Latency reduction from runtime-interference to the parallel Quantum Chemistry program GREMLIN in heterogeneous and homogeneous environments

Authors:
Siegfried Höfinger
Affiliations:
Department of Theoretical Chemistry and Molecular Structural Biology, Molecular Dynamics and Biomolecular Simulation Group, University of Vienna, Währingerstr. 17, A-1090 Vienna, Austria
Venue:
Future Generation Computer Systems - Tools for program development and analysis
Year:
2003

Citing 3
Cited 0

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Abstract

The runtime behaviour of the PVM version of the Quantum Chemistry program GREMLIN is monitored and analyzed with respect to the latency of the different participating hosts. A priori parallel performance is far from optimal, because of the multifold variabilities influencing the heterogeneous cluster environment. The article discusses the improvement gained when periodically re-partitioning the load based on the current actual latencies of the parallel nodes. It is also shown that even on homogeneous parallel architectures this dynamic version of Speed Weighted Load Balancing (SWLB) may aid to optimize parallel performance considerably.