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NAME
MPI_File_read - Reads a file starting at the location specified by the
individual file pointer (blocking, noncollective).
SYNTAX
C Syntax
#include <mpi.h>
int MPI_File_read(MPI_File fh, void *buf,
int count, MPI_Datatype datatype, MPI_Status *status)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_FILE_READ( FH, BUF, COUNT,
DATATYPE, STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE),
IERROR
C++ Syntax
#include <mpi.h>
void MPI::File::Read(void* buf, int count,
const MPI::Datatype& datatype, MPI::Status& status)
void MPI::File::Read(void* buf, int count,
const MPI::Datatype& datatype)
INPUT PARAMETERS
fh File handle (handle).
count Number of elements in buffer (integer).
datatype Data type of each buffer element (handle).
OUTPUT PARAMETERS
buf Initial address of buffer (integer).
status Status object (status).
IERROR Fortran only: Error status (integer).
DESCRIPTION
MPI_File_read 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. MPI_File_read stores the number of data-type ele-
ments actually read in status. All other fields of status are unde-
fined.
It is erroneous to call this function if MPI_MODE_SEQUENTIAL mode was
specified when the file was opened.
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_read(3OpenMPI)
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