High-performance gravitational N-body simulations on a planet-wide-distributed supercomputer
Groen, Derek; Zwart, Simon Portegies; Ishiyama, Tomoaki; Makino, Jun; Groen, Derek; Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands; Zwart, Simon Portegies; Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands; Ishiyama, Tomoaki; National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan; Makino, Jun; National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
Журнал:
Computational Science & Discovery
Дата:
2011-01-01
Аннотация:
We report on the performance of our cold dark matter cosmological N-body simulation that was carried out concurrently using supercomputers across the globe. We ran simulations on 60–750 cores distributed over a variety of supercomputers in Amsterdam (The Netherlands, Europe), in Tokyo (Japan, Asia), Edinburgh (UK, Europe) and Espoo (Finland, Europe). Regardless of the network latency of 0.32 s and the communication over 30 000 km of optical network cable, we are able to achieve ∼87% of the performance compared to an equal number of cores on a single supercomputer. We argue that using widely distributed supercomputers in order to acquire more compute power is technically feasible and that the largest obstacle is introduced by local scheduling and reservation policies.
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