[ISSUE #3030]Remove the -Xmn JVM parameter when using G1 (#3170)

Co-authored-by: Nzhangjidi2016 <zhangjidi@cmss.chinamobile.com>

distribution/bin/runbroker.cmd

@@ -28,7 +28,7 @@ set CLASSPATH=.;%BASE_DIR%conf;%CLASSPATH%
 rem ===========================================================================================
 rem  JVM Configuration
 rem ===========================================================================================
-set "JAVA_OPT=%JAVA_OPT% -server -Xms2g -Xmx2g -Xmn1g"
+set "JAVA_OPT=%JAVA_OPT% -server -Xms2g -Xmx2g"
 set "JAVA_OPT=%JAVA_OPT% -XX:+UseG1GC -XX:G1HeapRegionSize=16m -XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30 -XX:SoftRefLRUPolicyMSPerMB=0 -XX:SurvivorRatio=8"
 set "JAVA_OPT=%JAVA_OPT% -verbose:gc -Xloggc:%USERPROFILE%\mq_gc.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCApplicationStoppedTime -XX:+PrintAdaptiveSizePolicy"
 set "JAVA_OPT=%JAVA_OPT% -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=30m"

distribution/bin/runbroker.sh

@@ -64,7 +64,7 @@ choose_gc_log_directory()
 
 choose_gc_log_directory
 
-JAVA_OPT="${JAVA_OPT} -server -Xms8g -Xmx8g -Xmn4g"
+JAVA_OPT="${JAVA_OPT} -server -Xms8g -Xmx8g"
 JAVA_OPT="${JAVA_OPT} -XX:+UseG1GC -XX:G1HeapRegionSize=16m -XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30 -XX:SoftRefLRUPolicyMSPerMB=0"
 JAVA_OPT="${JAVA_OPT} -verbose:gc -Xloggc:${GC_LOG_DIR}/rmq_broker_gc_%p_%t.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCApplicationStoppedTime -XX:+PrintAdaptiveSizePolicy"
 JAVA_OPT="${JAVA_OPT} -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=30m"

distribution/bin/runserver.cmd

@@ -28,7 +28,7 @@ set CLASSPATH=.;%BASE_DIR%conf;%CLASSPATH%
 
 set "JAVA_OPT=%JAVA_OPT% -server -Xms2g -Xmx2g -Xmn1g -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m"
 set "JAVA_OPT=%JAVA_OPT% -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8 -XX:-UseParNewGC"
-set "JAVA_OPT=%JAVA_OPT% -verbose:gc -Xloggc:"%USERPROFILE%\rmq_srv_gc.log" -XX:+PrintGCDetails"
+set "JAVA_OPT=%JAVA_OPT% -verbose:gc -Xloggc:"%USERPROFILE%\rmq_srv_gc.log" -XX:+PrintGCDetails -XX:+PrintGCDateStamps"
 set "JAVA_OPT=%JAVA_OPT% -XX:-OmitStackTraceInFastThrow"
 set "JAVA_OPT=%JAVA_OPT% -XX:-UseLargePages"
 set "JAVA_OPT=%JAVA_OPT% -Djava.ext.dirs=%BASE_DIR%lib;%JAVA_HOME%\jre\lib\ext"

distribution/bin/runserver.sh

@@ -68,18 +68,18 @@ choose_gc_options()
     # '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 -Xms4g -Xmx4g -Xmn2g -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:${GC_LOG_DIR}/rmq_srv_gc_%p_%t.log -XX:+PrintGCDetails"
+      JAVA_OPT="${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="${JAVA_OPT} -server -Xms4g -Xmx4g -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m"
       JAVA_OPT="${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,filesize=30M"
     fi
 }
 
 choose_gc_log_directory
-
-JAVA_OPT="${JAVA_OPT} -server -Xms4g -Xmx4g -Xmn2g -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m"
 choose_gc_options
 JAVA_OPT="${JAVA_OPT} -XX:-OmitStackTraceInFastThrow"
 JAVA_OPT="${JAVA_OPT} -XX:-UseLargePages"