Developer Reference

  • 2020 Update 2
  • 07/15/2020
  • Public Content


Provides information on available Intel® MPI Library environment variables.


impi_info <options>


List of options.
-a | -all
Show all IMPI variables.
-h | -help
Show a help message.
-v | -variable
Show all available variables or description of the specified variable.
-c | -category
Show all available categories or variables of the specified category.


utility providesinformation on environment variables available in the Intel MPI Library. For each variable, it prints out the name, the default value, and the value data type. By default, a reduced list of variables is displayed. Use the
option to display all available variables with their descriptions.
The example of the
$ ./impi_info
| NAME | DEFAULT VALUE | DATA TYPE | ======================================================================== | I_MPI_THREAD_SPLIT | 0 | MPI_INT | | I_MPI_THREAD_RUNTIME | none | MPI_CHAR | | I_MPI_THREAD_MAX | -1 | MPI_INT | | I_MPI_THREAD_ID_KEY | thread_id | MPI_CHAR |

Product and Performance Information


Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804