#44 vjstar，建议的JDK参数设定脚本

vjstar/src/main/script/jvm-options.sh

@@ -0,0 +1,98 @@
+
+#!/bin/bash
+
+
+LOGDIR="./"
+
+JAVA_VERSION=$(java -version 2>&1 | awk -F '"' '/version/ {print $2}')
+
+
+#enable coredump
+ulimit -c unlimited
+
+## Memory
+
+MEM_OPTS="-Xms4g -Xmx4g -XX:NewRatio=1 -XX:+AlwaysPreTouch"
+
+
+if [[ "$JAVA_VERSION" < "1.8" ]]; then
+  MEM_OPTS="$MEM_OPTS -XX:PermSize=256m -XX:MaxPermSize=512m"
+else         
+  MEM_OPTS="$MEM_OPTS -XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=512m"
+fi
+
+
+#MEM_OPTS="$MEM_OPTS -Xss256k"
+
+#MEM_OPTS_="$MEM_OPTS -XX:ReservedCodeCacheSize=240M"
+
+
+## GC 
+
+GC_OPTS="-XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:MaxTenuringThreshold=4 -XX:+UseCMSInitiatingOccupancyOnly"
+GC_OPTS="$GC_OTPS -XX:+ExplicitGCInvokesConcurrent -XX:+ParallelRefProcEnabled -XX:+CMSParallelInitialMarkEnabled"
+GC_OPTS="$GC_OTPS -XX:+UnlockDiagnosticVMOptions -XX:ParGCCardsPerStrideChunk=1024"
+
+
+#GC_OPTS="$GC_OTPS -XX:ParallelGCThreads=16 -XX:ConcGCThreads=8"
+
+if [[ "$JAVA_VERSION" > "1.8" ]]; then     
+  #GC_OPTS="$GC_OPTS -XX:-CMSClassUnloadingEnabled"
+fi
+
+
+## GC LOG
+
+if [ -d /dev/shm/ ]; then
+    GC_LOG_FILE=/dev/shm/gc-myapp.log
+else
+	GC_LOG_FILE=${LOGDIR}/gc-myapp.log
+fi
+
+
+if [ -f ${GC_LOG_FILE} ]; then
+  GC_LOG_BACKUP =  ${LOGDIR}/gc-myapp-$(date +'%Y%m%d_%H%M%S').log
+  echo "saving gc log ${GC_LOG_FILE} to ${GC_LOG_BACKUP}"
+  mv ${GC_LOG_FILE} ${GC_LOG_BACKUP}
+fi
+
+GCLOG_OPTS="-Xloggc:${GC_LOG_FILE} -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCApplicationStoppedTime -XX:+PrintPromotionFailure"
+
+if [[ "$JAVA_VERSION" < "1.8" ]]; then
+	GCLOG_OPTS="$GCLOG_OPTS -XX:+PrintGCCause"
+fi
+
+
+# Performance 
+
+PERFORMANCE_OPTS=" -XX:-UseBiasedLocking -XX:AutoBoxCacheMax=20000 -Djava.security.egd=file:/dev/./urandom"
+
+#PERFORMANCE_OPTS="$PERFORMANCE_OPTS -XX:-UseCounterDecay"
+
+#PERFORMANCE_OPTS="$PERFORMANCE_OPTS -XX:+PerfDisableSharedMem"
+
+if [[ "$JAVA_VERSION" > "1.8" ]]; then     
+  #PERFORMANCE_OPTS="$PERFORMANCE_OPTS -XX:-TieredCompilation"
+fi
+
+
+# Error Detecting
+
+ERROR_OPTS="-XX:+PrintCommandLineFlags -XX:-OmitStackTraceInFastThrow -XX:ErrorFile=${LOGDIR}/hs_err_%p.log"
+
+#ERROR_OPTS="$ERROR_OPTS -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=${LOGDIR}/"
+
+
+# JMX
+
+JMX_OPTS="-Djava.rmi.server.hostname=127.0.0.1 -Dcom.sun.management.jmxremote.port=7001 -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false"
+
+
+# Other
+
+OTHER_OPTS="-Djava.net.preferIPv4Stack=true"
+
+
+
+#ALL
+JAVA_OTPS="$MEM_OPTS $GC_OPTS $GC_LOG_OPTS $PERFORMANCE_OPTS $ERROR_OPTS $JMX_OPTS $OTHER_OPTS"