Actual source code: networkcreate.c

petsc-master 2019-10-13
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  1: #define PETSCDM_DLL
  2:  #include <petsc/private/dmnetworkimpl.h>
  3:  #include <petsc/private/vecimpl.h>

  5: PetscErrorCode  DMSetFromOptions_Network(PetscOptionItems *PetscOptionsObject,DM dm)
  6: {

 11:   PetscOptionsHead(PetscOptionsObject,"DMNetwork Options");
 12:   PetscOptionsTail();
 13:   return(0);
 14: }

 16: /* External function declarations here */
 17: extern PetscErrorCode DMCreateMatrix_Network(DM, Mat*);
 18: extern PetscErrorCode DMDestroy_Network(DM);
 19: extern PetscErrorCode DMView_Network(DM, PetscViewer);
 20: extern PetscErrorCode DMGlobalToLocalBegin_Network(DM, Vec, InsertMode, Vec);
 21: extern PetscErrorCode DMGlobalToLocalEnd_Network(DM, Vec, InsertMode, Vec);
 22: extern PetscErrorCode DMLocalToGlobalBegin_Network(DM, Vec, InsertMode, Vec);
 23: extern PetscErrorCode DMLocalToGlobalEnd_Network(DM, Vec, InsertMode, Vec);
 24: extern PetscErrorCode DMSetUp_Network(DM);
 25: extern PetscErrorCode DMClone_Network(DM, DM*);

 27: static PetscErrorCode VecArrayPrint_private(PetscViewer viewer,PetscInt n,const PetscScalar *xv)
 28: {
 30:   PetscInt       i;

 33:   for (i=0; i<n; i++) {
 34: #if defined(PETSC_USE_COMPLEX)
 35:     if (PetscImaginaryPart(xv[i]) > 0.0) {
 36:       PetscViewerASCIIPrintf(viewer,"    %g + %g i\n",(double)PetscRealPart(xv[i]),(double)PetscImaginaryPart(xv[i]));
 37:     } else if (PetscImaginaryPart(xv[i]) < 0.0) {
 38:       PetscViewerASCIIPrintf(viewer,"    %g - %g i\n",(double)PetscRealPart(xv[i]),-(double)PetscImaginaryPart(xv[i]));
 39:     } else {
 40:       PetscViewerASCIIPrintf(viewer,"    %g\n",(double)PetscRealPart(xv[i]));
 41:     }
 42: #else
 43:     PetscViewerASCIIPrintf(viewer,"    %g\n",(double)xv[i]);
 44: #endif
 45:   }
 46:   return(0);
 47: }

 49: static PetscErrorCode VecView_Network_Seq(DM networkdm,Vec X,PetscViewer viewer)
 50: {
 51:   PetscErrorCode    ierr;
 52:   PetscInt          e,v,Start,End,offset,nvar,id;
 53:   const PetscScalar *xv;

 56:   VecGetArrayRead(X,&xv);

 58:   /* iterate over edges */
 59:   DMNetworkGetEdgeRange(networkdm,&Start,&End);
 60:   for (e=Start; e<End; e++) {
 61:     DMNetworkGetNumVariables(networkdm,e,&nvar);
 62:     if (!nvar) continue;

 64:     DMNetworkGetVariableOffset(networkdm,e,&offset);
 65:     DMNetworkGetGlobalEdgeIndex(networkdm,e,&id);

 67:     PetscViewerASCIIPrintf(viewer,"  Edge %D:\n",id);
 68:     VecArrayPrint_private(viewer,nvar,xv+offset);
 69:   }

 71:   /* iterate over vertices */
 72:   DMNetworkGetVertexRange(networkdm,&Start,&End);
 73:   for (v=Start; v<End; v++) {
 74:     DMNetworkGetNumVariables(networkdm,v,&nvar);
 75:     if (!nvar) continue;

 77:     DMNetworkGetVariableOffset(networkdm,v,&offset);
 78:     DMNetworkGetGlobalVertexIndex(networkdm,v,&id);

 80:     PetscViewerASCIIPrintf(viewer,"  Vertex %D:\n",id);
 81:     VecArrayPrint_private(viewer,nvar,xv+offset);
 82:   }
 83:   PetscViewerFlush(viewer);
 84:   VecRestoreArrayRead(X,&xv);
 85:   return(0);
 86: }

 88: static PetscErrorCode VecView_Network_MPI(DM networkdm,Vec X,PetscViewer viewer)
 89: {
 90:   PetscErrorCode    ierr;
 91:   PetscInt          i,e,v,eStart,eEnd,vStart,vEnd,offset,nvar,len_loc,len,k;
 92:   const PetscScalar *xv;
 93:   MPI_Comm          comm;
 94:   PetscMPIInt       size,rank,tag = ((PetscObject)viewer)->tag;
 95:   Vec               localX;
 96:   PetscBool         ghostvtex;
 97:   PetscScalar       *values;
 98:   PetscInt          j,ne,nv,id;
 99:   MPI_Status        status;

102:   PetscObjectGetComm((PetscObject)networkdm,&comm);
103:   MPI_Comm_size(comm,&size);
104:   MPI_Comm_rank(comm,&rank);

