oracular (3) MPI_Info_env.openmpi.3.gz

NAME

       MPI_INFO_ENV - Static MPI_Info object containing info about the application

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

SEE ALSO

       MPI_Info_get