Specify the reference pattern carefully on REFPAT. If you identify a pattern and do not adhere to it, the system will have to work harder than if you had not issued the macro. Defining the reference pattern can help you define the reference pattern.
The system will not process the REFPAT macro unless the values you specify can result in a performance gain for your program. To make sure the system processes the macro, ask the system to bring in more than three pages (that is, 12288 bytes) on each page fault. Choosing the number of bytes on a page fault can help you meet that requirement.