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/* StarPU --- Runtime system for heterogeneous multicore architectures.
*
* Copyright (C) 2009-2011 Université de Bordeaux 1
* Copyright (C) 2010, 2011, 2012 Centre National de la Recherche Scientifique
*
* StarPU is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* StarPU is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* See the GNU Lesser General Public License in COPYING.LGPL for more details.
*/
#include <starpu_mpi_datatype.h>
/*
* MPI_* functions usually requires both a pointer to the first element of
* a datatype and the datatype itself, so we need to provide both.
*/
typedef int (*handle_to_datatype_func)(starpu_data_handle_t, MPI_Datatype *);
typedef void *(*handle_to_ptr_func)(starpu_data_handle_t);
/*
* Matrix
*/
static int handle_to_datatype_matrix(starpu_data_handle_t data_handle, MPI_Datatype *datatype)
{
int ret;
unsigned nx = starpu_matrix_get_nx(data_handle);
unsigned ny = starpu_matrix_get_ny(data_handle);
unsigned ld = starpu_matrix_get_local_ld(data_handle);
size_t elemsize = starpu_matrix_get_elemsize(data_handle);
ret = MPI_Type_vector(ny, nx*elemsize, ld*elemsize, MPI_BYTE, datatype);
STARPU_ASSERT(ret == MPI_SUCCESS);
ret = MPI_Type_commit(datatype);
STARPU_ASSERT(ret == MPI_SUCCESS);
return 0;
}
/*
* Block
*/
static int handle_to_datatype_block(starpu_data_handle_t data_handle, MPI_Datatype *datatype)
{
int ret;
unsigned nx = starpu_block_get_nx(data_handle);
unsigned ny = starpu_block_get_ny(data_handle);
unsigned nz = starpu_block_get_nz(data_handle);
unsigned ldy = starpu_block_get_local_ldy(data_handle);
unsigned ldz = starpu_block_get_local_ldz(data_handle);
size_t elemsize = starpu_block_get_elemsize(data_handle);
MPI_Datatype datatype_2dlayer;
ret = MPI_Type_vector(ny, nx*elemsize, ldy*elemsize, MPI_BYTE, &datatype_2dlayer);
STARPU_ASSERT(ret == MPI_SUCCESS);
ret = MPI_Type_commit(&datatype_2dlayer);
STARPU_ASSERT(ret == MPI_SUCCESS);
ret = MPI_Type_hvector(nz, 1, ldz*elemsize, datatype_2dlayer, datatype);
STARPU_ASSERT(ret == MPI_SUCCESS);
ret = MPI_Type_commit(datatype);
STARPU_ASSERT(ret == MPI_SUCCESS);
return 0;
}
/*
* Vector
*/
static int handle_to_datatype_vector(starpu_data_handle_t data_handle, MPI_Datatype *datatype)
{
int ret;
unsigned nx = starpu_vector_get_nx(data_handle);
size_t elemsize = starpu_vector_get_elemsize(data_handle);
ret = MPI_Type_contiguous(nx*elemsize, MPI_BYTE, datatype);
STARPU_ASSERT(ret == MPI_SUCCESS);
ret = MPI_Type_commit(datatype);
STARPU_ASSERT(ret == MPI_SUCCESS);
return 0;
}
/*
* Variable
*/
static int handle_to_datatype_variable(starpu_data_handle_t data_handle, MPI_Datatype *datatype)
{
int ret;
size_t elemsize = starpu_variable_get_elemsize(data_handle);
ret = MPI_Type_contiguous(elemsize, MPI_BYTE, datatype);
STARPU_ASSERT(ret == MPI_SUCCESS);
ret = MPI_Type_commit(datatype);
STARPU_ASSERT(ret == MPI_SUCCESS);
return 0;
}
/*
* Generic
*/
static handle_to_datatype_func handle_to_datatype_funcs[STARPU_MAX_INTERFACE_ID] =
{
[STARPU_MATRIX_INTERFACE_ID] = handle_to_datatype_matrix,
[STARPU_BLOCK_INTERFACE_ID] = handle_to_datatype_block,
[STARPU_VECTOR_INTERFACE_ID] = handle_to_datatype_vector,
[STARPU_CSR_INTERFACE_ID] = NULL,
[STARPU_BCSR_INTERFACE_ID] = NULL,
[STARPU_VARIABLE_INTERFACE_ID] = handle_to_datatype_variable,
[STARPU_VOID_INTERFACE_ID] = NULL,
[STARPU_MULTIFORMAT_INTERFACE_ID] = NULL,
};
int starpu_mpi_handle_to_datatype(starpu_data_handle_t data_handle, MPI_Datatype *datatype)
{
enum starpu_data_interface_id id = starpu_handle_get_interface_id(data_handle);
STARPU_ASSERT_MSG(id <= STARPU_MULTIFORMAT_INTERFACE_ID, "Unknown data interface");
handle_to_datatype_func func = handle_to_datatype_funcs[id];
STARPU_ASSERT(func);
return func(data_handle, datatype);
}
void *starpu_mpi_handle_to_ptr(starpu_data_handle_t data_handle)
{
return (void*) starpu_handle_get_local_ptr(data_handle);
}
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