Expanded permgen to stop chronic full GC problem when running tests, and properly set heap to 512MB for batchtests

git-svn-id: https://svn.codehaus.org/grails/trunk@3982 1cfb16fd-6d17-0410-8ff1-b7e8e1e2867d

Author: marcpalmer

ant/build/unit-test.xml

@@ -97,9 +97,10 @@
 	<target name="run-test" depends="defineTestingScope, build-test">
 		<delete dir="${grails.test.reports}" />
 		<mkdir dir="${grails.test.reports}" />
-		<junit fork="true" forkmode="once">
+		<junit fork="true" maxmemory="512m" forkmode="once">
 			<!-- only fork VMs as needed -->
 			<jvmarg value="-Xmx512M" />
+			<jvmarg value="-XX:MaxPermSize=256m"/>
 			<classpath location="${coverage.build}" />
 			<!-- must be first in cp!    -->
 			<classpath location="cruise/coverage/lib/cobertura.jar" />