--- mpi/conf.c 2014-03-04 19:41:03.000000000 +0100
+++ mpi/conf.c 2015-09-05 05:53:19.085516467 +0200
@@ -29,6 +29,8 @@ static const solvtab s =
SOLVTAB(XM(transpose_pairwise_register)),
SOLVTAB(XM(transpose_alltoall_register)),
SOLVTAB(XM(transpose_recurse_register)),
+ SOLVTAB(XM(transpose_pairwise_transposed_register)),
+ SOLVTAB(XM(transpose_alltoall_transposed_register)),
SOLVTAB(XM(dft_rank_geq2_register)),
SOLVTAB(XM(dft_rank_geq2_transposed_register)),
SOLVTAB(XM(dft_serial_register)),
--- mpi/Makefile.am 2013-03-18 13:10:45.000000000 +0100
+++ mpi/Makefile.am 2015-09-05 05:53:19.084516437 +0200
@@ -17,6 +17,7 @@ BUILT_SOURCES = fftw3-mpi.f03.in fftw3-m
CLEANFILES = fftw3-mpi.f03 fftw3l-mpi.f03
TRANSPOSE_SRC = transpose-alltoall.c transpose-pairwise.c transpose-recurse.c transpose-problem.c transpose-solve.c mpi-transpose.h
+TRANSPOSE_SRC += transpose-alltoall-transposed.c transpose-pairwise-transposed.c
DFT_SRC = dft-serial.c dft-rank-geq2.c dft-rank-geq2-transposed.c dft-rank1.c dft-rank1-bigvec.c dft-problem.c dft-solve.c mpi-dft.h
RDFT_SRC = rdft-serial.c rdft-rank-geq2.c rdft-rank-geq2-transposed.c rdft-rank1-bigvec.c rdft-problem.c rdft-solve.c mpi-rdft.h
RDFT2_SRC = rdft2-serial.c rdft2-rank-geq2.c rdft2-rank-geq2-transposed.c rdft2-problem.c rdft2-solve.c mpi-rdft2.h
--- mpi/mpi-transpose.h 2014-03-04 19:41:03.000000000 +0100
+++ mpi/mpi-transpose.h 2015-09-05 05:53:19.085516467 +0200
@@ -59,3 +59,9 @@ int XM(mkplans_posttranspose)(const prob
void XM(transpose_pairwise_register)(planner *p);
void XM(transpose_alltoall_register)(planner *p);
void XM(transpose_recurse_register)(planner *p);
+void XM(transpose_pairwise_transposed_register)(planner *p);
+void XM(transpose_alltoall_transposed_register)(planner *p);
+int XM(mkplans_pretranspose)(const problem_mpi_transpose *p, planner *plnr,
+ R *I, R *O, int my_pe,
+ plan **cld2, plan **cld2rest, plan **cld3,
+ INT *rest_Ioff, INT *rest_Ooff);
--- mpi/transpose-alltoall-transposed.c 1970-01-01 01:00:00.000000000 +0100
+++ mpi/transpose-alltoall-transposed.c 2015-09-05 05:53:19.085516467 +0200
@@ -0,0 +1,280 @@
+/*
+ * Copyright (c) 2003, 2007-11 Matteo Frigo
+ * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
+ * Copyright (c) 2012 Michael Pippig
+ *
+ * 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
+ *
+ */
+
+/* plans for distributed out-of-place transpose using MPI_Alltoall,
+ and which destroy the input array (also if TRANSPOSED_IN is used) */
+
+#include "mpi-transpose.h"
+#include <string.h>
+
+typedef struct {
+ solver super;
+ int copy_transposed_out; /* whether to copy the output for TRANSPOSED_OUT,
+ which makes the first transpose out-of-place
+ but costs an extra copy and requires us
+ to destroy the input */
+} S;
+
+typedef struct {
+ plan_mpi_transpose super;
+
+ plan *cld1, *cld2, *cld2rest, *cld3;
+
+ MPI_Comm comm;
+ int *send_block_sizes, *send_block_offsets;
+ int *recv_block_sizes, *recv_block_offsets;
+
+ INT rest_Ioff, rest_Ooff;
+
+ int equal_blocks;
+} P;
+
+/* transpose locally to get contiguous chunks
+ this may take two transposes if the block sizes are unequal
+ (3 subplans, two of which operate on disjoint data) */
+static void apply_pretranspose(
