Developer Reference

  • 2020
  • 09/11/2020
  • Public Content

Environment Variables for Multi-EP

Intel® MPI Library Developer Guide for Linux* OS
Note
This feature is supported for the
release_mt
and
debug_mt
library configurations only. To specify the configuration, run the following command:
$ source
<installdir>
/bin/vars.sh release_mt
I_MPI_THREAD_SPLIT
Syntax
I_MPI_THREAD_SPLIT=
<value>
Arguments
<value>
Binary indicator
0 | no | off | disable
Disable the
MPI_THREAD_SPLIT
model support. This is the default value
1 | yes | on | enable
Enable the
MPI_THREAD_SPLIT
model support
Description
Use this environment variable to control the
I_MPI_THREAD_SPLIT
programming model.
I_MPI_THREAD_RUNTIME
Syntax
I_MPI_THREAD_RUNTIME=
<value>
Arguments
<value>
Thread runtime
generic
Enable runtime support (for example, pthreads, TBB). This is the default value if OpenMP* cannot be detected at runtime
openmp
Enable OpenMP* runtime support. This is the default value if OpenMP is detected at runtime.
Description
Use this environment variable to control threading runtime support.
Note
This knob works if
I_MPI_THREAD_SPLIT
model support is enabled.
I_MPI_THREAD_MAX
Syntax
I_MPI_THREAD_MAX=
<int>
Arguments
<int>
The maximum number of threads per rank. The default value is
omp_get_max_threads()
if
I_MPI_THREAD_RUNTIME
is set to
openmp
, 1 otherwise
Description
Use this environment variable to set the maximum number of threads to be used in each process concurrently.
I_MPI_THREAD_ID_KEY
Syntax
I_MPI_THREAD_ID_KEY=
<string>
Arguments
<string>
Define the MPI info object key. The default value is
thread_id
Description
Use this environment variable to set the MPI info object key that is used to explicitly define the logical thread number
thread_id
.
 
 
 
 

Product and Performance Information

1

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Notice revision #20110804