6. DATA SOURCES › 6.4 CPU Time Measurements › 6.4.4 Variability in CPU Time

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6.4.4 Variability in CPU Time


The amount of CPU time captured for the "same" work can vary
in different environments or at different times in the same
environment, so it is important that you understand how CPU
usage is measured and under what conditions the measures will
vary.  The following subsections discuss some of the
conditions that will interfere with repeatable CPU time
measurements.

    1 - Hardware and Buffer Effects
    2 - I/O Intensity Effects
    3 - DASD Storage Effects
    4 - Explicit Queueing Effects
    5 - Paging Rate Effects
    6 - Miscellaneous Effects