See Generic and Specific Application Glossaries
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As nearly all large scale parallel machines are distributed memory, experience is largely
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Fortran, C plus message passing
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CM Fortran
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CM Fortran generalizes to High Performance Fortran (HPF) or HPC++ (remarks independent of language details)
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Explicit Message Passing is only available way on "all" MIMD machines for generating good performance although this is at cost of significant user effort
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user must be given programming models that are portable and scalable - user must "protect investment"
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HPF and Massage Passing both require substantial rewriting of code
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If existing or modestly modified Fortran 77, C, C++ codes would run "well" on parallel machine, then users would be happy
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No evidence yet that this feasible on "large" global address space machines
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Many users want to use workstation clusters as well as dedicated parallel machines
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Mesage Passing allows this
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