comparison src/fftw-3.3.3/mpi/dft-rank1-bigvec.c @ 10:37bf6b4a2645

Add FFTW3

+/*
+ * Copyright (c) 2003, 2007-11 Matteo Frigo
+ * Copyright (c) 2003, 2007-11 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
+ *
+ */
+
+/* Complex DFTs of rank == 1 when the vector length vn is >= # processes.
+   In this case, we don't need to use a six-step type algorithm, and can
+   instead transpose the DFT dimension with the vector dimension to 
+   make the DFT local. */
+
+#include "mpi-dft.h"
+#include "mpi-transpose.h"
+#include "dft.h"
+
+typedef struct {
+     solver super;
+     int preserve_input; /* preserve input even if DESTROY_INPUT was passed */
+     rearrangement rearrange;
+} S;
+
+typedef struct {
+     plan_mpi_dft super;
+
+     plan *cldt_before, *cld, *cldt_after;
+     INT roff, ioff;
+     int preserve_input;
+     rearrangement rearrange;
+} P;
+
+static void apply(const plan *ego_, R *I, R *O)
+{
+     const P *ego = (const P *) ego_;
+     plan_dft *cld;
+     plan_rdft *cldt_before, *cldt_after;
+     INT roff = ego->roff, ioff = ego->ioff;
+     
+     /* global transpose */
+     cldt_before = (plan_rdft *) ego->cldt_before;
+     cldt_before->apply(ego->cldt_before, I, O);
+     
+     if (ego->preserve_input) I = O;
+	  
+     /* 1d DFT(s) */
+     cld = (plan_dft *) ego->cld;
+     cld->apply(ego->cld, O+roff, O+ioff, I+roff, I+ioff);
+     
+     /* global transpose */
+     cldt_after = (plan_rdft *) ego->cldt_after;
+     cldt_after->apply(ego->cldt_after, I, O);
+}
+
+static int applicable(const S *ego, const problem *p_,
+		      const planner *plnr)
+{
+     const problem_mpi_dft *p = (const problem_mpi_dft *) p_;
+     int n_pes;
+     MPI_Comm_size(p->comm, &n_pes);
+     return (1
+	     && p->sz->rnk == 1
+	     && !(p->flags & ~RANK1_BIGVEC_ONLY)
+	     && (!ego->preserve_input || (!NO_DESTROY_INPUTP(plnr)
+					  && p->I != p->O))
+	     && (p->vn >= n_pes /* TODO: relax this, using more memory? */
+		 || (p->flags & RANK1_BIGVEC_ONLY))
+
+	     && XM(rearrange_applicable)(ego->rearrange,
+					 p->sz->dims[0], p->vn, n_pes)
+
+	     && (!NO_SLOWP(plnr) /* slow if dft-serial is applicable */
+                 || !XM(dft_serial_applicable)(p))
+	  );
+}
+
+static void awake(plan *ego_, enum wakefulness wakefulness)
+{
+     P *ego = (P *) ego_;
+     X(plan_awake)(ego->cldt_before, wakefulness);
+     X(plan_awake)(ego->cld, wakefulness);
+     X(plan_awake)(ego->cldt_after, wakefulness);
+}
+
+static void destroy(plan *ego_)
+{
+     P *ego = (P *) ego_;
+     X(plan_destroy_internal)(ego->cldt_after);
+     X(plan_destroy_internal)(ego->cld);
+     X(plan_destroy_internal)(ego->cldt_before);
+}
+
+static void print(const plan *ego_, printer *p)
+{
+     const P *ego = (const P *) ego_;
+     const char descrip[][16] = { "contig", "discontig", "square-after",
+				  "square-middle", "square-before" };
+     p->print(p, "(mpi-dft-rank1-bigvec/%s%s %(%p%) %(%p%) %(%p%))",
+	      descrip[ego->rearrange], ego->preserve_input==2 ?"/p":"",
