Before you have z/OS® V1R6, Java™ SDK 1.4, or a z890 or z990 server, you can do some capacity planning to determine how many zAAPs you need. There is a projection tool (zAAP Projection Tool) available at www.ibm.com/systems/z/hardware/features/zaap/index.html which is a modified Java SDK V1R3, that has some of the same functionality that has been incorporated into Java SDK 1.4 and higher. This tool gathers usage information about how much CPU time is spent executing Java code which could potentially execute on zAAPs. By running a Java workload that is representative of the production system operations, it reports, via the Java log, how much of that workload could be eligible for execution on zAAPs. This information is also useful in predicting the number of zAAPs that might be necessary in order to provide an optimum zAAP configuration.
If you have several systems on the same server on which you are interested in using zAAPs, you can collect the Java log from all the applications running on all the LPARs to have a comprehensive prediction of the total number of zAAPs for a CPC. You may choose to run selected Java workloads, and then extrapolate how much total capacity for zAAPs will be required for all the LPARs where you plan to run Java applications.