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Evaluating Tuning Success  



Whenever you adjust your system, you should monitor its behavior afterward to be sure that you have obtained the desired results. To observe results, use the Monitor utility and the various forms of the DCL command SHOW. Refer to the HP OpenVMS DCL Dictionary for detailed information about the SHOW command. See Invoking MONITOR for information about using MONITOR. Refer to the HP OpenVMS System Management Utilities Reference Manual for detailed descriptions of MONITOR commands.

For example, you might consider running some programs (whose results you believe are fixed and reproducible) at the same time that you run your normal work load. If you run the programs and measure their running times under nearly identical work load conditions both before and after your adjustments, you can obtain a basis for comparison.

However, when applying this technique, remember to take the measurements under very similar work load conditions. Also, remember that this test alone does not provide conclusive proof of success. The possibility always exists that your adjustments may have favored the performance of the image you are measuring---to the detriment of other images. Therefore, in all cases, continue to observe system behavior closely for a time after you make any changes.


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