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.

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 mpivars.[c]sh script.

Example

$ export I_MPI_OFI_LIBRARY_INTERNAL=1
$ source <installdir>/intel64/bin/mpivars.sh

Setting this variable is equivalent to passing the -ofi_internal option to the mpivars.[c]sh script.

For more information, refer to the Intel® MPI Library Developer Guide, section Running Applications > Libfabric* Support.

For more complete information about compiler optimizations, see our Optimization Notice.
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