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Parallel computation in a three-dimensional elastic-plastic finite-element analysisA CRAY parallel processing technique called autotasking was implemented in a three-dimensional elasto-plastic finite-element code. The technique was evaluated on two CRAY supercomputers, a CRAY 2 and a CRAY Y-MP. Autotasking was implemented in all major portions of the code, except the matrix equations solver. Compiler directives alone were not able to properly multitask the code; user-inserted directives were required to achieve better performance. It was noted that the connect time, rather than wall-clock time, was more appropriate to determine speedup in multiuser environments. For a typical example problem, a speedup of 2.1 (1.8 when the solution time was included) was achieved in a dedicated environment and 1.7 (1.6 with solution time) in a multiuser environment on a four-processor CRAY 2 supercomputer. The speedup on a three-processor CRAY Y-MP was about 2.4 (2.0 with solution time) in a multiuser environment.
Document ID
19920059227
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shivakumar, K. N.
(Analytical Services and Materials, Inc. Hampton, VA, United States)
Bigelow, C. A.
(NASA Langley Research Center Hampton, VA, United States)
Newman, J. C., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Computers & Structures
Volume: 43
Issue: 2 Ap
ISSN: 0045-7949
Subject Category
Computer Programming And Software
Accession Number
92A41851
Funding Number(s)
CONTRACT_GRANT: NAS1-18599
Distribution Limits
Public
Copyright
Other

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