+ const P *ego, R *I, R *O
+ )
+{
+ plan_rdft *cld2, *cld2rest, *cld3;
+
+ cld3 = (plan_rdft *) ego->cld3;
+ if (cld3)
+ cld3->apply(ego->cld3, O, O);
+ /* else TRANSPOSED_IN is true and user wants I transposed */
+
+ cld2 = (plan_rdft *) ego->cld2;
+ cld2->apply(ego->cld2, I, O);
+ cld2rest = (plan_rdft *) ego->cld2rest;
+ if (cld2rest) {
+ cld2rest->apply(ego->cld2rest,
+ I + ego->rest_Ioff, O + ego->rest_Ooff);
+ }
+}
+
+static void apply(const plan *ego_, R *I, R *O)
+{
+ const P *ego = (const P *) ego_;
+ plan_rdft *cld1 = (plan_rdft *) ego->cld1;
+
+ if (cld1) {
+ /* transpose locally to get contiguous chunks */
+ apply_pretranspose(ego, I, O);
+
+ /* transpose chunks globally */
+ if (ego->equal_blocks)
+ MPI_Alltoall(O, ego->send_block_sizes[0], FFTW_MPI_TYPE,
+ I, ego->recv_block_sizes[0], FFTW_MPI_TYPE,
+ ego->comm);
+ else
+ MPI_Alltoallv(O, ego->send_block_sizes, ego->send_block_offsets,
+ FFTW_MPI_TYPE,
+ I, ego->recv_block_sizes, ego->recv_block_offsets,
+ FFTW_MPI_TYPE,
+ ego->comm);
+
+ /* transpose locally to get non-transposed output */
+ cld1->apply(ego->cld1, I, O);
+ } /* else TRANSPOSED_OUT is true and user wants O transposed */
+ else {
+ /* transpose locally to get contiguous chunks */
+ apply_pretranspose(ego, I, I);
+
+ /* transpose chunks globally */
+ if (ego->equal_blocks)
+ MPI_Alltoall(I, ego->send_block_sizes[0], FFTW_MPI_TYPE,
+ O, ego->recv_block_sizes[0], FFTW_MPI_TYPE,
+ ego->comm);
+ else
+ MPI_Alltoallv(I, ego->send_block_sizes, ego->send_block_offsets,
+ FFTW_MPI_TYPE,
+ O, ego->recv_block_sizes, ego->recv_block_offsets,
+ FFTW_MPI_TYPE,
+ ego->comm);
+ }
+}
+
+static int applicable(const S *ego, const problem *p_,
+ const planner *plnr)
+{
+ /* in contrast to transpose-alltoall this algorithm can not preserve the input,
+ * since we need at least one transpose before the (out-of-place) Alltoall */
+ const problem_mpi_transpose *p = (const problem_mpi_transpose *) p_;
+ return (1
+ && p->I != p->O
+ && (!NO_DESTROY_INPUTP(plnr))
+ && ((p->flags & TRANSPOSED_OUT) || !ego->copy_transposed_out)
+ && ONLY_TRANSPOSEDP(p->flags)
+ );
+}
+
+static void awake(plan *ego_, enum wakefulness wakefulness)
+{
+ P *ego = (P *) ego_;
+ X(plan_awake)(ego->cld1, wakefulness);
+ X(plan_awake)(ego->cld2, wakefulness);
+ X(plan_awake)(ego->cld2rest, wakefulness);
+ X(plan_awake)(ego->cld3, wakefulness);
+}
+
+static void destroy(plan *ego_)
+{
+ P *ego = (P *) ego_;
+ X(ifree0)(ego->send_block_sizes);
+ MPI_Comm_free(&ego->comm);
+ X(plan_destroy_internal)(ego->cld3);
+ X(plan_destroy_internal)(ego->cld2rest);
+ X(plan_destroy_internal)(ego->cld2);
+ X(plan_destroy_internal)(ego->cld1);
+}
+
+static void print(const plan *ego_, printer *p)
+{
+ const P *ego = (const P *) ego_;
+ p->print(p, "(mpi-transpose-alltoall-transposed%s%(%p%)%(%p%)%(%p%)%(%p%))",
+ ego->equal_blocks ? "/e" : "",
+ ego->cld1, ego->cld2, ego->cld2rest, ego->cld3);
+}
+
+static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
+{
+ const S *ego = (const S *) ego_;
+ const problem_mpi_transpose *p;
+ P *pln;
+ plan *cld1 = 0, *cld2 = 0, *cld2rest = 0, *cld3 = 0;
+ INT b, bt, vn, rest_Ioff, rest_Ooff;
+ R *O;
+ int *sbs, *sbo, *rbs, *rbo;
