Performance evaluation for an asymmetric multiprocessor system

Details Performance evaluation for an asymmetric multiprocessor system Performance evaluation for an asymmetric multiprocessor system

1984-04-16

1987-01-20

Williams, Jr., Archie E.

Boots, shoes, and leggings

G06F 1516, G06F 944

Patent

active

046384278

ABSTRACT:
Accurate and repeatable time accounting is done in an asymmetric multiprocessing system (AMP) by converting the actual execution time of each dispatch of a task on a minor processor in the AMP to an equivalent execution time which would have been obtained if the dispatch had instead been on the major processor in the AMP, so that the overall task time in the AMP is independent of whether the task is dispatched on a minor processor or a major processor in the AMP. Dispatching on an AMP is made more efficient by determining an affinity value (AV) for each task. The AV is the ratio of the task's emulation time on the minor processor to the task's total dispatch time on all processors in the AMP. A low affinity value (near zero) indicates better efficiency for the task by next dispatching it on a minor processor. A high affinity value (near one) indicates better efficiency for the task by next dispatching it on a major processor. The affinity value may be based on all prior dispatches fo the task (i.e. average affinity value), or it may be determined only for the last dispatch (i.e. last affinity value). The accounting time adjustment and the affinity value control over dispatching are separate and independent functions; and either may be provided in an AMP without the other, or both may be provided.

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patent: 4432051 (1984-02-01), Bogaert et al.
patent: 4435759 (1984-03-01), Baum et al.
patent: 4485440 (1984-11-01), Duff et al.
patent: 4590581 (1986-05-01), Widdoes

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