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MPI_File_read_all_begin(3) man page (version 1.2.9)

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NAME

       MPI_File_read_all_begin - Reads a file starting at the locations speci-
       fied 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
           INCLUDE 'mpif.h'
           MPI_FILE_READ_ALL_BEGIN(FH, BUF, COUNT, DATATYPE, IERROR)
                 <TYPE>         BUF(*)
                 INTEGER        FH, COUNT, DATATYPE, IERROR

C++ Syntax

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

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

       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 Sec-
       tion 9.4.5 of the MPI-2 standard.

ERRORS

       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 200MPI_File_read_all_begin(3OpenMPI)



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