Shared Memory Programming in Metacomputing Environments: The Global Array Approach
- Cite this article as:
- Nieplocha, J. & Harrison, R. The Journal of Supercomputing (1997) 11: 119. doi:10.1023/A:1007955822788
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The performance of the Global Array shared-memory nonuniform memory-access programming model is explored in a wide-area-network (WAN) distributed supercomputer environment. The Global Array model is extended by introducing a concept of mirrored arrays that thanks to the caching and user-controlled consistency of the shared data structure scan reduce the application sensitivity to the network latency. Latencies and bandwidths for remote memory access are studied, and the performance of a large application from computational chemistry is evaluated using both fully distributed and also mirrored arrays. Excellent performance can be obtained with mirroring if even modest (0.5 MB/s) network bandwidth is available.