java_opts

对于JVM设置，可以查考如下配置example：

# Memory configuration

JAVA_OPTS="-server" JAVA_OPTS="$JAVA_OPTS -Xms1280m"

JAVA_OPTS="$JAVA_OPTS -Xmx1280m"

JAVA_OPTS="$JAVA_OPTS -XX:NewSize=640m"

JAVA_OPTS="$JAVA_OPTS -XX:MaxNewSize=640m"

JAVA_OPTS="$JAVA_OPTS -XX:SurvivorRatio=5"

JAVA_OPTS="$JAVA_OPTS -XX:TargetSurvivorRatio=90"

JAVA_OPTS="$JAVA_OPTS -XX:MaxTenuringThreshold=12"

JAVA_OPTS="$JAVA_OPTS -XX:+UseConcMarkSweepGC"

JAVA_OPTS="$JAVA_OPTS -XX:+CMSIncrementalMode"

JAVA_OPTS="$JAVA_OPTS -XX:+CMSIncrementalPacing"

JAVA_OPTS="$JAVA_OPTS -XX:+CMSParallelRemarkEnabled"

JAVA_OPTS="$JAVA_OPTS -XX:+UseParNewGC"

JAVA_OPTS="$JAVA_OPTS -XX:PermSize=64m"

JAVA_OPTS="$JAVA_OPTS -XX:MaxPermSize=64m"

JAVA_OPTS="$JAVA_OPTS -XX:+UseTLAB"

# Enable class unloading (needed with ConcMarkSweepGC

JAVA_OPTS="$JAVA_OPTS -XX:+CMSClassUnloadingEnabled"

JAVA_OPTS="$JAVA_OPTS -XX:+CMSPermGenSweepingEnabled"

# debug and memory tweaks to avoid Hotspot Compiler Failure

JAVA_OPTS="$JAVA_OPTS -XX:+PrintCompilation"

JAVA_OPTS="$JAVA_OPTS -XX:CodeCacheMinimumFreeSpace=2M"

JAVA_OPTS="$JAVA_OPTS -XX:ReservedCodeCacheSize=64M"

JAVA_OPTS="$JAVA_OPTS -XX:CompileCommandFile=/my/portal/bin/hotspot_compiler"

# Enable JMX Remote Monitoring

JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote"

JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.port=9000" JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.ssl=false"

JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.password.file=/my/portal/bin/jmxremote.password"

JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.access.file=/my/portal/bin/jmxremote.access"

 
# turn on some debug for GC only print the distribution when doing tuning

JAVA_OPTS="$JAVA_OPTS -verbose:gc"

JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"

JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"

 #JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"

JAVA_OPTS="$JAVA_OPTS -Xloggc:/my/portal/logs/portal/gc.log"

# Enable remote debugging port

JAVA_OPTS="$JAVA_OPTS -Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n"

JAVA_OPTS= "-server -Xms800m -Xmx800m -XX:PermSize=64M-XX:MaxNewSize=256m -XX:maxPermSize=128m -Djava.awt.headless=true"