New MaxMetaspaceSize option for trunk (Java 8)

[Matthew Jones]

If you're running java 8 you'll notice 2 new warnings about PermGen. This was changed in java 8 to a new area called Metaspace and there's a lot of side reading if you're interested about this. [1] [2] It seems to be managed a lot better than Permgen was but still should probably be capped if you were setting a MaxPermSize previously

For instance if you had

-XX:MaxPermSize=512m -XX:PermSize=64m

Then use the new Java 8 option:

-XX:MaxMetaspaceSize=512m

Otherwise you'll be using more memory than before and still could run OOM somewhere. We'll update the docs for 11 after some testing.

I had to just restart nightlies as they were missing these options and using twice the memory as before.

[1] http://java.dzone.com/articles/java-8-permgen-metaspace

[2] http://www.infoq.com/articles/Java-PERMGEN-Removed

[Mustansar Mehmood]

I have been using these options for JDK7
JAVA_OPTS="-server  -d64 -XX:+UseParNewGC  -Xmx2048m -XX:MaxPermSize=1024m -Dorg.apache.jasper.compiler.Parser.STRICT_WHITESPACE=false -Dorg.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false -Djava.awt.headless=true -Dcom.sun.management.jmxremote -Dsun.lang.ClassLoader.allowArraySyntax=true -Dsakai.demo=true"

Does anyone know how would these options can be revised to for using JDK8?

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[Matthew Jones]

Change -XX:MaxPermSize=1024m to -XX:MaxMetaspaceSize =1024m

-Dsun.lang.ClassLoader.allowArraySyntax=true is no longer needed since 2.9 (SAK-16745)

-Dorg.apache.jasper.compiler.Parser.STRICT_WHITESPACE is no longer needed since 2.9 (SAK-21265)

-Djava.util.Arrays.useLegacyMergeSort is no longer needed with Java 8 (This was needed in 7 to avoid some errors but not in your string)

I believe  -Dorg.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false is still required.

On the trunk nightly currently we have (It helps for shutdown if you split up the java and catalina opts appropriately)

JAVA_HOME=/usr/lib/jvm/java-8-oracle/

CATALINA_HOME=/var/tomcats/apache-tomcat-8.0.21

CATALINA_BASE=/var/trunk-oracle

CATALINA_PID=/tmp/trunk-oracle.pid

JAVA_OPTS="-Dhttp.agent=Sakai -Dorg.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false -Dsakai.demo=true"

CATALINA_OPTS="-d64 -Xms1512m -Xmx1512m -XX:NewSize=256m -XX:MaxMetaspaceSize=512m -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -Dsakai.cookieName=SAKAIID

 -Dcom.sun.management.jmxremote.port=15555 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Djava.library.path=/var/tomcats/natives/lib/"