+	      ego->cldt_before, ego->cld, ego->cldt_after);
+}
+
+static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
+{
+     const S *ego = (const S *) ego_;
+     const problem_mpi_dft *p;
+     P *pln;
+     plan *cld = 0, *cldt_before = 0, *cldt_after = 0;
+     R *ri, *ii, *ro, *io, *I, *O;
+     INT yblock, yb, nx, ny, vn;
+     int my_pe, n_pes;
+     static const plan_adt padt = {
+          XM(dft_solve), awake, print, destroy
+     };
+
+     UNUSED(ego);
+
+     if (!applicable(ego, p_, plnr))
+          return (plan *) 0;
+
+     p = (const problem_mpi_dft *) p_;
+
+     MPI_Comm_rank(p->comm, &my_pe);
+     MPI_Comm_size(p->comm, &n_pes);
+     
+     nx = p->sz->dims[0].n;
+     if (!(ny = XM(rearrange_ny)(ego->rearrange, p->sz->dims[0],p->vn,n_pes)))
+	  return (plan *) 0;
+     vn = p->vn / ny;
+     A(ny * vn == p->vn);
+
+     yblock = XM(default_block)(ny, n_pes);
+     cldt_before = X(mkplan_d)(plnr,
+			       XM(mkproblem_transpose)(
+				    nx, ny, vn*2,
+				    I = p->I, O = p->O,
+				    p->sz->dims[0].b[IB], yblock,
+				    p->comm, 0));
+     if (XM(any_true)(!cldt_before, p->comm)) goto nada;	  
+     if (ego->preserve_input || NO_DESTROY_INPUTP(plnr)) { I = O; }
+     
+     X(extract_reim)(p->sign, I, &ri, &ii);
+     X(extract_reim)(p->sign, O, &ro, &io);
+
+     yb = XM(block)(ny, yblock, my_pe);
+     cld = X(mkplan_d)(plnr,
+		       X(mkproblem_dft_d)(X(mktensor_1d)(nx, vn*2, vn*2),
+					  X(mktensor_2d)(yb, vn*2*nx, vn*2*nx,
+							 vn, 2, 2),
+					  ro, io, ri, ii));
+     if (XM(any_true)(!cld, p->comm)) goto nada;	  
+     
+     cldt_after = X(mkplan_d)(plnr,
+			      XM(mkproblem_transpose)(
+				   ny, nx, vn*2,
+				   I, O,
+				   yblock, p->sz->dims[0].b[OB], 
+				   p->comm, 0));
+     if (XM(any_true)(!cldt_after, p->comm)) goto nada;	  
+
+     pln = MKPLAN_MPI_DFT(P, &padt, apply);
+
+     pln->cldt_before = cldt_before;
+     pln->cld = cld;
+     pln->cldt_after = cldt_after;
+     pln->preserve_input = ego->preserve_input ? 2 : NO_DESTROY_INPUTP(plnr);
+     pln->roff = ro - p->O;
+     pln->ioff = io - p->O;
+     pln->rearrange = ego->rearrange;
+
+     X(ops_add)(&cldt_before->ops, &cld->ops, &pln->super.super.ops);
+     X(ops_add2)(&cldt_after->ops, &pln->super.super.ops);
+
+     return &(pln->super.super);
+
+ nada:
+     X(plan_destroy_internal)(cldt_after);
+     X(plan_destroy_internal)(cld);
+     X(plan_destroy_internal)(cldt_before);
+     return (plan *) 0;
+}
+
+static solver *mksolver(rearrangement rearrange, int preserve_input)
+{
+     static const solver_adt sadt = { PROBLEM_MPI_DFT, mkplan, 0 };
+     S *slv = MKSOLVER(S, &sadt);
+     slv->rearrange = rearrange;
+     slv->preserve_input = preserve_input;
+     return &(slv->super);
+}
+
+void XM(dft_rank1_bigvec_register)(planner *p)
+{
+     rearrangement rearrange;
+     int preserve_input;
+     FORALL_REARRANGE(rearrange)
+	  for (preserve_input = 0; preserve_input <= 1; ++preserve_input)
+	       REGISTER_SOLVER(p, mksolver(rearrange, preserve_input));
+}