How to exclude an OFI provider?

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How to exclude an OFI provider?

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Greetings.

In IMPI 2021.14, it was possible to exclude the MLX provider by defining environment variable I_MPI_OFI_PROVIDER='^mlx'. However, in IMPI 2021.16.1 this results in the error:

libfabric:799566:1757052967::core:core:verify_filter_names():653<warn> provider ^mlx is unknown, misspelled or DL provider?

Why? How to exclude MLX in the current version?

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