mpi_file_iwrite(3openmpi) [osx man page]

MPI_File_iwrite(3OpenMPI)												 MPI_File_iwrite(3OpenMPI)

NAME

       MPI_File_iwrite - Writes a file starting at the location specified by the individual file pointer (nonblocking, noncollective).

SYNTAX

       C Syntax
	   #include <mpi.h>
	   int MPI_File_iwrite(MPI_File fh, void *buf, int count,
		  MPI_Datatype datatype, MPI_Request *request)

       Fortran Syntax
	   INCLUDE 'mpif.h'
	   MPI_FILE_IWRITE(FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
		 <TYPE> 	BUF(*)
		 INTEGER	FH, COUNT, DATATYPE, REQUEST, IERROR

C++ Syntax
       #include <mpi.h>
       MPI::Request MPI::File::Iwrite(const void* buf, int count,
	    const MPI::Datatype& datatype)

INPUT
/OUTPUT PARAMETER
       fh	 File handle (handle).

INPUT PARAMETERS

       buf	 Initial address of buffer (choice).

       count	 Number of elements in buffer (integer).

       datatype  Data type of each buffer element (handle).

OUTPUT PARAMETER

       request	 Request object (handle).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_iwrite	is  a  nonblocking  version of the MPI_File_write interface. It attempts to write into the file associated with fh (at the
       current individual file pointer position maintained by the system) a total number of count data items having datatype type from the  user's
       buffer  buf.  The data is written into those parts of the file specified by the current view. MPI_File_iwrite stores the number of datatype
       elements actually written in status.  All other fields of status are undefined.

       It is erroneous to call this function if MPI_MODE_SEQENTIAL mode was specified when the file was open.

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. For MPI I/O function errors, the default error handler is  set
       to  MPI_ERRORS_RETURN. The error handler may be changed with MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL may
       be used to make I/O errors fatal. Note that MPI does not guarantee that an MPI program can continue past an error.

Open MPI 1.2							  September 2006					 MPI_File_iwrite(3OpenMPI)

MPI_File_write_all_begin(3OpenMPI)										MPI_File_write_all_begin(3OpenMPI)

NAME

       MPI_File_write_all_begin - Writes a file starting at the locations specified by individual file pointers; beginning part of a split collec-
       tive routine (nonblocking).

SYNTAX

       C Syntax
	   #include <mpi.h>
	   int MPI_File_write_all_begin(MPI_File fh, void *buf,
		  int count, MPI_Datatype datatype)

       Fortran Syntax
	   INCLUDE 'mpif.h'
	   MPI_FILE_WRITE_ALL_BEGIN(FH, BUF, COUNT, DATATYPE, IERROR)
		 <type> 	BUF(*)
		 INTEGER	FH, COUNT, DATATYPE, IERROR

C++ Syntax
       #include <mpi.h>
       void MPI::File::Write_all_begin(const void* buf, int count,
	    const MPI::Datatype& datatype)

INPUT
/OUTPUT PARAMETER
       fh	 File handle (handle).

INPUT PARAMETERS

       buf	 Initial address of buffer (choice).

       count	 Number of elements in buffer (integer).

       datatype  Data type of each buffer element (handle).

OUTPUT PARAMETER

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_write_all_begin is the beginning part of a split collective, nonblocking routine that attempts to write into the  file	associated
       with  fh (at the current individual file pointer position maintained by the system) a total number of count data items having datatype type
       from the user's buffer buf.  The data is written into those parts of the file specified by the current view.

NOTES

       All the nonblocking collective routines for data access are "split" into two routines, each with _begin or _end as a  suffix.  These  split
       collective routines are subject to the semantic rules described in Section 9.4.5 of the MPI-2 standard.

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. For MPI I/O function errors, the default error handler is set
       to MPI_ERRORS_RETURN. The error handler may be changed with MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL  may
       be used to make I/O errors fatal. Note that MPI does not guarantee that an MPI program can continue past an error.

Open MPI 1.2							  September 2006				MPI_File_write_all_begin(3OpenMPI)