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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).
C Syntax
#include <mpi.h>
int MPI_File_read_all_begin(MPI_File fh, void *buf,
int count, MPI_Datatype datatype)
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
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
- fh
- File handle (handle).
- count
- Number
of elements in buffer (integer).
- datatype
- Data type of each buffer element
(handle).
- buf
- Initial address of buffer (choice).
- IERROR
- Fortran only: Error status (integer).
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.
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.
Almost
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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