+ int pe, my_pe, n_pes;
+ int equal_blocks = 1;
+ static const plan_adt padt = {
+ XM(transpose_solve), awake, print, destroy
+ };
+
+ if (!applicable(ego, p_, plnr))
+ return (plan *) 0;
+
+ p = (const problem_mpi_transpose *) p_;
+ vn = p->vn;
+
+ MPI_Comm_rank(p->comm, &my_pe);
+ MPI_Comm_size(p->comm, &n_pes);
+
+ bt = XM(block)(p->ny, p->tblock, my_pe);
+
+ if (p->flags & TRANSPOSED_OUT) { /* O stays transposed */
+ if (ego->copy_transposed_out) {
+ cld1 = X(mkplan_f_d)(plnr,
+ X(mkproblem_rdft_0_d)(X(mktensor_1d)
+ (bt * p->nx * vn, 1, 1),
+ p->I, O = p->O),
+ 0, 0, NO_SLOW);
+ if (XM(any_true)(!cld1, p->comm)) goto nada;
+ }
+ else /* first transpose is in-place */
+ O = p->I;
+ }
+ else { /* transpose nx x bt x vn -> bt x nx x vn */
+ cld1 = X(mkplan_f_d)(plnr,
+ X(mkproblem_rdft_0_d)(X(mktensor_3d)
+ (bt, vn, p->nx * vn,
+ p->nx, bt * vn, vn,
+ vn, 1, 1),
+ p->I, O = p->O),
+ 0, 0, NO_SLOW);
+ if (XM(any_true)(!cld1, p->comm)) goto nada;
+ }
+
+ if (XM(any_true)(!XM(mkplans_pretranspose)(p, plnr, p->I, O, my_pe,
+ &cld2, &cld2rest, &cld3,
+ &rest_Ioff, &rest_Ooff),
+ p->comm)) goto nada;
+
+
+ pln = MKPLAN_MPI_TRANSPOSE(P, &padt, apply);
+
+ pln->cld1 = cld1;
+ pln->cld2 = cld2;
+ pln->cld2rest = cld2rest;
+ pln->rest_Ioff = rest_Ioff;
+ pln->rest_Ooff = rest_Ooff;
+ pln->cld3 = cld3;
+
+ MPI_Comm_dup(p->comm, &pln->comm);
+
+ /* Compute sizes/offsets of blocks to send for all-to-all command. */
+ sbs = (int *) MALLOC(4 * n_pes * sizeof(int), PLANS);
+ sbo = sbs + n_pes;
+ rbs = sbo + n_pes;
+ rbo = rbs + n_pes;
+ b = XM(block)(p->nx, p->block, my_pe);
+ bt = XM(block)(p->ny, p->tblock, my_pe);
+ for (pe = 0; pe < n_pes; ++pe) {
+ INT db, dbt; /* destination block sizes */
+ db = XM(block)(p->nx, p->block, pe);
+ dbt = XM(block)(p->ny, p->tblock, pe);
+ if (db != p->block || dbt != p->tblock)
+ equal_blocks = 0;
+
+ /* MPI requires type "int" here; apparently it
+ has no 64-bit API? Grrr. */
+ sbs[pe] = (int) (b * dbt * vn);
+ sbo[pe] = (int) (pe * (b * p->tblock) * vn);
+ rbs[pe] = (int) (db * bt * vn);
+ rbo[pe] = (int) (pe * (p->block * bt) * vn);
+ }
+ pln->send_block_sizes = sbs;
+ pln->send_block_offsets = sbo;
+ pln->recv_block_sizes = rbs;
+ pln->recv_block_offsets = rbo;
+ pln->equal_blocks = equal_blocks;
+
+ X(ops_zero)(&pln->super.super.ops);
+ if (cld1) X(ops_add2)(&cld1->ops, &pln->super.super.ops);
+ if (cld2) X(ops_add2)(&cld2->ops, &pln->super.super.ops);
+ if (cld2rest) X(ops_add2)(&cld2rest->ops, &pln->super.super.ops);
+ if (cld3) X(ops_add2)(&cld3->ops, &pln->super.super.ops);
+ /* FIXME: should MPI operations be counted in "other" somehow? */
+
+ return &(pln->super.super);
+
+ nada:
+ X(plan_destroy_internal)(cld3);
+ X(plan_destroy_internal)(cld2rest);
+ X(plan_destroy_internal)(cld2);
+ X(plan_destroy_internal)(cld1);
+ return (plan *) 0;
+}
+
+static solver *mksolver(int copy_transposed_out)
+{
+ static const solver_adt sadt = { PROBLEM_MPI_TRANSPOSE, mkplan, 0 };
+ S *slv = MKSOLVER(S, &sadt);
+ slv->copy_transposed_out = copy_transposed_out;
+ return &(slv->super);
+}
+
+void XM(transpose_alltoall_transposed_register)(planner *p)
+{
+ int cto;
+ for (cto = 0; cto <= 1; ++cto)
+ REGISTER_SOLVER(p, mksolver(cto));
