Parallel processing a three-dimensional free-lagrange code
- Los Alamos National Lab., NM (USA)
A three-dimensional, time-dependent free-Lagrange hydrodynamics code has been multitasked and autotasked on a CRAY X-MP/416. The multitasking was done by using the Los Alamos Multitasking Control Library, which is a superset of the CRAY multitasking library. Autotasking is done by using constructs which are only comment cards if the source code is not run through a preprocessor. The three-dimensional algorithm has presented a number of problems that simpler algorithms, such as those for one-dimensional hydrodynamics, did not exhibit. Problems in converting the serial code, originally written for a CRAY-1, to a multitasking code are discussed. Autotasking of a rewritten version of the code is discussed. Timing results for subroutines and hot spots in the serial code are presented and suggestions for additional tools and debugging aids are given. Theoretical speedup results obtained from Amdahl's law and actual speedup results obtained on a dedicated machine are presented. Suggestions for designing large parallel codes are given.
- OSTI ID:
- 5575512
- Journal Information:
- International Journal of Supercomputer Application; (USA), Vol. 3:2; ISSN 0890-2720
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPUTER CODES
DESIGN
PARALLEL PROCESSING
ALGORITHMS
CRAY COMPUTERS
HYDRODYNAMICS
ONE-DIMENSIONAL CALCULATIONS
THREE-DIMENSIONAL CALCULATIONS
TIME DEPENDENCE
COMPUTERS
FLUID MECHANICS
MATHEMATICAL LOGIC
MECHANICS
PROGRAMMING
990210* - Supercomputers- (1987-1989)