plucky (3) MPI_Info_env.openmpi.3.gz

Provided by: openmpi-doc_5.0.7-1_all bug

DESCRIPTION
       The  MPI-3  standard  established  a static MPI_Info object named MPI_Info_env that can be used to access
       information about how the application was executed from the run-time.


SUPPORTED FIELDS
       command
              If available, the value will be set to argv[0]. Note that the value may not always be available  -
              e.g.,  it is valid for a program to call MPI_Init with NULL parameters, in which case argv[0] will
              not be set if run as a singleton. This value will never be set in a Fortran program  as  the  argv
              are not available.

       argv   The argv given for the application. If no arguments are passed to the application, then this value
              will not be set. It will also not be set in the case of a singleton that calls MPI_Init with  NULL
              parameters, or a Fortran program.

       maxprocs
              The number of processes in the job.

       soft   Open  MPI  does not support the soft option for specifying the number of processes to be executed,
              so this value is set to the same as maxprocs.

       host   The name of the host this process is executing upon - the value returned from gethostname().

       arch   The architecture of the host this process is executing upon. This value indicates  the  underlying
              chip architecture (e.g., x86_64), if it can be determined.

       wdir   The  working  directory at the time of process launch by mpiexec. Note that this value will not be
              set for processes launched as singletons as there is no  reliable  way  for  the  MPI  library  to
              determine the location.

       file   Although specified by the MPI-3 standard, no value is currently set for this field.

       thread_level
              The requested MPI thread level - note that this may differ from the actual MPI thread level of the
              application.

       ompi_num_apps
              The number of application contexts in an MPMD job. This is an Open MPI-specific field and value.

       ompi_np
              The number of processes in each  application  context,  provided  as  a  space-delimited  list  of
              integers. This is an Open MPI-specific field and value.

       ompi_first_rank
              The  MPI rank of the first process in each application context, provided as a space-delimited list
              of integers This is an Open MPI-specific field and value.

       ompi_positioned_file_dir
              If Open MPI was asked to pre-position files, this field provides  the  top-level  directory  where
              those files were place. This is an Open MPI-specific field and value.


ERRORS
       When calling MPI_Info_get, the flag parameter will be set to zero
       (false) if a value for the field has not been set.

       SEE ALSO:

          • MPI_Info_get


       2003-2025, The Open MPI Community

                                                  Feb 17, 2025                                   MPI_INFO_ENV(3)