Actual source code: vpscat.h
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)
41: if ((xin->map->n > 10000) && (sstarts[nsends]*bs < 0.05*xin->map->n) && (xin->valid_GPU_array == PETSC_CUSP_GPU) && !(to->local.n)) {
42: if (!ctx->spptr) {
43: PetscInt k,*tindices,n = sstarts[nsends],*sindices;
44: PetscMalloc(n*sizeof(PetscInt),&tindices);
45: PetscMemcpy(tindices,to->indices,n*sizeof(PetscInt));
46: PetscSortRemoveDupsInt(&n,tindices);
47: PetscMalloc(bs*n*sizeof(PetscInt),&sindices);
48: for (i=0; i<n; i++) {
49: for (k=0; k<bs; k++) {
50: sindices[i*bs+k] = tindices[i]+k;
51: }
52: }
53: PetscFree(tindices);
54: PetscCUSPIndicesCreate(n*bs,sindices,(PetscCUSPIndices*)&ctx->spptr);
55: PetscFree(sindices);
56: }
57: VecCUSPCopyFromGPUSome_Public(xin,(PetscCUSPIndices)ctx->spptr);
58: xv = *(PetscScalar**)xin->data;
59: } else {
60: VecGetArrayRead(xin,(const PetscScalar**)&xv);
61: }
62: #else
63: VecGetArrayRead(xin,(const PetscScalar**)&xv);
64: #endif
65: if (xin != yin) {VecGetArray(yin,&yv);} else {yv = xv;}
67: if (!(mode & SCATTER_LOCAL)) {
69: if (!from->use_readyreceiver && !to->sendfirst && !to->use_alltoallv & !to->use_window) {
70: /* post receives since they were not previously posted */
71: if (nrecvs) {MPI_Startall_irecv(from->starts[nrecvs]*bs,nrecvs,rwaits);}
72: }
74: #if defined(PETSC_HAVE_MPI_ALLTOALLW) && !defined(PETSC_USE_64BIT_INDICES)
75: if (to->use_alltoallw && addv == INSERT_VALUES) {
76: MPI_Alltoallw(xv,to->wcounts,to->wdispls,to->types,yv,from->wcounts,from->wdispls,from->types,((PetscObject)ctx)->comm);
77: } else
78: #endif
79: if (ctx->packtogether || to->use_alltoallv || to->use_window) {
80: /* this version packs all the messages together and sends, when -vecscatter_packtogether used */
81: PETSCMAP1(Pack)(sstarts[nsends],indices,xv,svalues);
82: if (to->use_alltoallv) {
83: MPI_Alltoallv(to->values,to->counts,to->displs,MPIU_SCALAR,from->values,from->counts,from->displs,MPIU_SCALAR,((PetscObject)ctx)->comm);
84: #if defined(PETSC_HAVE_MPI_WIN_CREATE)
85: } else if (to->use_window) {
86: PetscInt cnt;
88: MPI_Win_fence(0,from->window);
89: for (i=0; i<nsends; i++) {
90: cnt = bs*(to->starts[i+1]-to->starts[i]);
91: MPI_Put(to->values+bs*to->starts[i],cnt,MPIU_SCALAR,to->procs[i],bs*to->winstarts[i],cnt,MPIU_SCALAR,from->window);
92: }
93: #endif
94: } else if (nsends) {
95: MPI_Startall_isend(to->starts[to->n],nsends,swaits);
96: }
97: } else {
98: /* this version packs and sends one at a time */
99: for (i=0; i<nsends; i++) {
100: PETSCMAP1(Pack)(sstarts[i+1]-sstarts[i],indices + sstarts[i],xv,svalues + bs*sstarts[i]);
101: MPI_Start_isend(sstarts[i+1]-sstarts[i],swaits+i);
102: }
103: }
105: if (!from->use_readyreceiver && to->sendfirst && !to->use_alltoallv && !to->use_window) {
106: /* post receives since they were not previously posted */
107: if (nrecvs) {MPI_Startall_irecv(from->starts[nrecvs]*bs,nrecvs,rwaits);}
108: }
109: }
111: /* take care of local scatters */
112: if (to->local.n) {
113: if (to->local.is_copy && addv == INSERT_VALUES) {
