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# mpiCheckPhaseHook {#setup-hook-mpi-check}
This hook can be used to setup a check phase that
requires running a MPI application. It detects the
used present MPI implementation type and exports
the neceesary environment variables to use
`mpirun` and `mpiexec` in a Nix sandbox.
Example:
```nix
{ mpiCheckPhaseHook, mpi, ... }:
{
# ...
nativeCheckInputs = [
openssh
mpiCheckPhaseHook
];
}
```
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