Predicting and limiting ESQA usage

Formulas and examples are provided to help you predict and limit ESQA usage.

To predict the amount of ESQA that is needed to support applications, you need to understand which applications use shmat() and mmap(). You need to approximate the amount of fork() and dbx debugger activity as well. Then, plug your numbers into the equations for each function to determine the amount of needed ESQA.

Tip: In BPXPRMxx, specify the maximum number of shared storage pages that can be used on the MAXSHAREPAGES statement. By limiting the number of shared storage pages, MAXSHAREPAGES enables an installation to control the amount of ESQA storage that is consumed by users. This limit applies to the mmap(), shmat(), ptrace(), and fork() callable services.