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Add link to MPICH page from main communication libraries page #242

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5 changes: 3 additions & 2 deletions docs/software/communication/index.md
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CSCS provides common communication libraries optimized for the [Slingshot 11 network on Alps][ref-alps-hsn].

For most scientific applications relying on MPI, [Cray MPICH][ref-communication-cray-mpich] is recommended.
[OpenMPI][ref-communication-openmpi] may also be used, with limitations.
Both Cray MPICH and OpenMPI make use of [libfabric][ref-communication-libfabric] to interact with the underlying network.
[MPICH][ref-communication-mpich] and [OpenMPI][ref-communication-openmpi] may also be used, with limitations.
Cray MPICH, MPICH, and OpenMPI make use of [libfabric][ref-communication-libfabric] to interact with the underlying network.

Most machine learning applications rely on [NCCL][ref-communication-nccl] or [RCCL][ref-communication-rccl] for high-performance implementations of collectives.
NCCL and RCCL have to be configured with a plugin using [libfabric][ref-communication-libfabric] to make full use of the Slingshot network.

See the individual pages for each library for information on how to use and best configure the libraries.

* [Cray MPICH][ref-communication-cray-mpich]
* [MPICH][ref-communication-mpich]
* [OpenMPI][ref-communication-openmpi]
* [NCCL][ref-communication-nccl]
* [RCCL][ref-communication-rccl]
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