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### Switching the MPI implementation {#sec-overlays-alternatives-mpi}

     

       
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All programs that are built with [MPI](https://en.wikipedia.org/wiki/Message_Passing_Interface) support use the generic attribute `mpi` as an input. At the moment Nixpkgs natively provides two different MPI implementations:

     

       
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All programs that are built with [MPI](https://en.wikipedia.org/wiki/Message_Passing_Interface) support use the generic attribute `mpi` as an input. At the moment Nixpkgs natively provides the following MPI implementations:

     

       
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-   [Open MPI](https://www.open-mpi.org/) (default), attribute name

     

       
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    `openmpi`