1.0.jar:/usr/share/cassandra/lib/jna.jar:/usr/share/cassandra/lib/json-simple-1.1.jar:/usr/share/cassandra/lib/libthrift-0.7.0.jar:/usr/share/cassandra/lib/log4j-1.2.16.jar:/usr/share/cassandra/lib/lz4-1.1.0.jar:/usr/share/cassandra/lib/metrics-core-2.0.3.jar:/usr/share/cassandra/lib/netty-3.5.9.Final.jar:/usr/share/cassandra/lib/servlet-api-2.5-20081211.jar:/usr/share/cassandra/lib/slf4j-api-1.7.2.jar:/usr/share/cassandra/lib/slf4j-log4j12-1.7.2.jar:/usr/share/cassandra/lib/snakeyaml-1.6.jar:/usr/share/cassandra/lib/snappy-java-1.0.4.1.jar:/usr/share/cassandra/lib/snaptree-0.1.jar:/usr/share/cassandra/apache-cassandra-1.2.5.jar:/usr/share/cassandra/apache-cassandra-thrift-1.2.5.jar:/usr/share/cassandra/apache-cassandra.jar:/usr/share/cassandra/stress.jar:/usr/share/java/jna.jar:/etc/cassandra:/usr/share/java/commons-daemon.jar -Dlog4j.configuration=log4j-server.properties -Dlog4j.defaultInitOverride=true -XX:HeapDumpPath=/var/lib/cassandra/java_1371626058.hprof -XX:ErrorFile=/var/lib/cassandra/hs_err_1371626058.log -ea -javaagent:/usr/share/cassandra/lib/jamm-0.2.5.jar -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms4004M -Xmx4004M -Xmn800M -XX:+HeapDumpOnOutOfMemoryError -Xss180k -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:SurvivorRatio=8 -XX:MaxTenuringThreshold=1 -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+UseTLAB -Djava.net.preferIPv4Stack=true -Dcom.sun.management.jmxremote.port=7199 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false org.apache.cassandra.service.CassandraDaemon
103      26792 26791 99 07:14 ?        854015-22:02:22 /usr/bin/jsvc -user cassandra -home /opt/java/64/jre1.6.0_32/bin/../ -pidfile /var/run/cassandra.pid -errfile &1 -outfile /var/log/cassandra/output.log -cp /usr/share/cassandra/lib/antlr-3.2.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-lang-2.6.jar:/usr/share/cassandra/lib/compress-lzf-0.8.4.jar:/usr/share/cassandra/lib/concurrentlinkedhashmap-lru-1.3.jar:/usr/share/cassandra/lib/guava-13.0.1.jar:/usr/share/cassandra/lib/high-scale-lib-1.1.2.jar:/usr/share/cassandra/lib/jackson-core-asl-1.9.2.jar:/usr/share/cassandra/lib/jackson-mapper-asl-1.9.2.jar:/usr/share/cassandra/lib/jamm-0.2.5.jar:/usr/share/cassandra/lib/jbcrypt-0.3m.jar:/usr/share/cassandra/lib/jline-1.0.jar:/usr/share/cassandra/lib/jna.jar:/usr/share/cassandra/lib/json-simple-1.1.jar:/usr/share/cassandra/lib/libthrift-0.7.0.jar:/usr/share/cassandra/lib/log4j-1.2.16.jar:/usr/share/cassandra/lib/lz4-1.1.0.jar:/usr/share/cassandra/lib/metrics-core-2.0.3.jar:/usr/share/cassandra/lib/netty-3.5.9.Final.jar:/usr/share/cassandra/lib/servlet-api-2.5-20081211.jar:/usr/share/cassandra/lib/slf4j-api-1.7.2.jar:/usr/share/cassandra/lib/slf4j-log4j12-1.7.2.jar:/usr/share/cassandra/lib/snakeyaml-1.6.jar:/usr/share/cassandra/lib/snappy-java-1.0.4.1.jar:/usr/share/cassandra/lib/snaptree-0.1.jar:/usr/share/cassandra/apache-cassandra-1.2.5.jar:/usr/share/cassandra/apache-cassandra-thrift-1.2.5.jar:/usr/share/cassandra/apache-cassandra.jar:/usr/share/cassandra/stress.jar:/usr/share/java/jna.jar:/etc/cassandra:/usr/share/java/commons-daemon.jar -Dlog4j.configuration=log4j-server.properties -Dlog4j.defaultInitOverride=true -XX:HeapDumpPath=/var/lib/cassandra/java_1371626058.hprof -XX:ErrorFile=/var/lib/cassandra/hs_err_1371626058.log -ea -javaagent:/usr/share/cassandra/lib/jamm-0.2.5.jar -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms4004M -Xmx4004M -Xmn800M -XX:+HeapDumpOnOutOfMemoryError -Xss180k -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:SurvivorRatio=8 -XX:MaxTenuringThreshold=1 -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+UseTLAB -Djava.net.preferIPv4Stack=true -Dcom.sun.management.jmxremote.port=7199 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false org.apache.cassandra.service.CassandraDaemon

Is it normal to have two processes like this?