Developer Reference

OFI*-capable Network Fabrics Control

I_MPI_OFI_PROVIDER

Define the name of the OFI provider to load.
Syntax
I_MPI_OFI_PROVIDER=
<name>
Arguments
<name>
The name of the OFI provider to load
Description
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.

I_MPI_OFI_PROVIDER_DUMP

Control the capability of printing information about all OFI providers and their attributes from an OFI library.
Syntax
I_MPI_OFI_PROVIDER_DUMP=
<arg>
Arguments
<arg>
Binary indicator
enable | yes | on | 1
Print the list of all OFI providers and their attributes from an OFI library
disable | no | off | 0
No action. This is the default value
Description
Set this environment variable to control the capability of printing information about all OFI providers and their attributes from an OFI library.

I_MPI_OFI_DRECV

Control the capability of the direct receive in the OFI fabric.
Syntax
I_MPI_OFI_DRECV=
<arg>
Arguments
<arg>
Binary indicator
enable | yes | on | 1
Enable direct receive. This is the default value
disable | no | off | 0
Disable direct receive
Description
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
.

I_MPI_OFI_LIBRARY_INTERNAL

Control the usage of libfabric* shipped with the Intel® MPI Library.
Syntax
I_MPI_OFI_LIBRARY_INTERNAL=
<arg>
Arguments
<arg>
Binary indicator
enable | yes | on | 1
Use libfabric from the Intel MPI Library
disable | no | off | 0
Do not use libfabric from the Intel MPI Library
Description
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.

Example

$ export I_MPI_OFI_LIBRARY_INTERNAL=1 $ source <installdir> /bin/vars.sh
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 Libfabric* Support.

Product and Performance Information

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Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.