A Comparative Evaluation of Techniques for Studying Parallel System Performance

This paper presents a comparative and qualitative survey of techniques for evaluating parallel systems. We also survey metrics that have been proposed for capturing and quantifying the details of complex parallel system interactions. Experimentation, theoretical/analytical modeling and simulation are three frequently used techniques in performance evaluation. Experimentation uses real or synthetic workloads, usually called benchmarks, to measure and analyze their performance on actual hardware. Theoretical and analytical models are used to abstract details of a parallel system, providing the view of a simplified system parameterized by a limited number of degrees of freedom that are kept tractable. Simulation and related performance monitoring/visualization tools have become extremely popular becauseof their ability to capture the dynamic nature of the interaction between applications and architectures. We first present the figures of merit that are important for any performance evaluation technique. With respect to these figures of merit, we survey the three techniques and make a qualitative comparison of their pros and cons. In particular, for each of the above techniques we discuss: representative case studies; the underlying models that are used for the workload and the architecture; the feasibility and ease of quantifying standard performance metrics from the available statistics; the accuracy/validity of the output statistics; and the cost/effort that is expended in each evaluation strategy.