SRM calculates a swap recommendation value to determine which address spaces to use in an exchange or unilateral swap. A high swap recommendation value indicates that the address space is more likely to be swapped in. As the swap recommendation value decreases, that address space is more likely to be swapped out.

The swap recommendation value for an address space that is swapped in ranges from 100 to -999 as service is accumulated. An address space must accumulate enough CPU service to justify the cost of a swap out. Once the swap recommendation value goes below 0, the address space is ready to be swapped out in an exchange swap.

The swap recommendation value for an address space that is swapped out and ready to come in ranges from 0 to 998 as the address space remains out. Once the swap recommendation value goes above 100, the address space has been out long enough to justify the cost of the exchange swap.

For an address space that is swapped out but not ready to come in, the swap recommendation value as reported by the RMF™ Monitor II ASD report is meaningless. The swap recommendation value for an address space that is out too long is reported as 999. Also, if an address space has been assigned long-term storage protection (as described in the “Storage Protection” section of the “Workload Management Participants” chapter in z/OS MVS Planning: Workload Management), then the swap recommendation value is 999.

For monitored address spaces, SRM calculates a working set manager recommendation value. See Working set management for information about the working set manager recommendation value.