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JOURNAL OF PARALLEL AND DISTRIBUTED COMPUTING 2000年第12期60卷 1512-1530页

作者： Hu, YC Lu, HH Cox, AL Zwaenepoel, W Rice Univ Dept Comp Sci Houston TX 77005 USA Rice Univ Dept Elect & Comp Engn Houston TX 77005 USA

In this paper, we present the first system that implements openmp on a network of shared-memory multiprocessors. This system enables the programmer to rely on a single, standard, shared-memory API for parallelization within a multiprocessor and between multiprocessors. It is implemented via a translator that converts openmp directives to appropriate calls to a modified version of the TreadMarks software distributed shared-memory (SDSM) system. In contrast to previous SDSM systems for SMPs, the modified TreadMarks system uses POSIX threads for parallelism within an SMP node. This approach greatly simplifies the changes required to the SDSM in order to exploit the intranode hardware shared memory. We present performance results for seven applications (Barnes-Hut, CLU, and Water from SPLASH-2, 3D-FFT from NAS, Red-Black SOR, TSP, and MGS) running on an SP2 with four four-processor SMP nodes. A comparison between the thread implementation and the original implementation of TreadMarks shows that using the hardware shared memory within an SMP node significantly reduces the amount of data and the number of messages transmitted between nodes and consequently achieves speedups that are up to 30% better than the original versions. We also compare SDSM against message passing. Overall, the speedups or multithreaded TreadMarks programs are within 7-30% of the MPI versions. (C) 2000 Academic Press.

关键词： openmp shared memory programming POSIX threads networks of SMPs software distributed shared memory

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