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Persistent URL
http://purl.org/net/epubs/work/34600
Record Status
Checked
Record Id
34600
Title
The communication performance of the Cray T3D and its effect on iterative solvers
Contributors
YF Hu (CCLRC Daresbury Lab.)
,
DR Emerson (CCLRC Daresbury Lab.)
,
RJ Blake (CCLRC Daresbury Lab.)
Abstract
On many distributed memory systems, such as workstation clusters or the Intel iPSC/860, the multigrid algorithm suffers from having extensive communication requirements and, in general, it is not very competitive in comparison to the conjugate gradient algorithm. This is in contrast to the sequential problem whereby the multigrid algorithm is very effective in reducing the global residual, particularly for very large linear systems of equations. These two algorithms are now compared on the Gray T3D for solving very large systems of linear equations (resulted from grids of the order 256(3) cells). The communication performance of the Gray T3D is first measured by the standard ping-pong tests and also by practical communication tasks that are found frequently in CFD calculations. It is found that the Gray no has a low latency (approximate to 6 mu s) and a high bandwidth interprocessor communication (120 MB/s) when the low-level intrinsic communication routines are used. As a result, the multigrid algorithm is found to be very competitive when compared with the conjugate gradient algorithm for solving the very large linear systems arising from the Direct Numerical Simulation of turbulent Combustion (DNSC). Results are contrasted by those on the Intel iPSC/860.
Organisation
CCLRC
,
CSE
,
CSE-CEG
Keywords
Funding Information
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Language
English (EN)
Type
Details
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Year
Journal Article
Parallel Comput
22, no. 6 (1996): 829-844.
doi:10.1016/0167-8191(96)00035-X
1996
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