The MLX provider was added in the 2019 Update 5 release as a binary in internal libfabric distribution. Every provider has a description and parameters relevant to the Intel MPI Library, and optional notes in the form of prerequisites or limitations. This section describes OFI providers supported by the Intel MPI Library. Linux* OS OFI Providers Supported by Intel MPI Library Debug output is only available if the library has been compiled with debugging enabled. Debug: Debug is high traffic and is likely to impact application performance.Info: Info is high traffic and meant for detailed output.Trace: Trace is more verbose and is meant to include non-detailed output helpful for tracing program execution.Warn: Warn is the least verbose setting and is intended for reporting errors or warnings.Logging InterfaceįI_LOG_LEVEL= controls the amount of logging data that is output. The provider uses this to optimize resource allocations. The environment variable FI_UNIVERSE_SIZE= for RxM, MLX, and EFA providers defines the maximum number of processes used by a distributed OFI application. Note: The I_MPI_OFI_PROVIDER is preferred over the FI_PROVIDER. You can specify the selected OFI provider with the IMPI environment variable: export I_MPI_OFI_PROVIDER= To select the OFI provider from the libfabric library, use the FI_PROVIDER environment variable, which defines the name of the OFI provider to load:

Note: You can use I_MPI_DEBUG=4 to display the libfabric version. MPI startup(): libfabric provider: verbs ofi_rxm MPI startup(): libfabric version: 1.10.0a1 MPI startup(): libfabric provider: mlx source. MPI startup(): libfabric version: 1.9.0a1-impi I_MPI_DEBUG=4 mpirun -n 1 IMB-MPI1 barrier To disable this, use the I_MPI_OFI_LIBRARY_INTERNAL environment variable or -ofi_internal (by default ofi_internal=1): source. Using the Intel MPI Library Distribution of Libfabricīy default, mpivars.sh/csh/bat (or vars.sh/bat for oneAPI) for Linux* or Windows* sets the environment to the version of libfabric shipped with the Intel MPI Library. See the OFI web site for more details, including a project overview and detailed API documentation. It hides most transport and hardware implementation details from middleware and applications to provide high-performance portability between diverse fabrics. Libfabric is a low-level communication abstraction for high-performance networks. The following diagram shows the Intel MPI Library software stack: The Intel MPI Library package contains the libfabric library, which is used when the mpivars.sh/csh/bat script executes. The DAPL, TMI, and OFA fabrics are deprecated. With the 2019 release, the Intel® MPI Library switched from the Open Fabrics Alliance* (OFA) framework to the Open Fabrics Interfaces* (OFI) framework and currently supports libfabric*.

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