Default: CUSHION=100K
CUSHION allows you to guarantee that some virtual storage is left below the 16M line in your region for non-buffering purposes. Dynamic buffering tries to guarantee that at least CUSHION bytes remain in the region after the buffers are allocated for OPEN. Specify as:
CUSHION=value
If any LEVEL selector does not specify the CUSHION constraint, the SYSTEM default CUSHION value is used.
If you do not supply a SYSTEM default CUSHION, 100K is used as the cushion.
See the related constraint DYNAMIC: Controlling Dynamic Region Sizing.
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