Storage requirements for Language Environment are larger than for pre-Language Environment PL/I libraries.
DASD storage requirements
During conversion you will need DASD storage for the Language Environment run-time
as well as any pre-Language Environment run-time libraries. When you have finished
moving to Language Environment, you will be able to free the storage reserved for
the previous PL/I run-time libraries.
To determine the amount of DASD storage required by Language Environment, see:
- On z/OS: z/OS Program Directory
- On OS/390: OS/390 Program Directory
Virtual storage requirements
Virtual storage requirements for running PL/I programs with Language Environment will
increase over the OS PL/I run-time. For both CICS and non-CICS applications,
the amount of increase depends on many factors, such as:
- The values used for the Language Environment run-time storage options: STACK, LIBSTACK,
HEAP, ANYHEAP, BELOWHEAP.
- The value used for the Language Environment run-time option ALL31.
- Which run-time routines are in the LPA (link pack area) or the
ELPA (extended link pack area)
Note:
You can use the information generated by the Language Environment RPTSTG(ON)
run-time option to help tune your storage options during the tuning
phase. For details, see the z/OS Language Environment Programming Reference.
Be sure to reset this option to RPTSTG(OFF) before putting the PL/I application
into production, as it will greatly worsen performance.
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