*) large memory pages will only be used if start script can confirm that Linux supports them or that the OS is Solaris, this should eliminate all sorts of weird behavior including not working shutdown

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@5048 6c8d7289-2bf4-0310-a012-ef5d649a1542

startYACY.sh

@@ -79,7 +79,32 @@ done
 
 #get javastart args
 #JAVA_ARGS="";
-JAVA_ARGS="-server -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:+UseAdaptiveSizePolicy -XX:+UseLargePages";
+
+#check if Linux system supports large memory pages or if OS is Solaris which 
+#supports large memory pages since version 9 
+#(according to http://java.sun.com/javase/technologies/hotspot/largememory.jsp)
+ENABLEHUGEPAGES=0;
+
+if [ $OS = "Linux" ]
+then
+    HUGEPAGESTOTAL="`cat /proc/meminfo | grep HugePages_Total | sed s/[^0-9]//g`"
+    if [ -n "$HUGEPAGESTOTAL" ] && [ $HUGEPAGESTOTAL -ne 0 ]
+    then 
+        ENABLEHUGEPAGES=1
+    elif [ $OS = "SunOS" ]
+    then
+        ENABLEHUGEPAGES=1
+    fi
+fi 
+
+
+JAVA_ARGS="-server -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:+UseAdaptiveSizePolicy";
+#turn on support for large memory pages if supported by OS
+if [ $ENABLEHUGEPAGES -eq 1 ]
+then
+    JAVA_ARGS="$JAVA_ARGS -XX:+UseLargePages"
+fi
+
 #JAVA_ARGS="-verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails $JAVA_ARGS";
     
 if [ ! -f $CONFIGFILE -a -f DATA/SETTINGS/httpProxy.conf ]