59 строки
2.3 KiB
Groff
59 строки
2.3 KiB
Groff
.\"Copyright 2006, Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Cart_rank 3OpenMPI "September 2006" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_Cart_rank \fP \- Determines process rank in communicator given Cartesian location.
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.SH SYNTAX
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.ft R
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.SH C Syntax
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.nf
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#include <mpi.h>
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int MPI_Cart_rank(MPI_Comm \fIcomm\fP, int\fI *coords\fP, int\fI *rank\fP)
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.SH Fortran Syntax
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.nf
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INCLUDE 'mpif.h'
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MPI_CART_RANK(\fICOMM, COORDS, RANK, IERROR\fP)
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INTEGER \fICOMM, COORDS(*), RANK, IERROR\fP
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.SH C++ Syntax
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.nf
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#include <mpi.h>
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int Cartcomm::Get_cart_rank(const int \fIcoords\fP[]) const
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.SH INPUT PARAMETERS
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.ft R
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.TP 1i
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comm
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Communicator with Cartesian structure (handle).
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.TP 1i
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coords
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Integer array (of size ndims, which was defined by MPI_Cart_create call) specifying the Cartesian coordinates of a process.
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.SH OUTPUT PARAMETER
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.ft R
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.TP 1i
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rank
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Rank of specified process (integer).
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.ft R
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.TP 1i
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IERROR
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Fortran only: Error status (integer).
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.SH DESCRIPTION
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.ft R
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For a process group with Cartesian structure, the function MPI_Cart_rank
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translates the logical process coordinates to process ranks as they are used by the point-to-point routines. For dimension i with periods(i) = true, if the coordinate, coords(i), is out of range, that is, coords(i) < 0 or coords(i) >= dims(i), it is shifted back to the interval 0 =< coords(i) < dims(i) automatically. Out-of-range coordinates are erroneous for nonperiodic dimensions.
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.SH ERRORS
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Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI:Exception object.
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.sp
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Before the error value is returned, the current MPI error handler is
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called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.
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.SH SEE ALSO
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.sp
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MPI_Cart_create
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' @(#)MPI_Cart_rank.3 1.20 06/03/09
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