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Increasing the Java Heap size for a Admin Server & managed server in Weblogic

For better performance, we may need to increase the heap size for each Managed Server in our environment.

As per performance tuning guidelines it is good practice to start Admin server with lower JVM heap size than your other managed servers because the Admin server doesn’t required much resources.
By doing this you can utilize the free memory with others where it is needed (This makes sense when you are running Admin and Managed servers on same host)

The size is set in the setDomainEnv.sh file for Linux or setDomainEnv.cmd for Windows, which is in the $DOMAIN_HOME/bin directory.

Steps to set the heap size for Admin and managed server:

1. Shutdown Admin and Managed servers

2. Take backup of setDomainEnv.sh or setDomainEnv.cmd file in case something goes wrong, you can revert the changes. It is best practice to take backup before you made changes in the servers.

3. Open  setDomainEnv file that is under the  $DOMAIN_HOME/bin directory.

4. Copy and paste the below lines in the setDomainEnv file. Make sure you paste the below line at suitable location.

#In case of Admin Server

if [ "${SERVER_NAME}" == "AdminServer" ] ; then
USER_MEM_ARGS="-Xms1024m -Xmx1024m -XX:MaxPermSize=512m"

#In case of osb_server1 Server

if [ "${SERVER_NAME}" == "osb_server1" ] ; then
USER_MEM_ARGS="-Xms512m -Xmx4096m -XX:MaxPermSize=4096m"

 Xms: The initial heapsize
 Xmx: The max heapsize

5. Start the Admin server and Managed server.

6. Verify the changes via weblogic console or in logs.

Some Toughts (4)

  1. added on 10 Dec, 2018

    great post!

  2. added on 12 Dec, 2018

    Muy buena información entregada en esta discusión, muy clara y concisa, me gustó tu blog , muy interesante el tema del cual hay mucho por aprender
    Quiero dejar esta página en la cual puedes ver productos de los retail de todo Chile,
    y comparar los precios de catálogo unimarc con las otras tiendas

  3. added on 23 Jan, 2019

    where is suitable location ? Because I have duplicate parameter Xms, Xmx and I don't know which one is use ?

    weblogic@testhost:~$ pargs 16578
    16578: /weblogic/jdk1.6.0_38/bin/java -server -Xms512m -Xmx1024m -XX:MaxPermSi
    argv[0]: /weblogic/jdk1.6.0_38/bin/java
    argv[1]: -server
    argv[2]: -Xms512m
    argv[3]: -Xmx1024m
    argv[4]: -XX:MaxPermSize=256m
    argv[5]: -Xms1536m
    argv[6]: -Xmx1536m
    argv[7]: -Dweblogic.Name=AdminServer
    argv[8]: -Djava.security.policy=/weblogic/oracle/middleware/wlserver_10.3/server/lib/weblogic.policy
    argv[9]: -Dweblogic.ProductionModeEnabled=true
    argv[10]: -da
    argv[11]: -Dcom.sun.management.jmxremote=true
    argv[12]: -Dcom.sun.management.jmxremote.port=10052
    argv[13]: -Dcom.sun.management.jmxremote.ssl=false
    argv[14]: -Dcom.sun.management.jmxremote.authenticate=false
    argv[15]: -Djavax.management.builder.initial=weblogic.management.jmx.mbeanserver.WLSMBeanServerBuilder
    argv[16]: -Dplatform.home=/weblogic/oracle/middleware/wlserver_10.3
    argv[17]: -Dwls.home=/weblogic/oracle/middleware/wlserver_10.3/server
    argv[18]: -Dweblogic.home=/weblogic/Oracle/Middleware/wlserver_10.3/server
    argv[19]: -Dweblogic.management.discover=true
    argv[20]: -Dwlw.iterativeDev=false
    argv[21]: -Dwlw.testConsole=false
    argv[22]: -Dwlw.logErrorsToConsole=false
    argv[23]: -Dweblogic.ext.dirs=/weblogic/oracle/middleware/patch_wls1036/profiles/default/sysext_manifest_classpath
    argv[24]: -Xms1536m
    argv[25]: -Xmx1536m
    argv[26]: -XX:PermSize=760m
    argv[27]: -XX:MaxPermSize=1024m
    argv[28]: -Djava.security.egd=file:/dev/../dev/urandom
    argv[29]: -Dweblogic.MaxMessageSize=40000000
    argv[30]: weblogic.Server

  4. added on 18 Jul, 2019

    Thanks for sharingcustom erp solutions

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