Vector processing on the Alliant FX/8 multiprocessor
Technical Report
·
OSTI ID:7162994
The Alliant FX/8 multiprocessor implements several high-speed computation ideas in software and hardware. Each of the 8 computational elements (CEs) has vector capabilities and multiprocessor support. Generally, the FX/8 delivers its highest processing rates when executing vector loops concurrently. In this paper, extensive empirical performance results are presented for vector processing on the FX/8. The vector kernels of the LANL BMK8al benchmark are used in the experiments. Each kernel is executed on 1 and 8 CEs and show the measured execution rate (in MFLOPS) as a function of vector length. The performance of 1 CE as a vector processor is analyzed by finding the vector lengths where vector processing exceeds that of scalar processing and calculating Hockney's n/sub 1/2/. For 8 CEs, upper/lower bounds are given on the achieved speedups and on the multiprocessing overhead. The speedup variation is shown as the number of CEs increases from 2 to 8. 25 refs., 8 figs., 7 tabs.
- Research Organization:
- Illinois Univ., Urbana (USA). Center for Supercomputing Research and Development
- DOE Contract Number:
- FG02-85ER25001
- OSTI ID:
- 7162994
- Report Number(s):
- DOE/ER/25001-18; ON: DE87002098
- Country of Publication:
- United States
- Language:
- English
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