Parallel Implementation of the PHOENIX Generalized Stellar Atmosphere Program. III: A parallel algorithm for direct opacity sampling

Details Parallel Implementation of the PHOENIX Generalized Stellar Atmosphere Program. III: A parallel algorithm for direct opacity sampling Parallel Implementation of the PHOENIX Generalized Stellar Atmosphere Program. III: A parallel algorithm for direct opacity sampling

2001-04-16

arxiv.org/abs/astro-ph/0104258v1

Astrophys.J.Suppl. 134 (2001) 323-330

Astronomy and Astrophysics

Astrophysics

19 pages, ApJ Suppl in press (July 2001), 6 figures. Also available at http://phoenix.physast.uga.edu/

Scientific paper

10.1086/320855

We describe two parallel algorithms for line opacity calculations based on a local file and on a global file approach. The performance and scalability of both approaches is discussed for different test cases and very different parallel computing systems. The results show that a global file approach is more efficient on high-performance parallel supercomputers with dedicated parallel I/O subsystem whereas the local file approach is very useful on farms of workstations, e.g., cheap PC clusters.

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