NAME
MPI_Scatterv - Scatters a buffer in parts to all tasks in a group
SYNOPSIS
#include <mpi.h>
int MPI_Scatterv(void *sbuf, int *scounts, int *disps,
MPI_Datatype sdtype, void* rbuf, int rcount,
MPI_Datatype rdtype, int root, MPI_Comm comm)
INPUT PARAMETERS
sbuf - address of send buffer (choice, significant only at root )
scounts
- integer array (of length group size) specifying the number of
elements to send to each processor
disps - integer array (of length group size). Entry i specifies the
displacement (relative to sendbuf from which to take the
outgoing data to process i
sdtype - data type of send buffer elements (handle)
rcount - number of elements in receive buffer (integer)
rtype - data type of receive buffer elements (handle)
root - rank of sending process (integer)
comm - communicator (handle)
OUTPUT PARAMETER
rbuf - address of receive buffer (choice)
NOTES FOR FORTRAN
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have
an additional argument ierr at the end of the argument list. 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 call statement.
All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in
Fortran.
ERRORS
If an error occurs in an MPI function, the current MPI error handler is
called to handle it. By default, this error handler aborts the MPI
job. The error handler may be changed with MPI_Errhandler_set ; the
predefined error handler MPI_ERRORS_RETURN may be used to cause error
values to be returned (in C and Fortran; this error handler is less
useful in with the C++ MPI bindings. The predefined error handler
MPI::ERRORS_THROW_EXCEPTIONS should be used in C++ if the error value
needs to be recovered). Note that MPI does not guarantee that an MPI
program can continue past an error.
All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error
value; C routines as the value of the function and Fortran routines in
the last argument. The C++ bindings for MPI do not return error
values; instead, error values are communicated by throwing exceptions
of type MPI::Exception (but not by default). Exceptions are only
thrown if the error value is not MPI::SUCCESS .
Note that if the MPI::ERRORS_RETURN handler is set in C++, while MPI
functions will return upon an error, there will be no way to recover
what the actual error value was.
MPI_SUCCESS
- No error; MPI routine completed successfully.
MPI_ERR_COMM
- Invalid communicator. A common error is to use a null
communicator in a call (not even allowed in MPI_Comm_rank ).
MPI_ERR_OTHER
- A collective implementation was not able to be located at run-
time for this communicator.
MPI_ERR_OTHER
- A communicator that contains some non-local IMPI procs was
used for some function which has not yet had the IMPI extensions
implemented yet. For example, most collectives on IMPI
communicators have not been implemented yet.
MPI_ERR_COUNT
- Invalid count argument. Count arguments must be non-negative;
a count of zero is often valid.
MPI_ERR_TYPE
- Invalid datatype argument. May be an uncommitted MPI_Datatype
(see MPI_Type_commit ).
MPI_ERR_BUFFER
- Invalid buffer pointer. Usually a null buffer where one is
not valid.
MPI_ERR_ROOT
- Invalid root. The root must be specified as a rank in the
communicator. Ranks must be between zero and the size of the
communicator minus one.
MPI_ERR_ARG
- Invalid argument. Some argument is invalid and is not
identified by a specific error class. This is typically a NULL
pointer or other such error.
MORE INFORMATION
For more information, please see the official MPI Forum web site, which
contains the text of both the MPI-1 and MPI-2 standards. These
documents contain detailed information about each MPI function (most of
which is not duplicated in these man pages).
http://www.mpi-forum.org/
ACKNOWLEDGEMENTS
The LAM Team would like the thank the MPICH Team for the handy program
to generate man pages ("doctext" from
ftp://ftp.mcs.anl.gov/pub/sowing/sowing.tar.gz ), the initial
formatting, and some initial text for most of the MPI-1 man pages.
LOCATION
scatterv.c