+}
--- mpi/transpose-pairwise.c 2014-03-04 19:41:03.000000000 +0100
+++ mpi/transpose-pairwise.c 2015-09-05 06:00:05.715433709 +0200
@@ -53,7 +53,6 @@ static void transpose_chunks(int *sched,
{
if (sched) {
int i;
- MPI_Status status;
/* TODO: explore non-synchronous send/recv? */
@@ -74,7 +73,7 @@ static void transpose_chunks(int *sched,
O + rbo[pe], (int) (rbs[pe]),
FFTW_MPI_TYPE,
pe, (pe * n_pes + my_pe) & 0x7fff,
- comm, &status);
+ comm, MPI_STATUS_IGNORE);
}
}
@@ -92,7 +91,7 @@ static void transpose_chunks(int *sched,
O + rbo[pe], (int) (rbs[pe]),
FFTW_MPI_TYPE,
pe, (pe * n_pes + my_pe) & 0x7fff,
- comm, &status);
+ comm, MPI_STATUS_IGNORE);
}
}
}
--- mpi/transpose-pairwise-transposed.c 1970-01-01 01:00:00.000000000 +0100
+++ mpi/transpose-pairwise-transposed.c 2015-09-05 06:00:07.280481042 +0200
@@ -0,0 +1,510 @@
+/*
+ * Copyright (c) 2003, 2007-11 Matteo Frigo
+ * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
+ * Copyright (c) 2012 Michael Pippig
+ *
+ * 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
+ *
+ */
+
+/* Distributed transposes using a sequence of carefully scheduled
+ pairwise exchanges. This has the advantage that it can be done
+ in-place, or out-of-place while preserving the input, using buffer
+ space proportional to the local size divided by the number of
+ processes (i.e. to the total array size divided by the number of
+ processes squared). */
+
+#include "mpi-transpose.h"
+#include <string.h>
+
+typedef struct {
+ solver super;
+ int preserve_input; /* preserve input even if DESTROY_INPUT was passed */
+} S;
+
+typedef struct {
+ plan_mpi_transpose super;
+
+ plan *cld1, *cld2, *cld2rest, *cld3;
+ INT rest_Ioff, rest_Ooff;
+
+ int n_pes, my_pe, *sched;
+ INT *send_block_sizes, *send_block_offsets;
+ INT *recv_block_sizes, *recv_block_offsets;
+ MPI_Comm comm;
+ int preserve_input;
+} P;
+
+static void transpose_chunks(int *sched, int n_pes, int my_pe,
+ INT *sbs, INT *sbo, INT *rbs, INT *rbo,
+ MPI_Comm comm,
+ R *I, R *O)
+{
+ if (sched) {
+ int i;
+
+ /* TODO: explore non-synchronous send/recv? */
+
+ if (I == O) {
+ R *buf = (R*) MALLOC(sizeof(R) * sbs[0], BUFFERS);
+
+ for (i = 0; i < n_pes; ++i) {
+ int pe = sched[i];
+ if (my_pe == pe) {
+ if (rbo[pe] != sbo[pe])
+ memmove(O + rbo[pe], O + sbo[pe],
+ sbs[pe] * sizeof(R));
+ }
+ else {
+ memcpy(buf, O + sbo[pe], sbs[pe] * sizeof(R));
+ MPI_Sendrecv(buf, (int) (sbs[pe]), FFTW_MPI_TYPE,
+ pe, (my_pe * n_pes + pe) & 0x7fff,
+ O + rbo[pe], (int) (rbs[pe]),
+ FFTW_MPI_TYPE,
+ pe, (pe * n_pes + my_pe) & 0x7fff,
+ comm, MPI_STATUS_IGNORE);
+ }
+ }
+
+ X(ifree)(buf);
+ }
+ else { /* I != O */
+ for (i = 0; i < n_pes; ++i) {
+ int pe = sched[i];
+ if (my_pe == pe)
+ memcpy(O + rbo[pe], I + sbo[pe], sbs[pe] * sizeof(R));
+ else
+ MPI_Sendrecv(I + sbo[pe], (int) (sbs[pe]),
+ FFTW_MPI_TYPE,
+ pe, (my_pe * n_pes + pe) & 0x7fff,
+ O + rbo[pe], (int) (rbs[pe]),
+ FFTW_MPI_TYPE,
+ pe, (pe * n_pes + my_pe) & 0x7fff,
+ comm, MPI_STATUS_IGNORE);
+ }
+ }
+ }
+}
+
+/* transpose locally to get contiguous chunks
+ this may take two transposes if the block sizes are unequal
+ (3 subplans, two of which operate on disjoint data) */
+static void apply_pretranspose(
