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ParGrad System: Dynamical Adaptation of the Parallelism Degree of Programs on Cray T3E

In: High Performance Computing in Science and Engineering ’99

Author

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  • Otilia Werner-Kytölä

    (Karlsruhe University, Department of Computer Science)

Abstract

Typically, parallel programs are scheduled to use all available processors. However, communication costs can overwhelm the gain through parallelism, causing the program to run slower than with a smaller number of processors. Moreover, allocating many processors to a parallel program may produce poor machine utilization. We show that a parallel program can adapt its parallelism degree automatically to achieve an optimum with respect to criteria such as minimal execution time, achievement of a efficiency threshold or minimal cost-benefit ratio. The adjustment is based on execution time measurements. It only requires programmers to identify the loop, whose parallelism degree is to be adapted, and to set some parameters for the adaptation. The technique has been implemented and tested on the Cray T3E with real applications in the fields of Mathematics, Electrical Engineering and Geophysics. The results concerning four of these applications are presented here. Besides of the extra time needed for the adaptation, the optima were found in all analyzed cases.

Suggested Citation

  • Otilia Werner-Kytölä, 2000. "ParGrad System: Dynamical Adaptation of the Parallelism Degree of Programs on Cray T3E," Springer Books, in: Egon Krause & Willi Jäger (ed.), High Performance Computing in Science and Engineering ’99, pages 457-468, Springer.
    • Handle: RePEc:spr:sprchp:978-3-642-59686-5_44
    DOI: 10.1007/978-3-642-59686-5_44
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