Calculating Region Size

Include the following items in your calculation of the amount of virtual storage needed by the CMEM monitor:

• block size of the IOA Conditions file (fixed at 32,760)

  The storage chunks allocated for this requirement are above the 16 MB line.

• CMEM monitor working buffers require approximately 6500 K of virtual storage. The storage chunks allocated for this requirement are mostly above the 16 MB line.
• CMEM monitor software requires approximately 2000 K of virtual storage, depending on the environment and the functions used. The storage chunks allocated for this requirement are both above and below the 16 MB line.
• site‑defined work areas and programs (for example, user exits)

  These items usually require a small amount of virtual storage. Therefore, it is usually not necessary to calculate the requirements of site‑defined components precisely. However, it is important that you allow some extra storage space for these components. The storage chunks allocated for this requirement are both above and below the 16 MB line.

You should specify a larger than necessary region size to ensure sufficient storage space for CMEM and related MVS activities.

A site has the following:

• IOA Conditions file block size of 32760
• 32 slots per block (CNDREC#)
• site-defined components requiring approximately 0.20 MB of virtual storage

Calculate virtual storage for the CMEM monitor as follows:

Table 107 CMEM Monitor Virtual Storage (Below the 16 MB Line)

Table 108 CMEM Monitor Virtual Storage (Above the 16 MB Line)