mpi_type_match_size(3openmpi) [osx man page]

MPI_Type_match_size(3OpenMPI)											     MPI_Type_match_size(3OpenMPI)

NAME

       MPI_Type_match_size - Returns an MPI datatype of a given type and size

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Type_match_size(int typeclass, int size,
	    MPI_Datatype *type)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_TYPE_MATCH_SIZE(TYPECLASS, SIZE, TYPE, IERROR)
	    INTEGER   TYPECLASS, SIZE, TYPE, IERROR

C++ Syntax
       #include <mpi.h>
       static MPI::Datatype MPI::Match_size(int typeclass, int size)

INPUT PARAMETERS

       typeclass Generic type specifier (integer).

       size	 Size, in bytes, of representation (integer).

OUTPUT PARAMETERS

       type	 Datatype with correct type and size (handle).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       The  function  returns  an MPI datatype matching a local variable of type (typeclass, size). The returned type is a reference (handle) to a
       predefined named datatype, not a duplicate. This type cannot be freed.

       The value of typeclass may be set to one of MPI_TYPECLASS_REAL,	MPI_TYPECLASS_INTEGER,	or  MPI_TYPECLASS_COMPLEX,  corresponding  to  the
       desired datatype.

       MPI_type_match_size can be used to obtain a size-specific type that matches a Fortran numeric intrinsic type: first call MPI_Sizeof to com-
       pute the variable size, then call MPI_Type_match_size to find a suitable datatype. In  C  and  C++,  use  the  sizeof  builtin  instead	of
       MPI_Sizeof.

       It is erroneous to specify a size not supported by the compiler.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
       tions 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.

       Before  the error value is returned, the current MPI error handler is 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.

       See the MPI man page for a full list of MPI error codes.

SEE ALSO

       MPI_Sizeof
       MPI_Type_get_extent

Open MPI 1.2							  September 2006				     MPI_Type_match_size(3OpenMPI)

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MPI_Type_commit(3OpenMPI)												 MPI_Type_commit(3OpenMPI)

NAME

       MPI_Type_commit - Commits a data type.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Type_commit(MPI_Datatype *datatype)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_TYPE_COMMIT(DATATYPE, IERROR)
	    INTEGER   DATATYPE, IERROR

C++ Syntax
       #include <mpi.h>
       void Datatype::Commit()

INPUT PARAMETER

       datatype  Data type (handle).

OUTPUT PARAMETER

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       The  commit  operation commits the data type. A data type is the formal description of a communication buffer, not the content of that buf-
       fer. After a data type has been committed, it can be repeatedly reused to communicate the changing content of a buffer or, indeed, the con-
       tent of different buffers, with different starting addresses.

       Example: The following Fortran code fragment gives examples of using MPI_Type_commit.

	   INTEGER type1, type2
	   CALL MPI_TYPE_CONTIGUOUS(5, MPI_REAL, type1, ierr)
			 ! new type object created
	   CALL MPI_TYPE_COMMIT(type1, ierr)
			 ! now type1 can be used for communication

       If the data type specified in datatype is already committed, it is equivalent to a no-op.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
       tions 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.

       Before  the error value is returned, the current MPI error handler is 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.

Open MPI 1.2							  September 2006					 MPI_Type_commit(3OpenMPI)

Linux and UNIX Man Pages

mpi_type_match_size(3openmpi) [osx man page]

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