190 lines
3.8 KiB
Groff
190 lines
3.8 KiB
Groff
.TH MPI_Get 3 "2/3/2025" " " "MPI"
|
|
.SH NAME
|
|
MPI_Get \- Get data from a memory window on a remote process
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.fi
|
|
.nf
|
|
int MPI_Get(void *origin_addr, int origin_count, MPI_Datatype origin_datatype,
|
|
int target_rank, MPI_Aint target_disp, int target_count,
|
|
MPI_Datatype target_datatype, MPI_Win win)
|
|
.fi
|
|
|
|
.nf
|
|
int MPI_Get_c(void *origin_addr, MPI_Count origin_count,
|
|
MPI_Datatype origin_datatype, int target_rank,
|
|
MPI_Aint target_disp, MPI_Count target_count,
|
|
MPI_Datatype target_datatype, MPI_Win win)
|
|
.fi
|
|
|
|
|
|
.SH INPUT PARAMETERS
|
|
.PD 0
|
|
.TP
|
|
.B origin_count
|
|
- number of entries in origin buffer (non-negative integer)
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B origin_datatype
|
|
- datatype of each entry in origin buffer (handle)
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B target_rank
|
|
- rank of target (non-negative integer)
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B target_disp
|
|
- displacement from window start to the beginning of the target buffer (non-negative integer)
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B target_count
|
|
- number of entries in target buffer (non-negative integer)
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B target_datatype
|
|
- datatype of each entry in target buffer (handle)
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B win
|
|
- window object used for communication (handle)
|
|
.PD 1
|
|
|
|
.SH OUTPUT PARAMETERS
|
|
.PD 0
|
|
.TP
|
|
.B origin_addr
|
|
- initial address of origin buffer (choice)
|
|
.PD 1
|
|
|
|
.SH THREAD AND INTERRUPT SAFETY
|
|
|
|
This routine is thread-safe. This means that this routine may be
|
|
safely used by multiple threads without the need for any user-provided
|
|
thread locks. However, the routine is not interrupt safe. Typically,
|
|
this is due to the use of memory allocation routines such as
|
|
.I malloc
|
|
or other non-MPICH runtime routines that are themselves not interrupt-safe.
|
|
|
|
.SH NOTES FOR FORTRAN
|
|
All MPI routines in Fortran (except for
|
|
.I MPI_WTIME
|
|
and
|
|
.I MPI_WTICK
|
|
) have
|
|
an additional argument
|
|
.I ierr
|
|
at the end of the argument list.
|
|
.I ierr
|
|
is an integer and has the same meaning as the return value of the routine
|
|
in C. In Fortran, MPI routines are subroutines, and are invoked with the
|
|
.I call
|
|
statement.
|
|
|
|
All MPI objects (e.g.,
|
|
.I MPI_Datatype
|
|
,
|
|
.I MPI_Comm
|
|
) are of type
|
|
.I INTEGER
|
|
in Fortran.
|
|
|
|
.SH ERRORS
|
|
|
|
All MPI routines (except
|
|
.I MPI_Wtime
|
|
and
|
|
.I MPI_Wtick
|
|
) return an error value;
|
|
C routines as the value of the function and Fortran routines in the last
|
|
argument. Before the value is returned, the current MPI error handler is
|
|
called. By default, this error handler aborts the MPI job. The error handler
|
|
may be changed with
|
|
.I MPI_Comm_set_errhandler
|
|
(for communicators),
|
|
.I MPI_File_set_errhandler
|
|
(for files), and
|
|
.I MPI_Win_set_errhandler
|
|
(for
|
|
RMA windows). The MPI-1 routine
|
|
.I MPI_Errhandler_set
|
|
may be used but
|
|
its use is deprecated. The predefined error handler
|
|
.I MPI_ERRORS_RETURN
|
|
may be used to cause error values to be returned.
|
|
Note that MPI does
|
|
.B not
|
|
guarantee that an MPI program can continue past
|
|
an error; however, MPI implementations will attempt to continue whenever
|
|
possible.
|
|
|
|
.PD 0
|
|
.TP
|
|
.B MPI_SUCCESS
|
|
- No error; MPI routine completed successfully.
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B MPI_ERR_BUFFER
|
|
- Invalid buffer pointer. Usually a null buffer where
|
|
one is not valid.
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B MPI_ERR_COUNT
|
|
- Invalid count argument. Count arguments must be
|
|
non-negative; a count of zero is often valid.
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B MPI_ERR_DISP
|
|
-
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B MPI_ERR_RANK
|
|
- Invalid source or destination rank. Ranks must be between
|
|
zero and the size of the communicator minus one; ranks in a receive
|
|
(
|
|
.I MPI_Recv
|
|
,
|
|
.I MPI_Irecv
|
|
,
|
|
.I MPI_Sendrecv
|
|
, etc.) may also be
|
|
.I MPI_ANY_SOURCE
|
|
\&.
|
|
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B MPI_ERR_TYPE
|
|
- Invalid datatype argument. Additionally, this error can
|
|
occur if an uncommitted MPI_Datatype (see
|
|
.I MPI_Type_commit
|
|
) is used
|
|
in a communication call.
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B MPI_ERR_WIN
|
|
- Invalid MPI window object
|
|
.PD 1
|
|
.PD 0
|
|
.TP
|
|
.B MPI_ERR_OTHER
|
|
- Other error; use
|
|
.I MPI_Error_string
|
|
to get more information
|
|
about this error code.
|
|
.PD 1
|
|
|
|
.SH SEE ALSO
|
|
MPI_Rget
|
|
.br
|