Rational Developer for System z
COBOL for Windows, Version 7.5, Programming Guide


Choosing compiler features to enhance performance

Your choice of performance-related compiler options and your use of the USE FOR DEBUGGING ON ALL PROCEDURES statement can affect how well your program is optimized.

You might have a customized system that requires certain options for optimum performance. Do these steps:

  1. To see what your system defaults are, get a short listing for any program and review the listed option settings.
  2. Select performance-related options for compiling your programs.

    Important: Confer with your system programmer about how to tune COBOL programs. Doing so will ensure that the options you choose are appropriate for programs at your site.

Another compiler feature to consider is the USE FOR DEBUGGING ON ALL PROCEDURES statement. It can greatly affect the compiler optimizer. The ON ALL PROCEDURES option generates extra code at each transfer to a procedure name. Although very useful for debugging, it can make the program significantly larger and inhibit optimization substantially.

related concepts
Optimization

related tasks
Optimizing your code
Getting listings

related references
Performance-related compiler options


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