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mention package extension for MPI #1122

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Oct 5, 2023
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mention package extension for MPI #1122

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3 changes: 2 additions & 1 deletion docs/src/mpi.md
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Expand Up @@ -11,9 +11,10 @@ They are also available via the package manager of a number of Linux
distributions.

Finally, note that the MPI.jl package is lazy-loaded by HDF5.jl
using [Requires](https://github.com/JuliaPackaging/Requires.jl).
using [Requires](https://github.com/JuliaPackaging/Requires.jl) up to Julia v1.8.
In practice, this means that in Julia code, `MPI` must be imported _before_
`HDF5` for parallel functionality to be available.
In Julia v1.9 and newer, a package extension is used to reduce the latency.

## Setting-up Parallel HDF5

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