MPI_File_iread(3) MPI-2 MPI_File_iread(3)NAME
MPI_File_iread - Nonblocking read using individual file pointer
SYNOPSIS
#include "mpi.h"
int MPI_File_iread(MPI_File fh, void *buf, int count,
MPI_Datatype datatype, MPIO_Request *request)
INPUT PARAMETERS
fh - file handle (handle)
count - number of elements in buffer (nonnegative integer)
datatype
- datatype of each buffer element (handle)
OUTPUT PARAMETERS
buf - initial address of buffer (choice)
request
- request object (handle)
NOTES FOR FORTRAN
All MPI routines in Fortran (except for 'MPI_WTIME' and 'MPI_WTICK') have an additional argument 'ierr' at the end of the argument list.
the routine in C. In Fortran, MPI routines are subroutines and are invoked with the 'call' statement.
All MPI objects (e.g., 'MPI_Datatype', 'MPI_Comm', 'MPI_File') are of type 'INTEGER' in Fortran.
8/31/1998 MPI_File_iread(3)
Check Out this Related Man Page
MPI_File_iread(3OpenMPI)MPI_File_iread(3OpenMPI)NAME
MPI_File_iread - Reads a file starting at the location specified by the individual file pointer (nonblocking, noncollective).
SYNTAX
C Syntax
#include <mpi.h>
int MPI_File_iread(MPI_File fh, void *buf, int count,
MPI_Datatype datatype, MPI_Request *request)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_FILE_IREAD(FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR
C++ Syntax
#include <mpi.h>
MPI::Request MPI::File::Iread(void* buf, int count,
const MPI::Datatype& datatype)
INPUT /OUTPUT PARAMETER
fh File handle (handle).
INPUT PARAMETERS
count Number of elements in the buffer (integer).
datatype Data type of each buffer element (handle).
OUTPUT PARAMETERS
buf Initial address of buffer (choice).
request Request object (handle).
IERROR Fortran only: Error status (integer).
DESCRIPTION
MPI_File_iread is a nonblocking version of MPI_File_read. It attempts to read from the file associated with fh at the current individual
file pointer position maintained by the system in which a total number of count data items having datatype type are read into the user's
buffer buf. The data is taken out of those parts of the file specified by the current view. MPI_File_iread stores the number of data-type
elements actually read in status. All other fields of status are undefined. It is erroneous to call this function if MPI_MODE_SEQUENTIAL
mode was specified when the file was opened.
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_iread(3OpenMPI)
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