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Keywords: performance perturbation, performance measurement
When performance measurements are made of program operation actual execution behavior can be perturbed. In general, the degree of perturbation depends on the intrusiveness and frequency of the instrument ation. If the perturbation effects of the instrumentation cannot be quantified by a perturbation model (and subsequently removed during perturbation analysis), detailed performance measurements could be inaccurate. Developing models of time and event perturbations that can recover actual execution performance from perturbed performance measurements is the topic of this paper. Time-based models can accurately capture execution time perturbations for sequential computations and concurrent computations with simple fork-join behavior. However, the performance of parallel computations generally depends on the relative ordering of dependent events and the assignment of computational resources. Event-based models must be used to quantify instrumentation perturbation in parallel performance measurements. The measurement and subsequent analysis of synchronization operations (e.g., barrier, semaphore, and advance/await synchronization) can produce accurate approximations to actual performance behavior. Unfortunately, event-based models are limited in their ability to fully capture perturbation effects in nondeterministic executions.
Created: Wed Feb 18 11:37:16 US/Pacific 2004
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