# check if /dev/shm exists on other systems
if [ -d "/dev/shm" ]; then
GC_LOG_DIR="/dev/shm"
else
GC_LOG_DIR=${BASE_DIR}
fi
;;
esac
}
# 主要修改JAVA_OPT 内存大小
choose_gc_options()
{
# Example of JAVA_MAJOR_VERSION value : '1', '9', '10', '11', ...
# '1' means releases befor Java 9
JAVA_MAJOR_VERSION=$("$JAVA" -version 2>&1 | sed -r -n 's/.* version
"([0-9]*).*$/\1/p')
if [ -z "$JAVA_MAJOR_VERSION" ] || [ "$JAVA_MAJOR_VERSION" -lt "9" ]
; then
JAVA_OPT="${JAVA_OPT} -server -Xms1g -Xmx1g -Xmn512m -
XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m"
JAVA_OPT="${JAVA_OPT} -XX:+UseConcMarkSweepGC -
XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=70
-XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -
XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8 -XX:-UseParNewGC"
JAVA_OPT="${JAVA_OPT} -verbose:gc -
Xloggc:${GC_LOG_DIR}/rmq_srv_gc_%p_%t.log -XX:+PrintGCDetails -
XX:+PrintGCDateStamps"
JAVA_OPT="${JAVA_OPT} -XX:+UseGCLogFileRotation -
XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=30m"
else
JAVA_OPT="${JAVA_OPT} -server -Xms1g -Xmx1g -XX:MetaspaceSize=128m
-XX:MaxMetaspaceSize=320m"
JAVA_OPT="${JAVA_OPT} -XX:+UseG1GC -XX:G1HeapRegionSize=16m -
XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30 -
XX:SoftRefLRUPolicyMSPerMB=0"
JAVA_OPT="${JAVA_OPT} -
Xlog:gc*:file=${GC_LOG_DIR}/rmq_srv_gc_%p_%t.log:time,tags:filecount=5,f
ilesize=30M"
fi
}
export JAVA_HOME
export JAVA="$JAVA_HOME/bin/java"
export BASE_DIR=$(dirname $0)/..
export CLASSPATH=.:${BASE_DIR}/conf:${BASE_DIR}/lib/*:${CLASSPATH}
#=======================================================================
====================
# JVM Configuration
#=======================================================================
====================
# The RAMDisk initializing size in MB on Darwin OS for gc-log
