1. make startcc/nc scripts flexible for different physical memory size; 2. add dynamic optimization option in the Client
diff --git a/pregelix/pregelix-dist/src/main/resources/scripts/startcc.sh b/pregelix/pregelix-dist/src/main/resources/scripts/startcc.sh
index d7a0ead..e637fde 100644
--- a/pregelix/pregelix-dist/src/main/resources/scripts/startcc.sh
+++ b/pregelix/pregelix-dist/src/main/resources/scripts/startcc.sh
@@ -49,7 +49,22 @@
#Export JAVA_HOME and JAVA_OPTS
export JAVA_HOME=$JAVA_HOME
-export JAVA_OPTS=$CCJAVA_OPTS
+
+#get the OS
+OS_NAME=`uname -a|awk '{print $1}'`
+LINUX_OS='Linux'
+
+if [ $OS_NAME = $LINUX_OS ];
+then
+ MEM_SIZE=`cat /proc/meminfo |grep MemTotal|awk '{print $2}'`
+else
+ MEM_SIZE=`sysctl -a | grep "hw.memsize ="|awk '{print $3}'`
+fi
+
+MEM_SIZE=$(($MEM_SIZE * 3 / 4))
+
+#Set JAVA_OPTS
+export JAVA_OPTS=$CCJAVA_OPTS" -Xmx"$MEM_SIZE
PREGELIX_HOME=`pwd`
diff --git a/pregelix/pregelix-dist/src/main/resources/scripts/startnc.sh b/pregelix/pregelix-dist/src/main/resources/scripts/startnc.sh
index 6727bd5..ef9cfbe 100644
--- a/pregelix/pregelix-dist/src/main/resources/scripts/startnc.sh
+++ b/pregelix/pregelix-dist/src/main/resources/scripts/startnc.sh
@@ -68,13 +68,26 @@
#Get node ID
NODEID=`hostname | cut -d '.' -f 1`
-#Set JAVA_OPTS
-export JAVA_OPTS=$NCJAVA_OPTS
-
PREGELIX_HOME=`pwd`
#Enter the temp dir
cd $NCTMP_DIR
+#get the OS
+OS_NAME=`uname -a|awk '{print $1}'`
+LINUX_OS='Linux'
+
+if [ $OS_NAME = $LINUX_OS ];
+then
+ MEM_SIZE=`cat /proc/meminfo |grep MemTotal|awk '{print $2}'`
+else
+ MEM_SIZE=`sysctl -a | grep "hw.memsize ="|awk '{print $3}'`
+fi
+
+MEM_SIZE=$(($MEM_SIZE * 3 / 4))
+
+#Set JAVA_OPTS
+export JAVA_OPTS=$NCJAVA_OPTS" -Xmx"$MEM_SIZE
+
#Launch hyracks nc
${PREGELIX_HOME}/bin/pregelixnc -cc-host $CCHOST -cc-port $CC_CLUSTERPORT -cluster-net-ip-address $IPADDR -data-ip-address $IPADDR -result-ip-address $IPADDR -node-id $NODEID -iodevices "${IO_DIRS}" &> $NCLOGS_DIR/$NODEID.log &