Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Migration Guide

Assessing storage requirements

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:

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:

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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