Performance effects of node mappings on the IBM BlueGene/L machine

Brian E. Smith, Brett Bode

Research output: Contribution to journalConference articlepeer-review


The IBM BlueGene/L supercomputer consists of up to 65536 compute nodes connected by several networks including a three-dimensional torus. The BlueGene/L control system allows a user to re-map MPI ranks to different physical torus coordinates at run-time. Effects of node mapping on application performance are investigated for Gray-code mappings with differing aspect ratios, permutations of the X, Y, and Z coordinates, random mappings and four new mapping types. Results are presented for three NAS parallel benchmarks - BT, CG, and MG - on 128-way partitions in co-processor mode and virtual node mode on the prototype BlueGene/L hardware.

Original languageEnglish (US)
Pages (from-to)1005-1013
Number of pages9
JournalLecture Notes in Computer Science
StatePublished - 2005
Externally publishedYes
Event11th International Euro-Par Conference, Euro-Par 2005 - Lisbon, Portugal
Duration: Aug 30 2005Sep 2 2005

ASJC Scopus subject areas

  • Theoretical Computer Science
  • General Computer Science


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