1. rocketMQ

    1. -server -Xms8g -Xmx8g -Xmn4g
    2. -XX:+UseG1GC -XX:G1HeapRegionSize=16m -XX:G1ReservePercent=25 
    3. -XX:InitiatingHeapOccupancyPercent=30 -XX:SoftRefLRUPolicyMSPerMB=0 
    4. -XX:SurvivorRatio=8 -XX:+DisableExplicitGC
    5. -verbose:gc -Xloggc:/dev/shm/mq_gc_%p.log -XX:+PrintGCDetails 
    6. -XX:+PrintGCDateStamps -XX:+PrintGCApplicationStoppedTime
    7. -XX:+PrintAdaptiveSizePolicy
    8. -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=30m

  2. 点评 ``` CATALINA_OPTS=”$CATALINA_OPTS -server -Djava.awt.headless=true -Xms2560m -Xmx2560m -Xss512k -XX:PermSize=128m -XX:MaxPermSize=384m -XX:NewSize=1536m -XX:MaxNewSize=1536m -XX:SurvivorRatio=22 -XX:+UseParNewGC -XX:ParallelGCThreads=4 -XX:MaxTenuringThreshold=9 - XX:+UseConcMarkSweepGC -XX:+DisableExplicitGC -XX:+UseCMSInitiatingOccupancyOnly -XX:+ScavengeBeforeFullGC -XX:+UseCMSCompactAtFullCollection -XX:+CMSParallelRemarkEnabled -XX:CMSFullGCsBeforeCompaction=9 -XX:CMSInitiatingOccupancyFraction=60 -XX:+CMSClassUnloadingEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:-ReduceInitialCardMarks -XX:+CMSPermGenSweepingEnabled -XX:CMSInitiatingPermOccupancyFraction=70 -XX:+ExplicitGCInvokesConcurrent -Djava.nio.channels.spi.SelectorProvider=sun.nio.ch.EPollSelectorProvider -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.config.file=”%CATALINA_HOME%\conf\logging.properties” -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCApplicationConcurrentTime -XX:+PrintHeapAtGC -Xloggc:/data/applogs/heap_trace.txt -XX:-HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/data/applogs/HeapDumpOnOutOfMemoryError”

CATALINA_OPTS=”$CATALINA_OPTS -Dcom.sun.management.snmp.port=9998 -Dcom.sun.management.snmp.interface=localhost” CATALINA_OPTS=”$CATALINA_OPTS -Duser.timezone=Asia/Shanghai -Dclient.encoding.override=UTF-8 -Dfile.encoding=UTF-8”

CATALINA_OPTS=”$CATALINA_OPTS -Dclient.encoding.override=UTF-8 -Dfile.encoding=UTF-8 -Duser.language=zh -Duser.region=CN”

CATALINA_OPTS=”$CATALINA_OPTS -Xdebug -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n” ```