mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-30 08:23:01 +00:00
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/*
|
|
* Copyright (c) 2003, 2007-14 Matteo Frigo
|
|
* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include "ifftw-mpi.h"
|
|
|
|
INT XM(num_blocks)(INT n, INT block)
|
|
{
|
|
return (n + block - 1) / block;
|
|
}
|
|
|
|
int XM(num_blocks_ok)(INT n, INT block, MPI_Comm comm)
|
|
{
|
|
int n_pes;
|
|
MPI_Comm_size(comm, &n_pes);
|
|
return n_pes >= XM(num_blocks)(n, block);
|
|
}
|
|
|
|
/* Pick a default block size for dividing a problem of size n among
|
|
n_pes processes. Divide as equally as possible, while minimizing
|
|
the maximum block size among the processes as well as the number of
|
|
processes with nonzero blocks. */
|
|
INT XM(default_block)(INT n, int n_pes)
|
|
{
|
|
return ((n + n_pes - 1) / n_pes);
|
|
}
|
|
|
|
/* For a given block size and dimension n, compute the block size
|
|
on the given process. */
|
|
INT XM(block)(INT n, INT block, int which_block)
|
|
{
|
|
INT d = n - which_block * block;
|
|
return d <= 0 ? 0 : (d > block ? block : d);
|
|
}
|
|
|
|
static INT num_blocks_kind(const ddim *dim, block_kind k)
|
|
{
|
|
return XM(num_blocks)(dim->n, dim->b[k]);
|
|
}
|
|
|
|
INT XM(num_blocks_total)(const dtensor *sz, block_kind k)
|
|
{
|
|
if (FINITE_RNK(sz->rnk)) {
|
|
int i;
|
|
INT ntot = 1;
|
|
for (i = 0; i < sz->rnk; ++i)
|
|
ntot *= num_blocks_kind(sz->dims + i, k);
|
|
return ntot;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
int XM(idle_process)(const dtensor *sz, block_kind k, int which_pe)
|
|
{
|
|
return (which_pe >= XM(num_blocks_total)(sz, k));
|
|
}
|
|
|
|
/* Given a non-idle process which_pe, computes the coordinate
|
|
vector coords[rnk] giving the coordinates of a block in the
|
|
matrix of blocks. k specifies whether we are talking about
|
|
the input or output data distribution. */
|
|
void XM(block_coords)(const dtensor *sz, block_kind k, int which_pe,
|
|
INT *coords)
|
|
{
|
|
int i;
|
|
A(!XM(idle_process)(sz, k, which_pe) && FINITE_RNK(sz->rnk));
|
|
for (i = sz->rnk - 1; i >= 0; --i) {
|
|
INT nb = num_blocks_kind(sz->dims + i, k);
|
|
coords[i] = which_pe % nb;
|
|
which_pe /= nb;
|
|
}
|
|
}
|
|
|
|
INT XM(total_block)(const dtensor *sz, block_kind k, int which_pe)
|
|
{
|
|
if (XM(idle_process)(sz, k, which_pe))
|
|
return 0;
|
|
else {
|
|
int i;
|
|
INT N = 1, *coords;
|
|
STACK_MALLOC(INT*, coords, sizeof(INT) * sz->rnk);
|
|
XM(block_coords)(sz, k, which_pe, coords);
|
|
for (i = 0; i < sz->rnk; ++i)
|
|
N *= XM(block)(sz->dims[i].n, sz->dims[i].b[k], coords[i]);
|
|
STACK_FREE(coords);
|
|
return N;
|
|
}
|
|
}
|
|
|
|
/* returns whether sz is local for dims >= dim */
|
|
int XM(is_local_after)(int dim, const dtensor *sz, block_kind k)
|
|
{
|
|
if (FINITE_RNK(sz->rnk))
|
|
for (; dim < sz->rnk; ++dim)
|
|
if (XM(num_blocks)(sz->dims[dim].n, sz->dims[dim].b[k]) > 1)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
int XM(is_local)(const dtensor *sz, block_kind k)
|
|
{
|
|
return XM(is_local_after)(0, sz, k);
|
|
}
|
|
|
|
/* Return whether sz is distributed for k according to a simple
|
|
1d block distribution in the first or second dimensions */
|
|
int XM(is_block1d)(const dtensor *sz, block_kind k)
|
|
{
|
|
int i;
|
|
if (!FINITE_RNK(sz->rnk)) return 0;
|
|
for (i = 0; i < sz->rnk && num_blocks_kind(sz->dims + i, k) == 1; ++i) ;
|
|
return(i < sz->rnk && i < 2 && XM(is_local_after)(i + 1, sz, k));
|
|
|
|
}
|