GC tuning

Good article about GC tuning:

http://www.oracle.com/technetwork/java/gc-tuning-5-138395.html#0.0.0.When%20to%20Use%20the%20Throughput%20Collector|outline

JAVA opts to get the gc dat : JAVA_OPTS="$JAVA_OPTS -XX:+UseConcMarkSweepGC -verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -Xloggc:/root/gc.log"