Actual source code: vpscat.h
petsc-3.5.4 2015-05-23
2: /*
3: Defines the methods VecScatterBegin/End_1,2,......
4: This is included by vpscat.c with different values for BS
6: This is a terrible way of doing "templates" in C.
7: */
8: #define PETSCMAP1_a(a,b) a ## _ ## b
9: #define PETSCMAP1_b(a,b) PETSCMAP1_a(a,b)
10: #define PETSCMAP1(a) PETSCMAP1_b(a,BS)
14: PetscErrorCode PETSCMAP1(VecScatterBegin)(VecScatter ctx,Vec xin,Vec yin,InsertMode addv,ScatterMode mode)
15: {
16: VecScatter_MPI_General *to,*from;
17: PetscScalar *xv,*yv,*svalues;
18: MPI_Request *rwaits,*swaits;
19: PetscErrorCode ierr;
20: PetscInt i,*indices,*sstarts,nrecvs,nsends,bs;
23: if (mode & SCATTER_REVERSE) {
24: to = (VecScatter_MPI_General*)ctx->fromdata;
25: from = (VecScatter_MPI_General*)ctx->todata;
26: rwaits = from->rev_requests;
27: swaits = to->rev_requests;
28: } else {
29: to = (VecScatter_MPI_General*)ctx->todata;
30: from = (VecScatter_MPI_General*)ctx->fromdata;
31: rwaits = from->requests;
32: swaits = to->requests;
33: }
34: bs = to->bs;
35: svalues = to->values;
36: nrecvs = from->n;
37: nsends = to->n;
38: indices = to->indices;
39: sstarts = to->starts;
40: #if defined(PETSC_HAVE_CUSP)
42: if (xin->valid_GPU_array == PETSC_CUSP_GPU) {
43: if (xin->spptr && ctx->spptr) {
44: VecCUSPCopyFromGPUSome_Public(xin,(PetscCUSPIndices)ctx->spptr);
45: }
46: }
47: xv = *(PetscScalar**)xin->data;
49: #if 0
50: if (!xin->map->n || ((xin->map->n > 10000) && (sstarts[nsends]*bs < 0.05*xin->map->n) && (xin->valid_GPU_array == PETSC_CUSP_GPU) && !(to->local.n))) {
51: if (!ctx->spptr) {
52: PetscInt k,*tindices,n = sstarts[nsends],*sindices;
53: PetscMalloc1(n,&tindices);
54: PetscMemcpy(tindices,to->indices,n*sizeof(PetscInt));
55: PetscSortRemoveDupsInt(&n,tindices);
56: PetscMalloc1(bs*n,&sindices);
57: for (i=0; i<n; i++) {
58: for (k=0; k<bs; k++) sindices[i*bs+k] = tindices[i]+k;
59: }
60: PetscFree(tindices);
61: VecScatterCUSPIndicesCreate_PtoP(n*bs,sindices,n*bs,sindices,(PetscCUSPIndices*)&ctx->spptr);
62: PetscFree(sindices);
63: }
64: VecCUSPCopyFromGPUSome_Public(xin,(PetscCUSPIndices)ctx->spptr);
65: xv = *(PetscScalar**)xin->data;
66: } else {
67: VecGetArrayRead(xin,(const PetscScalar**)&xv);
68: }
69: #endif
71: #else
72: VecGetArrayRead(xin,(const PetscScalar**)&xv);
73: #endif
75: if (xin != yin) {VecGetArray(yin,&yv);}
76: else yv = xv;
78: if (!(mode & SCATTER_LOCAL)) {
79: if (!from->use_readyreceiver && !to->sendfirst && !to->use_alltoallv & !to->use_window) {
80: /* post receives since they were not previously posted */
81: if (nrecvs) {MPI_Startall_irecv(from->starts[nrecvs]*bs,nrecvs,rwaits);}
82: }
84: #if defined(PETSC_HAVE_MPI_ALLTOALLW) && !defined(PETSC_USE_64BIT_INDICES)
85: if (to->use_alltoallw && addv == INSERT_VALUES) {
86: MPI_Alltoallw(xv,to->wcounts,to->wdispls,to->types,yv,from->wcounts,from->wdispls,from->types,PetscObjectComm((PetscObject)ctx));
87: } else
88: #endif
89: if (ctx->packtogether || to->use_alltoallv || to->use_window) {
90: /* this version packs all the messages together and sends, when -vecscatter_packtogether used */
91: PETSCMAP1(Pack)(sstarts[nsends],indices,xv,svalues,bs);
92: if (to->use_alltoallv) {
93: MPI_Alltoallv(to->values,to->counts,to->displs,MPIU_SCALAR,from->values,from->counts,from->displs,MPIU_SCALAR,PetscObjectComm((PetscObject)ctx));
94: #if defined(PETSC_HAVE_MPI_WIN_CREATE)
95: } else if (to->use_window) {
96: PetscInt cnt;
98: MPI_Win_fence(0,from->window);
99: for (i=0; i<nsends; i++) {
100: cnt = bs*(to->starts[i+1]-to->starts[i]);
101: MPI_Put(to->values+bs*to->starts[i],cnt,MPIU_SCALAR,to->procs[i],bs*to->winstarts[i],cnt,MPIU_SCALAR,from->window);
102: }
103: #endif
104: } else if (nsends) {
