Performance Comparison

This chart illustrates the difference in performance between pre-initialisation, on the right, and the lack of it on the left.

The Phase 1 job output listed 10 SYSOUT files, with the displayed counter having the same value on each.

The Phase 2 job output had a single SYSOUT file, with the displayed count being incremented from 1 to 10.

LINKPGM was executed 10 times in each of the runs shown opposite.

Performance comparison between Phase 1 and 2.

Run No.	Phase 1	Phase 2
1	2.801070	0.382211
2	1.511351	0.208990
3	1.332699	0.188602
4	1.405288	0.191475
5	1.282919	0.221479
6	1.460920	0.244102
7	1.320728	0.478511
8	1.311743	0.259229
9	1.355628	0.176460
10	1.565323	0.749645
Average	1.5347669	0.3100704

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.