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Evaluation of a Cray performance tool using a large hydrodynamics code [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: (11 pages) : digital, PDF file
Additional Creators:
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
This paper will discuss one of these automatic tools that has been developed recently by Cray Research, Inc. for use on its parallel supercomputer. The tool is called ATEXPERT; when used in conjunction with the Cray Fortran compiling system, CF77, it produces a parallelized version of a code based on loop-level parallelism, plus information to enable the programmer to optimize the parallelized code and improve performance. The information obtained through the use of the tool is presented in an easy-to-read graphical format, making the digestion of such a large quantity of data relatively easy and thus, improving programmer productivity. In this paper we address the issues that we found when the took a large Los Alamos hydrodynamics code, PUEBLO, that was highly vectorizable, but not parallelized, and using ATEXPERT proceeded to parallelize it. We show that through the advice of ATEXPERT, bottlenecks in the code can be found, leading to improved performance. We also show the dependence of performance on problem size, and finally, we contrast the speedup predicted by ATEXPERT with that measured on a dedicated eight-processor Y-MP.
Report Numbers:
E 1.99:la-ur-92-1453
E 1.99: conf-9209109--1
conf-9209109--1
la-ur-92-1453
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
01/01/1992.
"la-ur-92-1453"
" conf-9209109--1"
"DE92013239"
6. international conference on modelling techniques and tools for performance evaluation, Edinburgh (United Kingdom), 16-18 Sep 1992.
Simmons, M.L.; Lord, K.M.
Funding Information:
W-7405-ENG-36
View MARC record | catkey: 14355663