JVM Heap Tuning for OID Managed Server/WebLogic Server

JVM Heap Tuning for OID Managed Server/WebLogic Server

This is applicable for any weblogic Admin and Managed Server.
In $DOMAIN_HOME/servers/wls_ods1/logs/wls_ods1.log you would notice an error like this and OID managed server would go to UNKNOW status.

####<Jul 26, 2013 5:57:00 AM BST> <Error> <Kernel> <mkktestserver1.unixdomain.local> <wls_ods1> <[STUCK] ExecuteThread: '5' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <39cb4812cad10e7e:-5dbeb3ba:14006f69c2f:-8000-0000000000005522> <1374814620626> <BEA-000802> <ExecuteRequest failed
java.lang.OutOfMemoryError: Java heap space.
java.lang.OutOfMemoryError: Java heap space
>

Solution

From nodemanager.properties I can observe that we are using start up scripts to bring up OID servers. From start up script I can see we are using a maximum of 1024M of heap which might not be sufficient.

JVM Heap is configured in the following file:
$DOMAIN_HOME/bin/setDomainEnv.sh

Go to the following line:
EXTRA_JAVA_PROPERTIES="${EXTRA_JAVA_PROPERTIES} -Didm.oracle.home=${IDM_ORACLE_HOME} -Xms512m -Xmx1024m -Xss512K -Djava.protocol.handler.pkgs=oracle.mds.net.protocol -Dweblogic.management.discover=false"
export EXTRA_JAVA_PROPERTIES

Since we are using a 64 bit JDK, it is well worth to try update memory settings to:
EXTRA_JAVA_PROPERTIES="${EXTRA_JAVA_PROPERTIES} -Didm.oracle.home=${IDM_ORACLE_HOME} -Xms2048m -Xmx2048m -Xss512K -Djava.protocol.handler.pkgs=oracle.mds.net.protocol -Dweblogic.management.discover=false"
export EXTRA_JAVA_PROPERTIES

Keep monitoring wls_ods1.log for Java Heap Space Issue.

applive IDMLIVE /opt/oracle/IDMLIVE_MW_HOME/WebLogic/user_projects/domains/IDMDomain/bin $ diff setDomainEnv.sh.43 setDomainEnv.sh
372c372
< EXTRA_JAVA_PROPERTIES="${EXTRA_JAVA_PROPERTIES} -Didm.oracle.home=${IDM_ORACLE_HOME} -Xms512m -Xmx1024m -Xss512K -Djava.protocol.handler.pkgs=oracle.mds.net.protocol -Dweblogic.management.discover=false"
---
> EXTRA_JAVA_PROPERTIES="${EXTRA_JAVA_PROPERTIES} -Didm.oracle.home=${IDM_ORACLE_HOME} -Xms2048m -Xmx2048m -Xss512K -Djava.protocol.handler.pkgs=oracle.mds.net.protocol -Dweblogic.management.discover=false"
applive IDMLIVE /opt/oracle/IDMLIVE_MW_HOME/WebLogic/user_projects/domains/IDMDomain/bin $