Backward Compatibility WG Charter -Monitor MPI3.0 activity to determine each proposals' impact on MPI 2.x users and code base. -The goal is to provide.

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Presentation transcript:

Backward Compatibility WG Charter -Monitor MPI3.0 activity to determine each proposals' impact on MPI 2.x users and code base. -The goal is to provide recommendations to MPI 3.0 proposals and introduce new proposals when appropriate to provide a reasonable transition of MPI 2.x users and the implementations that support those users to MPI 3.0 without hindering the general goals of MPI 3.0.

Backward Compatibility Premises -MPI-2 code should run on MPI-3 implementations without substantial source code changes -substantial == not easily automated -3.0 document must not require indefinite support for multiple versions of the standard. -a transition period may be acceptible

Backward Compatibility Current Idea Use symbol-specific version numbering, with macro (or weak symbol?) mapping the “best” name to most current name, by default. Use a global preprocessor macro to map all versioned symbols to the version provided by a particular version of MPI standard. Use symbol-specific macro to override version mapping for a particular symbol.