+ const P *ego, R *I, R *O
+ )
+{
+ plan_rdft *cld2, *cld2rest, *cld3;
+
+ cld3 = (plan_rdft *) ego->cld3;
+ if (cld3)
+ cld3->apply(ego->cld3, O, O);
+ /* else TRANSPOSED_IN is true and user wants I transposed */
+
+ cld2 = (plan_rdft *) ego->cld2;
+ cld2->apply(ego->cld2, I, O);
+ cld2rest = (plan_rdft *) ego->cld2rest;
+ if (cld2rest) {
+ cld2rest->apply(ego->cld2rest,
+ I + ego->rest_Ioff, O + ego->rest_Ooff);
+ }
+}
+
+static void apply(const plan *ego_, R *I, R *O)
+{
+ const P *ego = (const P *) ego_;
+ plan_rdft *cld1 = (plan_rdft *) ego->cld1;
+
+ if (cld1) {
+ /* transpose locally to get contiguous chunks */
+ apply_pretranspose(ego, I, O);
+
+ if(ego->preserve_input) I = O;
+
+ /* transpose chunks globally */
+ transpose_chunks(ego->sched, ego->n_pes, ego->my_pe,
+ ego->send_block_sizes, ego->send_block_offsets,
+ ego->recv_block_sizes, ego->recv_block_offsets,
+ ego->comm, O, I);
+
+ /* transpose locally to get non-transposed output */
+ cld1->apply(ego->cld1, I, O);
+ } /* else TRANSPOSED_OUT is true and user wants O transposed */
+ else if (ego->preserve_input) {
+ /* transpose locally to get contiguous chunks */
+ apply_pretranspose(ego, I, O);
+
+ /* transpose chunks globally */
+ transpose_chunks(ego->sched, ego->n_pes, ego->my_pe,
+ ego->send_block_sizes, ego->send_block_offsets,
+ ego->recv_block_sizes, ego->recv_block_offsets,
+ ego->comm, O, O);
+ }
+ else {
+ /* transpose locally to get contiguous chunks */
+ apply_pretranspose(ego, I, I);
+
+ /* transpose chunks globally */
+ transpose_chunks(ego->sched, ego->n_pes, ego->my_pe,
+ ego->send_block_sizes, ego->send_block_offsets,
+ ego->recv_block_sizes, ego->recv_block_offsets,
+ ego->comm, I, O);
+ }
+}
+
+static int applicable(const S *ego, const problem *p_,
+ const planner *plnr)
+{
+ const problem_mpi_transpose *p = (const problem_mpi_transpose *) p_;
+ /* Note: this is *not* UGLY for out-of-place, destroy-input plans;
+ the planner often prefers transpose-pairwise to transpose-alltoall,
+ at least with LAM MPI on my machine. */
+ return (1
+ && (!ego->preserve_input || (!NO_DESTROY_INPUTP(plnr)
+ && p->I != p->O))
+ && ONLY_TRANSPOSEDP(p->flags));
+}
+
+static void awake(plan *ego_, enum wakefulness wakefulness)
+{
+ P *ego = (P *) ego_;
+ X(plan_awake)(ego->cld1, wakefulness);
+ X(plan_awake)(ego->cld2, wakefulness);
+ X(plan_awake)(ego->cld2rest, wakefulness);
+ X(plan_awake)(ego->cld3, wakefulness);
+}
+
+static void destroy(plan *ego_)
+{
+ P *ego = (P *) ego_;
+ X(ifree0)(ego->sched);
+ X(ifree0)(ego->send_block_sizes);
+ MPI_Comm_free(&ego->comm);
+ X(plan_destroy_internal)(ego->cld3);
+ X(plan_destroy_internal)(ego->cld2rest);
+ X(plan_destroy_internal)(ego->cld2);
+ X(plan_destroy_internal)(ego->cld1);
+}
+
+static void print(const plan *ego_, printer *p)
+{
+ const P *ego = (const P *) ego_;
+ p->print(p, "(mpi-transpose-pairwise-transposed%s%(%p%)%(%p%)%(%p%)%(%p%))",
+ ego->preserve_input==2 ?"/p":"",
+ ego->cld1, ego->cld2, ego->cld2rest, ego->cld3);
+}
+
+/* Given a process which_pe and a number of processes npes, fills
+ the array sched[npes] with a sequence of processes to communicate
+ with for a deadlock-free, optimum-overlap all-to-all communication.
