MPI_File_read_all(3) Open MPI MPI_File_read_all(3)
NAME
MPI_File_read_all - Reads a file starting at the locations specified by
individual file pointers (blocking, collective).
SYNTAX
C Syntax
#include <mpi.h>
int MPI_File_read_all(MPI_File fh, void *buf,
int count, MPI_Datatype datatype, MPI_Status *status)
Fortran Syntax
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_READ_ALL(FH, BUF, COUNT,
DATATYPE, STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE),IERROR
Fortran 2008 Syntax
USE mpi_f08
MPI_File_read_all(fh, buf, count, datatype, status, ierror)
TYPE(MPI_File), INTENT(IN) :: fh
TYPE(*), DIMENSION(..) :: buf
INTEGER, INTENT(IN) :: count
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Status) :: status
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
C++ Syntax
#include <mpi.h>
void MPI::File::Read_all(void* buf, int count,
const MPI::Datatype& datatype, MPI::Status& status)
void MPI::File::Read_all(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 (choice).
status Status object (status).
IERROR Fortran only: Error status (integer).
DESCRIPTION
MPI_File_read_all is a collective routine that attempts to read from
the file associated with fh (at the current individual file pointer po-
sition 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_all 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_ER-
RORS_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.
4.1.2 Nov 24, 2021 MPI_File_read_all(3)
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