Define the name of the OFI provider to load.

Set this environment variable to define the name of the OFI provider to load. If you do not specify this variable, the OFI library chooses the provider automatically. You can check all available providers by using the

I_MPI_OFI_PROVIDER_DUMP

environment variable. If you set the wrong name for an available provider, use

FI_LOG_LEVEL=debug

 to get a hint to set the name  correctly.

Control the capability of printing information about all OFI providers and their attributes from an OFI library.

Set this environment variable to control the capability of printing information about all OFI providers and their attributes from an OFI library.

Control the capability of the direct receive in the OFI fabric.

Use the direct receive capability to block

MPI_Recv

calls only. Before using the direct receive capability, ensure that you use it for single-threaded MPI applications and check if you have selected OFI as the network fabric by setting

I_MPI_FABRICS=ofi

.

Control the usage of libfabric* shipped with the Intel® MPI Library.

Set this environment variable to disable or enable usage of libfabric from the Intel MPI Library. The variable must be set before sourcing the

vars.[c]sh

script.

Setting this variable is equivalent to passing the

-ofi_internal

option to the

vars.[c]sh

script.

For more information, refer to the Intel® MPI Library Developer Guide, section

Running Applications > Libfabric* Support.