Scheduler work area (SWA)

The scheduler work area (SWA) is made up of subpools 236 and 237, which contain information about the job and step itself. Almost anything that appears in the job stream for the step creates some kind of control block here.

Generally, this area can be considered to increase with an increase in the number of DD statements. The distribution of storage in subpools 236 and 237 varies with the operating system release and whether dynamic allocation is used. The total amount of storage in these subpools starts at 100 to 150 KB, and increases by about 1 to 1.5 KB per allocated data set.

A subset of SWA control blocks can, optionally, reside above 16 MB. JES2 and JES3 have parameters that control this. If this needs to be done on an individual job basis, the SMF exit, IEFUJV, can be used.