Specifications

Chapter 3. z/OS notes 27
Using the shell, you can run the following command before launching your application:
$ export IBM_JAVA_OPTIONS="-Xquickstart"
Or you can add this option to the default shell profile on a system-wide basis by adding the
following line to /etc/profile:
export IBM_JAVA_OPTIONS="-Xquickstart"
While this is a good setting to set system-wide, we suggest that you use this mechanism in
addition to customizing the startup script or JVM command line for your application. Certain
Java startup jobs may not inherit the bash profile environment variables while others may
override the value being specified in the IBM_JAVA_OPTIONS.
wsadmin tool
The wsadmin tool is used the configure and administer application servers, application
deployment, and server run-time operations. The details of usage may change among various
WebSphere releases. The following suggestion is based on an older WebSphere release
(6.1) but may be adapted to later releases.
To improve wsadmin performance on zPDT, edit the wsadmin.sh script located in the
/usr/lpp/zWebSphere/V6R1M0/bin directory by adding the -Xquickstart option for the z/OS
platform. (If you use the jython script described later you do not need to make the individual
option and configuration changes noted here.)
case $PLATFORM in
AIX)
PERF_JVM_OPTIONS="-Xms256m -Xmx256m -Xquickstart" ;;
Linux)
PERF_JVM_OPTIONS="-Xms256m -Xmx256m -Xj9 -Xquickstart" ;;
SunOS)
PERF_JVM_OPTIONS="-Xms256m -Xmx256m -XX:PermSize=40m" ;;
HP-UX)
PERF_JVM_OPTIONS="-Xms256m -Xmx256m -XX:PermSize=40m" ;;
OS/390)
PERF_JVM_OPTIONS="-Xms256m -Xmx256m -Xquickstart" ;;
esac
WebSphere address spaces
The WebSphere Application Server runs in multiple address spaces with a separate JVM in
each address space. There is one control region, zero or one adjunct region, and at least one
servant region. For an earlier release (6.1) the Java properties of these address spaces can
be tweaked by editing files control.jvm.options, adjunct.jvm.options and servant.jvm.options in
the /u/WebSphere/V6R1/ADCD.ADCD.BBOS001 and adding the "-Xquickstart" option:
...
-Dosgi.configuration.area=/u/WebSphere/V6R1/AppServer/profiles/default/configur
ation
-Xquickstart
-Dserver.root=/u/WebSphere/V6R1/AppServer/profiles/default
...
Note that if the admin console is used to modify and save the configuration, the changes to
the properties files will be overwritten.