MPI_File_write_all_begin - Online Linux Manual PageSection : 3
Updated : Jan 21, 2016
Source : 1.10.2
Note : Open MPI

NAMEMPI_File_write_all_begin − Writes a file starting at the locations specified by individual file pointers; beginning part of a split collective routine (nonblocking).

SYNTAXC Syntax #include <mpi.h> int MPI_File_write_all_begin(MPI_File fh, const 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 PARAMETERfh  File handle (handle).

INPUT PARAMETERSbuf  Initial address of buffer (choice). count  Number of elements in buffer (integer). datatype  Data type of each buffer element (handle).

OUTPUT PARAMETERIERROR  Fortran only: Error status (integer).

DESCRIPTIONMPI_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.

NOTESAll 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.

ERRORSAlmost 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. 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.
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