114: PetscMemcpy(yv + from->local.copy_start,xv + to->local.copy_start,to->local.copy_length);
115: } else {
116: PETSCMAP1(Scatter)(to->local.n,to->local.vslots,xv,from->local.vslots,yv,addv);
117: }
118: }
119: #if defined(PETSC_HAVE_CUSP)
120: if (xin->valid_GPU_array != PETSC_CUSP_GPU) {
121: VecRestoreArrayRead(xin,(const PetscScalar**)&xv);
122: } else {
123: VecRestoreArrayRead(xin,(const PetscScalar**)&xv);
124: }
125: #else
126: VecRestoreArrayRead(xin,(const PetscScalar**)&xv);
127: #endif
128: if (xin != yin) {VecRestoreArray(yin,&yv);}
129: return(0);
130: }
132: /* --------------------------------------------------------------------------------------*/
136: PetscErrorCode PETSCMAP1(VecScatterEnd)(VecScatter ctx,Vec xin,Vec yin,InsertMode addv,ScatterMode mode)
137: {
138: VecScatter_MPI_General *to,*from;
139: PetscScalar *rvalues,*yv;
140: PetscErrorCode ierr;
141: PetscInt nrecvs,nsends,*indices,count,*rstarts,bs;
142: PetscMPIInt imdex;
143: MPI_Request *rwaits,*swaits;
144: MPI_Status xrstatus,*rstatus,*sstatus;
147: if (mode & SCATTER_LOCAL) return(0);
148: VecGetArray(yin,&yv);
150: to = (VecScatter_MPI_General*)ctx->todata;
151: from = (VecScatter_MPI_General*)ctx->fromdata;
152: rwaits = from->requests;
153: swaits = to->requests;
154: sstatus = to->sstatus; /* sstatus and rstatus are always stored in to */
155: rstatus = to->rstatus;
156: if (mode & SCATTER_REVERSE) {
157: to = (VecScatter_MPI_General*)ctx->fromdata;
158: from = (VecScatter_MPI_General*)ctx->todata;
159: rwaits = from->rev_requests;
160: swaits = to->rev_requests;
161: }
162: bs = from->bs;
163: rvalues = from->values;
164: nrecvs = from->n;
165: nsends = to->n;
166: indices = from->indices;
167: rstarts = from->starts;
169: if (ctx->packtogether || (to->use_alltoallw && (addv != INSERT_VALUES)) || (to->use_alltoallv && !to->use_alltoallw) || to->use_window) {
170: #if defined(PETSC_HAVE_MPI_WIN_CREATE)
171: if (to->use_window) {MPI_Win_fence(0,from->window);}
172: else
173: #endif
174: if (nrecvs && !to->use_alltoallv) {MPI_Waitall(nrecvs,rwaits,rstatus);}
175: PETSCMAP1(UnPack)(from->starts[from->n],from->values,indices,yv,addv);
176: } else if (!to->use_alltoallw) {
177: /* unpack one at a time */
178: count = nrecvs;
179: while (count) {
180: if (ctx->reproduce) {
181: imdex = count - 1;
182: MPI_Wait(rwaits+imdex,&xrstatus);
183: } else {
184: MPI_Waitany(nrecvs,rwaits,&imdex,&xrstatus);
185: }
186: /* unpack receives into our local space */
187: PETSCMAP1(UnPack)(rstarts[imdex+1] - rstarts[imdex],rvalues + bs*rstarts[imdex],indices + rstarts[imdex],yv,addv);
188: count--;
189: }
190: }
191: if (from->use_readyreceiver) {
192: if (nrecvs) {MPI_Startall_irecv(from->starts[nrecvs]*bs,nrecvs,rwaits);}
193: MPI_Barrier(((PetscObject)ctx)->comm);
194: }
196: /* wait on sends */
197: if (nsends && !to->use_alltoallv && !to->use_window) {MPI_Waitall(nsends,swaits,sstatus);}
198: VecRestoreArray(yin,&yv);
199: return(0);
200: }
202: #undef PETSCMAP1_a
203: #undef PETSCMAP1_b
204: #undef PETSCMAP1
205: #undef BS