 | Performance improvements when using compiled REXX code versus interpreted REXX code on zSeries The performance improvements that you can expect when you run compiled REXX programs depend on the type of program. A program that performs many arithmetic operations of default precision shows the greatest improvement. A program that mainly issuses commands to the operating system shows minimal improvement because REXX can not decrease the time taken by the operating system to process the commands. Performance comparisons| Compiled programs that include many ... | Can run this much faster |
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| Arithmetic operations | Up to 6 to 10 times | | String and word processing | Up to 6 to 10 times | | Constants and variables | Up to 4 to 6 times | | References to procedures and built-in functions | Up to 4 to 6 times | | Changes to values of variables | Up to 4 to 6 times | | Assignments | Up to 2 to 4 times | | Reused compound variables | Up to 2 to 4 times | | Operating system commands | Minimal improvement | | Imbedded SQL | Minimal improvement | |
