mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-27 15:03:01 +00:00
112 lines
3.8 KiB
C
112 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 "fftw3-mpi.h"
|
|
#include "ifftw-mpi.h"
|
|
#include <string.h>
|
|
|
|
#if SIZEOF_SIZE_T == SIZEOF_UNSIGNED_INT
|
|
# define FFTW_MPI_SIZE_T MPI_UNSIGNED
|
|
#elif SIZEOF_SIZE_T == SIZEOF_UNSIGNED_LONG
|
|
# define FFTW_MPI_SIZE_T MPI_UNSIGNED_LONG
|
|
#elif SIZEOF_SIZE_T == SIZEOF_UNSIGNED_LONG_LONG
|
|
# define FFTW_MPI_SIZE_T MPI_UNSIGNED_LONG_LONG
|
|
#else
|
|
# error MPI type for size_t is unknown
|
|
# define FFTW_MPI_SIZE_T MPI_UNSIGNED_LONG
|
|
#endif
|
|
|
|
/* Import wisdom from all processes to process 0, as prelude to
|
|
exporting a single wisdom file (this is convenient when we are
|
|
running on identical processors, to avoid the annoyance of having
|
|
per-process wisdom files). In order to make the time for this
|
|
operation logarithmic in the number of processors (rather than
|
|
linear), we employ a tree reduction algorithm. This means that the
|
|
wisdom is modified on processes other than root, which shouldn't
|
|
matter in practice. */
|
|
void XM(gather_wisdom)(MPI_Comm comm_)
|
|
{
|
|
MPI_Comm comm, comm2;
|
|
int my_pe, n_pes;
|
|
char *wis;
|
|
size_t wislen;
|
|
MPI_Status status;
|
|
|
|
MPI_Comm_dup(comm_, &comm);
|
|
MPI_Comm_rank(comm, &my_pe);
|
|
MPI_Comm_size(comm, &n_pes);
|
|
|
|
if (n_pes > 2) { /* recursively split into even/odd processes */
|
|
MPI_Comm_split(comm, my_pe % 2, my_pe, &comm2);
|
|
XM(gather_wisdom)(comm2);
|
|
MPI_Comm_free(&comm2);
|
|
}
|
|
if (n_pes > 1 && my_pe < 2) { /* import process 1 -> 0 */
|
|
if (my_pe == 1) {
|
|
wis = X(export_wisdom_to_string)();
|
|
wislen = strlen(wis) + 1;
|
|
MPI_Send(&wislen, 1, FFTW_MPI_SIZE_T, 0, 111, comm);
|
|
MPI_Send(wis, wislen, MPI_CHAR, 0, 222, comm);
|
|
free(wis);
|
|
}
|
|
else /* my_pe == 0 */ {
|
|
MPI_Recv(&wislen, 1, FFTW_MPI_SIZE_T, 1, 111, comm, &status);
|
|
wis = (char *) MALLOC(wislen * sizeof(char), OTHER);
|
|
MPI_Recv(wis, wislen, MPI_CHAR, 1, 222, comm, &status);
|
|
if (!X(import_wisdom_from_string)(wis))
|
|
MPI_Abort(comm, 1);
|
|
X(ifree)(wis);
|
|
}
|
|
}
|
|
MPI_Comm_free(&comm);
|
|
}
|
|
|
|
/* broadcast wisdom from process 0 to all other processes; this
|
|
is useful so that we can import wisdom once and not worry
|
|
about parallel I/O or process-specific wisdom, although of
|
|
course it assumes that all the processes have identical
|
|
performance characteristics (i.e. identical hardware). */
|
|
void XM(broadcast_wisdom)(MPI_Comm comm_)
|
|
{
|
|
MPI_Comm comm;
|
|
int my_pe;
|
|
char *wis;
|
|
size_t wislen;
|
|
|
|
MPI_Comm_dup(comm_, &comm);
|
|
MPI_Comm_rank(comm, &my_pe);
|
|
|
|
if (my_pe != 0) {
|
|
MPI_Bcast(&wislen, 1, FFTW_MPI_SIZE_T, 0, comm);
|
|
wis = (char *) MALLOC(wislen * sizeof(char), OTHER);
|
|
MPI_Bcast(wis, wislen, MPI_CHAR, 0, comm);
|
|
if (!X(import_wisdom_from_string)(wis))
|
|
MPI_Abort(comm, 1);
|
|
X(ifree)(wis);
|
|
}
|
|
else /* my_pe == 0 */ {
|
|
wis = X(export_wisdom_to_string)();
|
|
wislen = strlen(wis) + 1;
|
|
MPI_Bcast(&wislen, 1, FFTW_MPI_SIZE_T, 0, comm);
|
|
MPI_Bcast(wis, wislen, MPI_CHAR, 0, comm);
|
|
X(free)(wis);
|
|
}
|
|
MPI_Comm_free(&comm);
|
|
}
|