Evaluation of a Cray performance tool using a large hydrodynamics code

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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 ... continued below

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Pages: (11 p)

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Lord, K.M. (Cray Research, Inc., Eagan, MN (United States)) & Simmons, M.L. (Los Alamos National Lab., NM (United States)) January 1, 1992.

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Description

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.

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Pages: (11 p)

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OSTI; NTIS; GPO Dep.

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  • 6. international conference on modelling techniques and tools for performance evaluation, Edinburgh (United Kingdom), 16-18 Sep 1992

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  • Other: DE92013239
  • Report No.: LA-UR-92-1453
  • Report No.: CONF-9209109--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5066524
  • Archival Resource Key: ark:/67531/metadc1055818

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1992

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 7:03 p.m.

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Lord, K.M. (Cray Research, Inc., Eagan, MN (United States)) & Simmons, M.L. (Los Alamos National Lab., NM (United States)). Evaluation of a Cray performance tool using a large hydrodynamics code, article, January 1, 1992; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1055818/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.