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

Tuning for better CPU and storage utilization

Improving CPU Utilization
Improving Storage Utilization
Improving Performance under Subsystems

After you migrate to Language Environment, you should retune your applications to maximize the performance. When you retune an application, it is not always possible to maximize CPU and storage at the same time. Often you will find that, in order to obtain better CPU, you need to use more storage, or vice versa. This section provides general tips to help you to retune your applications under Language Environment.

For information on choosing compiler options for improved performance see Choosing options for improved performance.

For more information on tools you can use to improve performance for your applications, see z/OS Language Environment Programming Guide, z/OS Language Environment Installation and Customization under OS/390 or z/OS Language Environment Customization, and Enterprise PL/I for z/OS Programming Guide.


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