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MPI_INFO_ENV - Static MPI_Info object containing info about the application
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.
- 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.
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.
MPI_Info_get
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