Runtime Support and Compilation Methods for User-Specified Irregular Data Distributions

Ravi Ponnusamy, Joel Saltz, Yuan Shin Hwang, Alok Choudhary

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


This paper describes two new ideas by which a High Performance Fortran compiler can deal with irregular computations effectively. The first mechanism invokes a user specified mapping procedure via a set of proposed compiler directives. The directives allow use of program arrays to describe graph connectivity, spatial location of array elements, and computational load. The second mechanism is a conservative method for compiling irregular loops in which dependence arises only due to reduction operations. This mechanism in many cases enables a compiler to recognize that it is possible to reuse previously computed information from inspectors (e.g., communication schedules, loop iteration partitions, and information that associates off-processor data copies with on-processor buffer locations). This paper also presents performance results for these mechanisms from a Fortran 90D compiler implementation.

Original languageEnglish (US)
Pages (from-to)815-831
Number of pages17
JournalIEEE Transactions on Parallel and Distributed Systems
Issue number8
StatePublished - Aug 1995


  • Runtime support
  • data distributions
  • distributed memory machines
  • high performance Fortran
  • irregular problems
  • language directives
  • parallelizing compilers

ASJC Scopus subject areas

  • Signal Processing
  • Hardware and Architecture
  • Computational Theory and Mathematics


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