105: MPI_Startall_isend(to->starts[to->n],nsends,swaits);
106: }
107: } else {
108: /* this version packs and sends one at a time */
109: for (i=0; i<nsends; i++) {
110: PETSCMAP1(Pack)(sstarts[i+1]-sstarts[i],indices + sstarts[i],xv,svalues + bs*sstarts[i],bs);
111: MPI_Start_isend(sstarts[i+1]-sstarts[i],swaits+i);
112: }
113: }
115: if (!from->use_readyreceiver && to->sendfirst && !to->use_alltoallv && !to->use_window) {
116: /* post receives since they were not previously posted */
117: if (nrecvs) {MPI_Startall_irecv(from->starts[nrecvs]*bs,nrecvs,rwaits);}
118: }
119: }
121: /* take care of local scatters */
122: if (to->local.n) {
123: if (to->local.is_copy && addv == INSERT_VALUES) {
124: PetscMemcpy(yv + from->local.copy_start,xv + to->local.copy_start,to->local.copy_length);
125: } else {
126: PETSCMAP1(Scatter)(to->local.n,to->local.vslots,xv,from->local.vslots,yv,addv,bs);
127: }
128: }
129: #if defined(PETSC_HAVE_CUSP)
130: if (xin->valid_GPU_array != PETSC_CUSP_GPU) {
131: VecRestoreArrayRead(xin,(const PetscScalar**)&xv);
132: } else {
133: VecRestoreArrayRead(xin,(const PetscScalar**)&xv);
134: }
135: #else
136: VecRestoreArrayRead(xin,(const PetscScalar**)&xv);
137: #endif
138: if (xin != yin) {VecRestoreArray(yin,&yv);}
139: return(0);
140: }
142: /* --------------------------------------------------------------------------------------*/
146: PetscErrorCode PETSCMAP1(VecScatterEnd)(VecScatter ctx,Vec xin,Vec yin,InsertMode addv,ScatterMode mode)
147: {
148: VecScatter_MPI_General *to,*from;
149: PetscScalar *rvalues,*yv;
150: PetscErrorCode ierr;
151: PetscInt nrecvs,nsends,*indices,count,*rstarts,bs;
152: PetscMPIInt imdex;
153: MPI_Request *rwaits,*swaits;
154: MPI_Status xrstatus,*rstatus,*sstatus;
157: if (mode & SCATTER_LOCAL) return(0);
158: VecGetArray(yin,&yv);
160: to = (VecScatter_MPI_General*)ctx->todata;
161: from = (VecScatter_MPI_General*)ctx->fromdata;
162: rwaits = from->requests;
163: swaits = to->requests;
164: sstatus = to->sstatus; /* sstatus and rstatus are always stored in to */
165: rstatus = to->rstatus;
166: if (mode & SCATTER_REVERSE) {
167: to = (VecScatter_MPI_General*)ctx->fromdata;
168: from = (VecScatter_MPI_General*)ctx->todata;
169: rwaits = from->rev_requests;
170: swaits = to->rev_requests;
171: }
172: bs = from->bs;
173: rvalues = from->values;
174: nrecvs = from->n;
175: nsends = to->n;
176: indices = from->indices;
177: rstarts = from->starts;
179: if (ctx->packtogether || (to->use_alltoallw && (addv != INSERT_VALUES)) || (to->use_alltoallv && !to->use_alltoallw) || to->use_window) {
180: #if defined(PETSC_HAVE_MPI_WIN_CREATE)
181: if (to->use_window) {MPI_Win_fence(0,from->window);}
182: else
183: #endif
184: if (nrecvs && !to->use_alltoallv) {MPI_Waitall(nrecvs,rwaits,rstatus);}
185: PETSCMAP1(UnPack)(from->starts[from->n],from->values,indices,yv,addv,bs);
186: } else if (!to->use_alltoallw) {
187: /* unpack one at a time */
188: count = nrecvs;
189: while (count) {
190: if (ctx->reproduce) {
191: imdex = count - 1;
192: MPI_Wait(rwaits+imdex,&xrstatus);
193: } else {
194: MPI_Waitany(nrecvs,rwaits,&imdex,&xrstatus);
195: }
196: /* unpack receives into our local space */
197: PETSCMAP1(UnPack)(rstarts[imdex+1] - rstarts[imdex],rvalues + bs*rstarts[imdex],indices + rstarts[imdex],yv,addv,bs);
198: count--;
199: }
200: }
201: if (from->use_readyreceiver) {
202: if (nrecvs) {MPI_Startall_irecv(from->starts[nrecvs]*bs,nrecvs,rwaits);}
203: MPI_Barrier(PetscObjectComm((PetscObject)ctx));
204: }
206: /* wait on sends */
207: if (nsends && !to->use_alltoallv && !to->use_window) {MPI_Waitall(nsends,swaits,sstatus);}
208: VecRestoreArray(yin,&yv);
209: return(0);
210: }
212: #undef PETSCMAP1_a
213: #undef PETSCMAP1_b
214: #undef PETSCMAP1
215: #undef BS