Performance comparison



Having arrived at a pre-initialisation solution which gives REXX the ability to process VSAM Clusters, it seemed prudent to compare the solution with a non-pre-initialised alternative.

Performance comparison for Phase 4



Run No.

Pre-Initialised

No Pre-initialisation

1

0.292210

4.095934

2

0.247461

4.531359

3

0.336055

3.434942

4

0.305891

4.288022

5

0.289803

4.535483

6

0.389036

3.126893

7

0.341283

4.039181

8

0.467578

3.792543

9

0.376700

3.590579

10

0.443053

4.064999

Average

0.348907

3.949994



It should be noted that the performance data above was not collected in a dedicated system so is subject to the impact of otherwork but that said it can be seen pre-initialisation has a considerable benefit in terms of performance which would be realised to greater effect with even more iterations.

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