Paper Info
Title
Scalability of hybrid programming for a CFD code on the earth simulator
Abstract
The Earth Simulator (ES) is an SMP cluster system. There are two types of parallel programming models available on the ES. One is a flat programming model, in which a parallel program is implemented by MPI interfaces only, both within an SMP node and among nodes. The other is a hybrid programming model, in which a parallel program is written by using thread programming within an SMP node and MPI programming among nodes simultaneously. It is generally known that it is difficult to obtain the same high level of performance using the hybrid programming model as can be achieved with the flat programming model.In this paper, we have evaluated scalability of the code for direct numerical simulation of the Navier-Stokes equations on the ES. The hybrid programming model achieves the sustained performance of 346.9 Gflop/s, while the flat programming model achieves 296.4 Gflop/s with 16 PNs of the ES for a DNS problem size of 2563. For small scale problems, however, the hybrid programming model is not as efficient because of microtasking overhead. It is shown that there is an advantage for the hybrid programming model on the ES for the larger size problems.
Year
DOI
Venue
2004
10.1016/j.parco.2004.09.006
Parallel Computing
Keywords
Field
DocType
parallel programming model,scalability,direct numerical simulation,programming model
Direct numerical simulation,Programming paradigm,Simulation,Computer science,Parallel computing,Thread (computing),Computational science,Parallel programming model,Reactive programming,Computational fluid dynamics,Hybrid programming,Scalability
Journal
Volume
Issue
ISSN
30
12
0167-8191
Citations 
PageRank 
References 
4
0.68
9
Authors
5
Name
Order
Citations
PageRank
Ken'ichi Itakura16512.11
Atsuya Uno240.68
Mitsuo Yokokawa322751.71
Takashi Ishihara4367.59
Yukio Kaneda57417.65