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MPI_File_read_all_begin.3.rst

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MPI_File_read_all_begin

:ref:`MPI_File_read_all_begin` - Reads a file starting at the locations specified by individual file pointers; beginning part of a split collective routine (nonblocking).

SYNTAX

C Syntax

#include <mpi.h>

int MPI_File_read_all_begin(MPI_File fh, void *buf,
     int count, MPI_Datatype datatype)

Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_READ_ALL_BEGIN(FH, BUF, COUNT, DATATYPE, IERROR)
     <type>  BUF(*)
     INTEGER FH, COUNT, DATATYPE, IERROR

Fortran 2008 Syntax

USE mpi_f08
MPI_File_read_all_begin(fh, buf, count, datatype, ierror)
     TYPE(MPI_File), INTENT(IN) :: fh
     TYPE(*), DIMENSION(..), ASYNCHRONOUS :: buf
     INTEGER, INTENT(IN) :: count
     TYPE(MPI_Datatype), INTENT(IN) :: datatype
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT/OUTPUT PARAMETER

  • fh: File handle (handle).

INPUT PARAMETERS

  • count: Number of elements in buffer (integer).
  • datatype: Data type of each buffer element (handle).

OUTPUT PARAMETERS

  • buf: Initial address of buffer (choice).
  • ierror: Fortran only: Error status (integer).

DESCRIPTION

:ref:`MPI_File_read_all_begin` is the beginning part of a split collective operation that attempts to read from 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 into the user's buffer buf. The data is taken out of 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