Installation of MCNP on 64-bit parallel computers

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The Monte Carlo radiation transport code MCNP has been successfully ported to two 64-bit workstations, the SGI and DEC Alpha. We found the biggest problem for installation on these machines to be Fortran and C mismatches in argument passing. Correction of these mismatches enabled, for the first time, dynamic memory allocation on 64-bit workstations. Although the 64-bit hardware is faster because 8-bytes are processed at a time rather than 4-bytes, we found no speed advantage in true 64-bit coding versus implicit double precision when porting an existing code to the 64-bit workstation architecture. We did find that PVM multiasking is ... continued below

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4 p.

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Meginnis, A.B.; Hendricks, J.S. & McKinney, G.W. September 1, 1995.

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The Monte Carlo radiation transport code MCNP has been successfully ported to two 64-bit workstations, the SGI and DEC Alpha. We found the biggest problem for installation on these machines to be Fortran and C mismatches in argument passing. Correction of these mismatches enabled, for the first time, dynamic memory allocation on 64-bit workstations. Although the 64-bit hardware is faster because 8-bytes are processed at a time rather than 4-bytes, we found no speed advantage in true 64-bit coding versus implicit double precision when porting an existing code to the 64-bit workstation architecture. We did find that PVM multiasking is very successful and represents a significant performance enhancement for scientific workstations.

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4 p.

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INIS; OSTI as DE96000044

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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: DE96000044
  • Report No.: LA-UR--95-3116
  • Report No.: CONF-960415--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 202432
  • Archival Resource Key: ark:/67531/metadc665729

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Office of Scientific & Technical Information Technical Reports

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  • September 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 25, 2016, 7:49 p.m.

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Meginnis, A.B.; Hendricks, J.S. & McKinney, G.W. Installation of MCNP on 64-bit parallel computers, article, September 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc665729/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.