Tuning Environment Variables
I_MPI_TUNING_MODE
Select the tuning method.
Syntax
I_MPI_TUNING_MODE=<arg>
A
rgument<arg> | Description |
none |
Disable tuning modes. This is the default value.
|
auto |
Enable autotuner.
|
auto:application |
Enable autotuner with application focused strategy (alias for auto).
|
auto:cluster |
Enable autotuner without application specific logic. This is typically performed with the help of benchmarks (for example, IMB-MPI1) and proxy applications.
|
Description
Set this environment variable to enable the autotuner functionality and set the autotuner strategy.
I_MPI_TUNING_BIN
Specify the path to tuning settings in a binary format.
Syntax
I_MPI_TUNING_BIN=<path>
Argument
/p>
<path> |
A path to a binary file with tuning settings. By default, Intel® MPI Library uses the binary tuning file located at < $I_MPI_ROOT/etc> .
|
Description
Set this environment variable to load tuning settings in a binary format.
I_MPI_TUNING_BIN_DUMP
Specify the file for storing tuning settings in a binary format.
Syntax
I_MPI_TUNING_BIN_DUMP=<filename>
Argument
/p>
<filename> |
A file name of a binary that stores tuning settings. By default, the path is not specified.
|
Description
Set this environment variable to store tuning settings in a binary format.
I_MPI_TUNING
Load tuning settings in a JSON format.
Syntax
I_MPI_TUNING=<path>
Argument
/p>
<path> |
A path to a JSON file with tuning settings.
|
Description
Set this environment variable to load tuning settings in a JSON format.
The tuning settings in the JSON format are produced by the mpitune utility.
By default, Intel® MPI library loads tuning settings in a binary format. If it is not possible, Intel MPI Library loads the tuning file in a JSON format specified through the
I_MPI_TUNING
environment variable.Thus, to enable JSON tuning, turn off the default binary tuning:
I_MPI_BIN=""
. If it is not possible to load tuning settings from a JSON file and in a binary format, the default tuning values are used.You do not need to turn off binary or JSON tuning settings if you use
I_MPI_ADJUST
family environment variables. The algorithms specified with I_MPI_ADJUST
environment variables always have priority over binary and JSON tuning settings.