Dynamically populating the CLM_WAS_CONFIG script with system memory

All,
I think the answering this might benefit alot of people who need to automate the deployment or the CLM Suite via WAS.

In the clm_was_config script you set the JVM arguments in the following code block:


#########################################################
# Java Virtual Machine configurations                   #
#########################################################

servers = AdminTask.listServers('[-serverType APPLICATION_SERVER ]')
if (servers != ['']):
    servers = servers [0:len(servers)].split(lineSeparator)
    for server in servers:
        print "Setting configuration for Application Server " + AdminConfig.showAttribute(server, "name")
        jvm = AdminConfig.list('JavaVirtualMachine', server)
       
        try:
            _excp_ = 0
            result = AdminConfig.modify(jvm, [['initialHeapSize', 4G],['maximumHeapSize', 4G]])
            print "Set initial and max heap size to "heap
        except:
            _type_, _value_, _tbck_ = sys.exc_info()
            result = `_value_`
            _excp_ = 1
        #endTry
        if (_excp_ ):
            print "Error modifying JVM heap size for Appserver "+AdminConfig.showAttribute(server, "name")
            print "Error = "+result
        #endIf
       
        #########################################################
        # Set recommended JVM args                              #
        #########################################################
        try:
            _excp_ = 0
            os_arch = java.lang.System.getProperty('os.arch')
            os_name = java.lang.System.getProperty('os.name')
            is_64 = os_arch.find('64')
            is_Solaris = os_name.find('SunOS')
            is_MacOS = os_name.find('Darwin')
            is_AIX = os_name.find('AIX')
            if (is_64 != -1):
                if ((is_Solaris != -1) or (is_MacOS != -1)):
                    result = AdminConfig.modify(jvm, [['genericJvmArguments', '-Xmx[heap]m -Xms[heap]m -Xmn512m -XX:MaxPermSize=768M -XX:ReservedCodeCacheSize=512M -XX:CodeCacheMinimumFreeSpace=2M']])
                    print "Set JVM args -Xmx4g -Xms4g -Xmn512m -XX:MaxPermSize=768M -XX:ReservedCodeCacheSize=512M -XX:CodeCacheMinimumFreeSpace=2M"
                elif (is_AIX != -1):
                    result = AdminConfig.modify(jvm, [['genericJvmArguments', '-Xmx4g -Xms4g -Xmn512m -Xgcpolicy:gencon -Xnocompressedrefs']])
                    print "Set JVM args -Xmx4g -Xms4g -Xmn512m -Xgcpolicy:gencon -Xnocompressedrefs"
                else:
                    result = AdminConfig.modify(jvm, [['genericJvmArguments', '-Xmx2g -Xms2g -Xmn512m -Xgcpolicy:gencon -Xcompressedrefs -Xgc:preferredHeapBase=0x100000000 -verbose:gc -Djava.net.preferIPv4Stack=true -XX:MaxDirectMemorySize=1G']])
                    print "Set JVM args -Xmx4g -Xms4g -Xmn512m -Xgcpolicy:gencon -Xcompressedrefs -Xgc:preferredHeapBase=0x100000000 -verbose:gc -Djava.net.preferIPv4Stack=true -XX:MaxDirectMemorySize=1G"
                #endIf
            else:
                result = AdminConfig.modify(jvm, [['genericJvmArguments', '-Xmx1200m']])
                print "Set JVM args -Xmx1200m"
            #endIf
        except:
            _type_, _value_, _tbck_ = sys.exc_info()
            result = `_value_`
            _excp_ = 1
        #endTry
        if (_excp_ ):
            print "Error setting JVM args"
            print "Error = "+result
        #endIf

now what this does is sets your min/max heaps and sets your JVM arguments..
What I am attempting to do is set a dynamically populated variable so when I execute  this script the min/max is set with 50 percent of my system memory...
Would someone who is more familiar with Jython and wsadmin be willing to lend a hand?

What I have come up with is very clumsy and has too many steps..
My os is RHEL..
cat /proc/meminfo |grep -i memtotal | awk '{print $2}'
That displays my total available memory in kb..
so I set that as a system variable called sysmem

I then divide that by 1024 then 1024 again for Gb and then by 2
I am attempting to read that file into a variable that I then use for all of my settings.

There has to be a more elegant way..
Any help would be GREATLY appreciated

regards,
Karl