Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages

RedHat 9 (Linux i386) - man page for mpi_scatter (redhat section 3)

MPI_Scatter(3)				     LAM/MPI				   MPI_Scatter(3)

NAME
       MPI_Scatter -  Sends data from one task to all other tasks in a group

SYNOPSIS
       #include <mpi.h>
       int MPI_Scatter(void *sbuf, int scount, 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 )
       scount - number of elements sent to each process (integer, significant only at root )
       sdtype - data type of send buffer elements (significant only at root ) (handle)
       rcount - number of elements in receive buffer (integer)
       rdtype - data type of receive buffer elements (handle)
       root   - rank of sending process (integer)
       comm   - communicator (handle)

OUTPUT PARAMETER
       rbuf   - address of receive buffer (choice)

USAGE WITH IMPI EXTENSIONS
       LAM/MPI	does not yet support invoking this function on a communicator that contains ranks
       that are non-local IMPI procs.

NOTES FOR FORTRAN
       All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argu-
       ment 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 excep-
       tions 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_COMM
	      -  Invalid  communicator.   LAM/MPI  does  not  yet support invoking collectives on
	      intercommunicators.
       MPI_ERR_COMM
	      - 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 col-
	      lectives 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_com-
	      mit ).
       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.

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  for-
       matting, and some initial text for most of the MPI-1 man pages.

LOCATION
       scatter.c

LAM/MPI 6.5.8				    11/10/2002				   MPI_Scatter(3)


All times are GMT -4. The time now is 10:52 PM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
UNIX.COM Login
Username:
Password:  
Show Password