修改Tomcat的jvm的垃圾回收GC方式为CMS

修改Tomcat的jvm的垃圾回收GC方式

cp $TOMCAT_HOME/bin/catalina.sh $TOMCAT_HOME/bin/catalina.sh.bak_20170815

vi $TOMCAT_HOME/bin/catalina.sh

vi catalina.sh

if [ -z "$JSSE_OPTS" ] ; then
  JSSE_OPTS="-Djdk.tls.ephemeralDHKeySize=2048"
fi

JVM_OPTS="-server -verbose:gc
  -XX:+PrintGCDateStamps
  -XX:+PrintGCDetails
  -XX:+UseGCLogFileRotation
  -XX:NumberOfGCLogFiles=9
  -XX:GCLogFileSize=256m
  -XX:+UseParNewGC
  -XX:+UseConcMarkSweepGC
  -XX:+CMSParallelRemarkEnabled
  -XX:CMSInitiatingOccupancyFraction=70
  -XX:+CMSClassUnloadingEnabled
  -XX:CMSMaxAbortablePrecleanTime=300
  -XX:+CMSScavengeBeforeRemark
  -XX:GCTimeRatio=19
  -XX:SurvivorRatio=3
"
JVM_OPTS="-Xmx16g -Xms4g -Xmn512m $JVM_OPTS  -Xloggc:$CATALINA_TMPDIR/jenkins_gc.log"
JAVA_OPTS="$JAVA_OPTS $JVM_OPTS $JSSE_OPTS -Dmail.smtp.starttls.enable=true -Dmail.smtp.auth=true -Dmail.smtp.ssl.trust=mail.service.mtime.com"