+ (All processes must call this routine to get their own schedules.)
+ The schedule can be re-ordered arbitrarily as long as all processes
+ apply the same permutation to their schedules.
+
+ The algorithm here is based upon the one described in:
+ J. A. M. Schreuder, "Constructing timetables for sport
+ competitions," Mathematical Programming Study 13, pp. 58-67 (1980).
+ In a sport competition, you have N teams and want every team to
+ play every other team in as short a time as possible (maximum overlap
+ between games). This timetabling problem is therefore identical
+ to that of an all-to-all communications problem. In our case, there
+ is one wrinkle: as part of the schedule, the process must do
+ some data transfer with itself (local data movement), analogous
+ to a requirement that each team "play itself" in addition to other
+ teams. With this wrinkle, it turns out that an optimal timetable
+ (N parallel games) can be constructed for any N, not just for even
+ N as in the original problem described by Schreuder.
+*/
+static void fill1_comm_sched(int *sched, int which_pe, int npes)
+{
+ int pe, i, n, s = 0;
+ A(which_pe >= 0 && which_pe < npes);
+ if (npes % 2 == 0) {
+ n = npes;
+ sched[s++] = which_pe;
+ }
+ else
+ n = npes + 1;
+ for (pe = 0; pe < n - 1; ++pe) {
+ if (npes % 2 == 0) {
+ if (pe == which_pe) sched[s++] = npes - 1;
+ else if (npes - 1 == which_pe) sched[s++] = pe;
+ }
+ else if (pe == which_pe) sched[s++] = pe;
+
+ if (pe != which_pe && which_pe < n - 1) {
+ i = (pe - which_pe + (n - 1)) % (n - 1);
+ if (i < n/2)
+ sched[s++] = (pe + i) % (n - 1);
+
+ i = (which_pe - pe + (n - 1)) % (n - 1);
+ if (i < n/2)
+ sched[s++] = (pe - i + (n - 1)) % (n - 1);
+ }
+ }
+ A(s == npes);
+}
+
+/* Sort the communication schedule sched for npes so that the schedule
+ on process sortpe is ascending or descending (!ascending). This is
+ necessary to allow in-place transposes when the problem does not
+ divide equally among the processes. In this case there is one
+ process where the incoming blocks are bigger/smaller than the
+ outgoing blocks and thus have to be received in
+ descending/ascending order, respectively, to avoid overwriting data
+ before it is sent. */
+static void sort1_comm_sched(int *sched, int npes, int sortpe, int ascending)
+{
+ int *sortsched, i;
+ sortsched = (int *) MALLOC(npes * sizeof(int) * 2, OTHER);
+ fill1_comm_sched(sortsched, sortpe, npes);
+ if (ascending)
+ for (i = 0; i < npes; ++i)
+ sortsched[npes + sortsched[i]] = sched[i];
+ else
+ for (i = 0; i < npes; ++i)
+ sortsched[2*npes - 1 - sortsched[i]] = sched[i];
+ for (i = 0; i < npes; ++i)
+ sched[i] = sortsched[npes + i];
+ X(ifree)(sortsched);
+}
+
+/* make the plans to do the pre-MPI transpositions (shared with
+ transpose-alltoall-transposed) */
+int XM(mkplans_pretranspose)(const problem_mpi_transpose *p, planner *plnr,
