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

Choosing options for improved performance

ARCH
BIFPREC(31)
DEFAULT(NONASGN)
DEFAULT(CONNECTED)
DEFAULT(REORDER)
DEFAULT(NOOVERLAP)
OPTIMIZE(2)/OPTIMIZE(3)
REDUCE
NORENT
RULES(NOLAXCTL)
TUNE

This section describes some of the options that you can choose to improve the performance of the compiler generated code.

If you want to ignore all the discussion below and blindly try to improve performance at all costs, you should:

  1. use the following default options:
  2. specify the following additional, non-default options:

However, while there are considerations (discussed below) that may make you choose not to use all of the above options, unless you use both DFT(REORDER) and at least OPT(2), you will not get good performance from the generated code.


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