Can One Program Run Well on All Species?

• Fortran 77 program: no
  C program: no
  C++ program: no
  <insert serial programming language here> program: no

NERSC MPP Workshop will point out techniques for portability using various parallel programming paradigms

• Message passing
  • Collapse to serial code on one node

  • Portability already demonstrated

• High Performance Fortran (HPF)
  • Collapses to Fortran 90 on one node
    • F90 is the way of the future (certainly for Fortran)

• Special parallel languages (PCP, Sisal, Mentat,....)
  • Collapse to serial code on one node

• High-level methods, like object-oriented
  • Hidden parallel abstraction layers can include serial

• In general: MPP parallelism implies good parallelism on SMP (but not vice-versa)

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