+ R *I, R *O, int my_pe,
+ plan **cld2, plan **cld2rest, plan **cld3,
+ INT *rest_Ioff, INT *rest_Ooff)
+{
+ INT vn = p->vn;
+ INT b = XM(block)(p->nx, p->block, my_pe);
+ INT bt = p->tblock;
+ INT nyb = p->ny / bt; /* number of equal-sized blocks */
+ INT nyr = p->ny - nyb * bt; /* leftover rows after equal blocks */
+
+ *cld2 = *cld2rest = *cld3 = NULL;
+ *rest_Ioff = *rest_Ooff = 0;
+
+ if (!(p->flags & TRANSPOSED_IN) && (nyr == 0 || I != O)) {
+ INT ny = p->ny * vn;
+ bt *= vn;
+ *cld2 = X(mkplan_f_d)(plnr,
+ X(mkproblem_rdft_0_d)(X(mktensor_3d)
+ (nyb, bt, b * bt,
+ b, ny, bt,
+ bt, 1, 1),
+ I, O),
+ 0, 0, NO_SLOW);
+ if (!*cld2) goto nada;
+
+ if (nyr > 0) {
+ *rest_Ioff = nyb * bt;
+ *rest_Ooff = nyb * b * bt;
+ bt = nyr * vn;
+ *cld2rest = X(mkplan_f_d)(plnr,
+ X(mkproblem_rdft_0_d)(X(mktensor_2d)
+ (b, ny, bt,
+ bt, 1, 1),
+ I + *rest_Ioff,
+ O + *rest_Ooff),
+ 0, 0, NO_SLOW);
+ if (!*cld2rest) goto nada;
+ }
+ }
+ else {
+ *cld2 = X(mkplan_f_d)(plnr,
+ X(mkproblem_rdft_0_d)(
+ X(mktensor_4d)
+ (nyb, b * bt * vn, b * bt * vn,
+ b, vn, bt * vn,
+ bt, b * vn, vn,
+ vn, 1, 1),
+ I, O),
+ 0, 0, NO_SLOW);
+ if (!*cld2) goto nada;
+
+ *rest_Ioff = *rest_Ooff = nyb * bt * b * vn;
+ *cld2rest = X(mkplan_f_d)(plnr,
+ X(mkproblem_rdft_0_d)(
+ X(mktensor_3d)
+ (b, vn, nyr * vn,
+ nyr, b * vn, vn,
+ vn, 1, 1),
+ I + *rest_Ioff, O + *rest_Ooff),
+ 0, 0, NO_SLOW);
+ if (!*cld2rest) goto nada;
+
+ if (!(p->flags & TRANSPOSED_IN)) {
+ *cld3 = X(mkplan_f_d)(plnr,
+ X(mkproblem_rdft_0_d)(
+ X(mktensor_3d)
+ (p->ny, vn, b * vn,
+ b, p->ny * vn, vn,
+ vn, 1, 1),
+ I, I),
+ 0, 0, NO_SLOW);
+ if (!*cld3) goto nada;
+ }
+ }
+
+ return 1;
+
+nada:
+ X(plan_destroy_internal)(*cld3);
+ X(plan_destroy_internal)(*cld2rest);
+ X(plan_destroy_internal)(*cld2);
+ *cld2 = *cld2rest = *cld3 = NULL;
+ return 0;
+}
+
+static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
+{
+ const S *ego = (const S *) ego_;
+ const problem_mpi_transpose *p;
+ P *pln;
+ plan *cld1 = 0, *cld2 = 0, *cld2rest = 0, *cld3 = 0;
+ INT b, bt, vn, rest_Ioff, rest_Ooff;
+ INT *sbs, *sbo, *rbs, *rbo;
+ int pe, my_pe, n_pes, sort_pe = -1, ascending = 1;
+ R *I, *O;
+ static const plan_adt padt = {
+ XM(transpose_solve), awake, print, destroy
+ };
+
+ UNUSED(ego);
+
+ if (!applicable(ego, p_, plnr))
+ return (plan *) 0;
+
+ p = (const problem_mpi_transpose *) p_;
+ vn = p->vn;
+ I = p->I; O = p->O;
+
+ MPI_Comm_rank(p->comm, &my_pe);
+ MPI_Comm_size(p->comm, &n_pes);
+
+ bt = XM(block)(p->ny, p->tblock, my_pe);
+
+
+ if (ego->preserve_input || NO_DESTROY_INPUTP(plnr)) I = p->O;
+
+ if (!(p->flags & TRANSPOSED_OUT)) { /* nx x bt x vn -> bt x nx x vn */
+ cld1 = X(mkplan_f_d)(plnr,
+ X(mkproblem_rdft_0_d)(X(mktensor_3d)
+ (bt, vn, p->nx * vn,
+ p->nx, bt * vn, vn,
+ vn, 1, 1),
+ I, O = p->O),
+ 0, 0, NO_SLOW);
+ if (XM(any_true)(!cld1, p->comm)) goto nada;
+
