Basic HTML version of Foils prepared 2 September 1997

Foil 10 Approaches to Parallel Programming

From CPS615 Laplace Example -- Programming Models and Performance CPS615 Basic Simulation Track for Computational Science -- Fall Semester 97. by Geoffrey C. Fox


Data Parallel typified by CMFortran and its generalization - High Performance Fortran which we have discussed separately
Typical Data Parallel Fortran Statements are full array statements
  • B=A1 + A2
  • B=EOSHIFT(A,-1)
  • Function operations on arrays representing full data domain
Message Passing typified by later discussion of Laplace Example which specifies specific machine actions i.e. send a message between nodes whereas data parallel model is at higher level as it (tries) to specify a problem feature
Note: We are always using "data parallelism" at problem level whether software is "message passing" or "data parallel"
Data parallel software is translated by a compiler into "machine language" which is typically message passing



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