2.A User Interface Model

• Not a new language

• Compiler directives, library and environment variables extend base language

  • Base languages extended: f77, f90, C, C++

• NOT Automatic parallelization

  • User explicitly specifies parallel execution
  • Compiler does not ignore user directives even if wrong

• Only practical constructs that can be implemented with high performance in commercial compilers

  • Goal of parallel programming: application speedup

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