Multitasking the three-dimensional transport code TORT on CRAY platforms

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The multitasking options in the three-dimensional neutral particle transport code TORT originally implemented for Cray`s CTSS operating system are revived and extended to run on Cray Y/MP and C90 computers using the UNICOS operating system. These include two coarse-grained domain decompositions; across octants, and across directions within an octant, termed Octant Parallel (OP), and Direction Parallel (DP), respectively. Parallel performance of the DP is significantly enhanced by increasing the task grain size and reducing load imbalance via dynamic scheduling of the discrete angles among the participating tasks. Substantial Wall Clock speedup factors, approaching 4.5 using 8 tasks, have been measured ... continued below

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11 p.

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Azmy, Y. Y.; Barnett, D. A. & Burre, C. A. April 1996.

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The multitasking options in the three-dimensional neutral particle transport code TORT originally implemented for Cray`s CTSS operating system are revived and extended to run on Cray Y/MP and C90 computers using the UNICOS operating system. These include two coarse-grained domain decompositions; across octants, and across directions within an octant, termed Octant Parallel (OP), and Direction Parallel (DP), respectively. Parallel performance of the DP is significantly enhanced by increasing the task grain size and reducing load imbalance via dynamic scheduling of the discrete angles among the participating tasks. Substantial Wall Clock speedup factors, approaching 4.5 using 8 tasks, have been measured in a time-sharing environment, and generally depend on the test problem specifications, number of tasks, and machine loading during execution.

Physical Description

11 p.

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INIS; OSTI as DE96008088

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  • American Nuclear Society (ANS) Radiation Protection and Shielding Division topical meeting on advancements and applications in radiation protection and shielding, Falmouth, MA (United States), 21-25 Apr 1996

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  • Other: DE96008088
  • Report No.: CONF-960415--25
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 219389
  • Archival Resource Key: ark:/67531/metadc668075

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  • April 1996

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 19, 2016, 8:22 p.m.

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Azmy, Y. Y.; Barnett, D. A. & Burre, C. A. Multitasking the three-dimensional transport code TORT on CRAY platforms, article, April 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc668075/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.