+ }
+ else {
+ if (ego->preserve_input || NO_DESTROY_INPUTP(plnr))
+ O = p->O;
+ else
+ O = p->I;
+ }
+
+ if (XM(any_true)(!XM(mkplans_pretranspose)(p, plnr, p->I, O, my_pe,
+ &cld2, &cld2rest, &cld3,
+ &rest_Ioff, &rest_Ooff),
+ p->comm)) goto nada;
+
+ pln = MKPLAN_MPI_TRANSPOSE(P, &padt, apply);
+
+ pln->cld1 = cld1;
+ pln->cld2 = cld2;
+ pln->cld2rest = cld2rest;
+ pln->rest_Ioff = rest_Ioff;
+ pln->rest_Ooff = rest_Ooff;
+ pln->cld3 = cld3;
+ pln->preserve_input = ego->preserve_input ? 2 : NO_DESTROY_INPUTP(plnr);
+
+ MPI_Comm_dup(p->comm, &pln->comm);
+
+ n_pes = (int) X(imax)(XM(num_blocks)(p->nx, p->block),
+ XM(num_blocks)(p->ny, p->tblock));
+
+ /* Compute sizes/offsets of blocks to exchange between processors */
+ sbs = (INT *) MALLOC(4 * n_pes * sizeof(INT), PLANS);
+ sbo = sbs + n_pes;
+ rbs = sbo + n_pes;
+ rbo = rbs + n_pes;
+ b = XM(block)(p->nx, p->block, my_pe);
+ bt = XM(block)(p->ny, p->tblock, my_pe);
+ for (pe = 0; pe < n_pes; ++pe) {
+ INT db, dbt; /* destination block sizes */
+ db = XM(block)(p->nx, p->block, pe);
+ dbt = XM(block)(p->ny, p->tblock, pe);
+
+ sbs[pe] = b * dbt * vn;
+ sbo[pe] = pe * (b * p->tblock) * vn;
+ rbs[pe] = db * bt * vn;
+ rbo[pe] = pe * (p->block * bt) * vn;
+
+ if (db * dbt > 0 && db * p->tblock != p->block * dbt) {
+ A(sort_pe == -1); /* only one process should need sorting */
+ sort_pe = pe;
+ ascending = db * p->tblock > p->block * dbt;
+ }
+ }
+ pln->n_pes = n_pes;
+ pln->my_pe = my_pe;
+ pln->send_block_sizes = sbs;
+ pln->send_block_offsets = sbo;
+ pln->recv_block_sizes = rbs;
+ pln->recv_block_offsets = rbo;
+
+ if (my_pe >= n_pes) {
+ pln->sched = 0; /* this process is not doing anything */
+ }
+ else {
+ pln->sched = (int *) MALLOC(n_pes * sizeof(int), PLANS);
+ fill1_comm_sched(pln->sched, my_pe, n_pes);
+ if (sort_pe >= 0)
+ sort1_comm_sched(pln->sched, n_pes, sort_pe, ascending);
+ }
+
+ X(ops_zero)(&pln->super.super.ops);
+ if (cld1) X(ops_add2)(&cld1->ops, &pln->super.super.ops);
+ if (cld2) X(ops_add2)(&cld2->ops, &pln->super.super.ops);
+ if (cld2rest) X(ops_add2)(&cld2rest->ops, &pln->super.super.ops);
+ if (cld3) X(ops_add2)(&cld3->ops, &pln->super.super.ops);
+ /* FIXME: should MPI operations be counted in "other" somehow? */
+
+ return &(pln->super.super);
+
+ nada:
+ X(plan_destroy_internal)(cld3);
+ X(plan_destroy_internal)(cld2rest);
+ X(plan_destroy_internal)(cld2);
+ X(plan_destroy_internal)(cld1);
+ return (plan *) 0;
+}
+
+static solver *mksolver(int preserve_input)
+{
+ static const solver_adt sadt = { PROBLEM_MPI_TRANSPOSE, mkplan, 0 };
+ S *slv = MKSOLVER(S, &sadt);
+ slv->preserve_input = preserve_input;
+ return &(slv->super);
+}
+
+void XM(transpose_pairwise_transposed_register)(planner *p)
+{
+ int preserve_input;
+ for (preserve_input = 0; preserve_input <= 1; ++preserve_input)
+ REGISTER_SOLVER(p, mksolver(preserve_input));
+}