DeinoMPI

The Great and Terrible implementation of MPI-2

MPI_Type_size

Return the number of bytes occupied by entries in the datatype

int MPI_Type_size(
  MPI_Datatype datatype,
  int *size
);

Parameters

datatype: [in] datatype (handle)
size: [out] datatype size (integer)

Remarks

MPI_TYPE_SIZE returns the total size, in bytes, of the entries in the type signature associated with datatype; i.e., the total size of the data in a message that would be created with this datatype. Entries that occur multiple times in the datatype are counted with their multiplicity.

Thread and Interrupt Safety

This routine is both thread- and interrupt-safe. This means that this routine may safely be used by multiple threads and from within a signal handler.

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. ierris an integer and has the same meaning as the return value of 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) are of type INTEGERin Fortran.

Errors

All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value; C routines as the value of the function and Fortran routines in the last argument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but its use is deprecated. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible.

MPI_SUCCESS: No error; MPI routine completed successfully.

MPI_ERR_TYPE: Invalid datatype argument. May be an uncommitted MPI_Datatype (see MPI_Type_commit).

MPI_ERR_ARG: Invalid argument. Some argument is invalid and is not identified by a specific error class (e.g., MPI_ERR_RANK).

Example Code

The following sample code illustrates MPI_Type_size.

#include "mpi.h"
#include <stdio.h>
#include <string.h>

int main(int argc, char **argv)
{
    int mpi_err, errs = 0, size;
    MPI_Aint lb, ub, extent;
    MPI_Datatype type;
    struct { float a; int b; } foo;

    MPI_Init(&argc, &argv);

    type = MPI_INT;
    MPI_Type_size(type, &size);
    if (size != sizeof(int)) {
        fprintf(stderr, "MPI_Type_size of MPI_INT incorrect size (%d); should be %d.\n", size, (int) sizeof(int));fflush(stderr);
        errs++;
    }

    MPI_Type_get_extent(type, &lb, &extent);
    if (extent != sizeof(int)) {
        fprintf(stderr, "MPI_Type_get_extent of MPI_INT returned incorrect extent (%d); should be %d.\n", (int) extent, (int) sizeof(int));fflush(stderr);
        errs++;
    }
    if (lb != 0) {
        fprintf(stderr, "MPI_Type_get_extent of MPI_INT returned incorrect lb (%d); should be 0.\n", (int) lb);fflush(stderr);
        errs++;
    }

    MPI_Type_ub(type, &ub);
    if (ub != extent - lb) {
        fprintf(stderr, "MPI_Type_ub of MPI_INT returned incorrect ub (%d); should be %d.\n", (int) ub, (int) (extent - lb));fflush(stderr);
        errs++;
    }

    type = MPI_FLOAT_INT;
    MPI_Type_size(type, &size);
    if (size != sizeof(float) + sizeof(int)) {
        fprintf(stderr, "MPI_Type_size of MPI_FLOAT_INT returned incorrect size (%d); should be %d.\n", size, (int) (sizeof(float) + sizeof(int)));fflush(stderr);
        errs++;
    }

    MPI_Type_get_extent(type, &lb, &extent);
    if (extent != sizeof(foo)) {
        fprintf(stderr, "MPI_Type_get_extent of MPI_FLOAT_INT returned incorrect extent (%d); should be %d.\n", (int) extent, (int) sizeof(foo));fflush(stderr);
        errs++;
    }
    if (lb != 0) {
        fprintf(stderr, "MPI_Type_get_extent of MPI_FLOAT_INT returned incorrect lb (%d); should be 0.\n", (int) lb);fflush(stderr);
        errs++;
    }

    MPI_Type_ub(type, &ub);
    if (ub != extent - lb) {
        fprintf(stderr, "MPI_Type_ub of MPI_FLOAT_INT returned incorrect ub (%d); should be %d.\n", (int) ub, (int) (extent - lb));fflush(stderr);
        errs++;
    }

    MPI_Finalize();
    return errs;
}

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