Syntax Example: REAL=150 150/4=37.5 pages. Rounding
to the next page boundary yields 38 pages, or a value of 152K. This
statement allows up to 152K (152 x 1024) bytes to be allocated for
use by V=R jobs.
Note: - If possible, avoid a large value for the REAL parameter because
a large value degrades system performance even when no REAL regions
are allocated.
- The system allocates virtual equals real (V=R)
regions upon request by those programs that cannot tolerate dynamic
relocation. Jobsteps can request to run in a V=R region by using the
ADDRSPC=REAL keyword on the EXEC or JOB statement. If you are sure
you have no requirement for running V=R jobs, then specifying REAL=0
will disallow the use of ADDRSPC=REAL on any JCL.
- In order to eliminate the impact of transition
swaps, set REAL=0 and RSU=0 if you have no requirement for reconfiguring
storage and no need to run a V=R job.