106:   DMGetLocalVector(networkdm,&localX);
107:   DMGlobalToLocalBegin(networkdm,X,INSERT_VALUES,localX);
108:   DMGlobalToLocalEnd(networkdm,X,INSERT_VALUES,localX);
109:   VecGetArrayRead(localX,&xv);

111:   VecGetLocalSize(localX,&len_loc);

113:   DMNetworkGetEdgeRange(networkdm,&eStart,&eEnd);
114:   DMNetworkGetVertexRange(networkdm,&vStart,&vEnd);
115:   len_loc += 2*(1 + eEnd-eStart + vEnd-vStart);

117:   /* values = [nedges, nvertices; id, nvar, xedge; ...; id, nvars, xvertex;...], to be sent to proc[0] */
118:   MPI_Allreduce(&len_loc,&len,1,MPIU_INT,MPI_MAX,comm);
119:   PetscCalloc1(len,&values);

121:   if (!rank) {
122:     PetscViewerASCIIPrintf(viewer,"Process [%d]\n",rank);
123:   }

125:   /* iterate over edges */
126:   k = 2;
127:   for (e=eStart; e<eEnd; e++) {
128:     DMNetworkGetNumVariables(networkdm,e,&nvar);
129:     if (!nvar) continue;

131:     DMNetworkGetVariableOffset(networkdm,e,&offset);
132:     DMNetworkGetGlobalEdgeIndex(networkdm,e,&id);

134:     if (!rank) { /* print its own entries */
135:       PetscViewerASCIIPrintf(viewer,"  Edge %D:\n",id);
136:       VecArrayPrint_private(viewer,nvar,xv+offset);
137:     } else {
138:       values[0]  += 1; /* number of edges */
139:       values[k++] = id;
140:       values[k++] = nvar;
141:       for (i=offset; i< offset+nvar; i++) values[k++] = xv[i];
142:     }
143:   }

145:   /* iterate over vertices */
146:   for (v=vStart; v<vEnd; v++) {
147:     DMNetworkIsGhostVertex(networkdm,v,&ghostvtex);
148:     if (ghostvtex) continue;
149:     DMNetworkGetNumVariables(networkdm,v,&nvar);
150:     if (!nvar) continue;

152:     DMNetworkGetVariableOffset(networkdm,v,&offset);
153:     DMNetworkGetGlobalVertexIndex(networkdm,v,&id);

155:     if (!rank) {
156:       PetscViewerASCIIPrintf(viewer,"  Vertex %D:\n",id);
157:       VecArrayPrint_private(viewer,nvar,xv+offset);
158:     } else {
159:       values[1]  += 1; /* number of vertices */
160:       values[k++] = id;
161:       values[k++] = nvar;
162:       for (i=offset; i< offset+nvar; i++) values[k++] = xv[i];
163:     }
164:   }

166:   if (!rank) {
167:     /* proc[0] receives and prints messages */
168:     for (j=1; j<size; j++) {
169:       PetscViewerASCIIPrintf(viewer,"Process [%d]\n",j);

171:       MPI_Recv(values,(PetscMPIInt)len,MPIU_SCALAR,j,tag,comm,&status);

173:       ne = (PetscInt)PetscAbsScalar(values[0]);
174:       nv = (PetscInt)PetscAbsScalar(values[1]);

176:       /* print received edges */
177:       k = 2;
178:       for (i=0; i<ne; i++) {
179:         id   = (PetscInt)PetscAbsScalar(values[k++]);
180:         nvar = (PetscInt)PetscAbsScalar(values[k++]);
181:         PetscViewerASCIIPrintf(viewer,"  Edge %D:\n",id);
182:         VecArrayPrint_private(viewer,nvar,values+k);
183:         k   += nvar;
184:       }

186:       /* print received vertices */
187:       for (i=0; i<nv; i++) {
188:         id   = (PetscInt)PetscAbsScalar(values[k++]);
189:         nvar = (PetscInt)PetscAbsScalar(values[k++]);
190:         PetscViewerASCIIPrintf(viewer,"  Vertex %D:\n",id);
191:         VecArrayPrint_private(viewer,nvar,values+k);
192:         k   += nvar;
193:       }
194:     }
195:   } else {
196:     /* sends values to proc[0] */
197:     MPI_Send((void*)values,k,MPIU_SCALAR,0,tag,comm);
198:   }

200:   PetscFree(values);
201:   VecRestoreArrayRead(localX,&xv);
202:   DMRestoreLocalVector(networkdm,&localX);
203:   return(0);
204: }

206: PETSC_EXTERN PetscErrorCode VecView_MPI(Vec,PetscViewer);

208: PetscErrorCode VecView_Network(Vec v,PetscViewer viewer)
209: {
210:   DM             dm;
212:   PetscBool      isseq;
213:   PetscBool      iascii;

216:   VecGetDM(v,&dm);
217:   if (!dm) SETERRQ(PetscObjectComm((PetscObject)v),PETSC_ERR_ARG_WRONG,"Vector not generated from a DM");
218:   PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);
219:   PetscObjectTypeCompare((PetscObject)v,VECSEQ,&isseq);

221:   /* Use VecView_Network if the viewer is ASCII; use VecView_Seq/MPI for other viewer formats */
222:   if (iascii) {
223:     if (isseq) {
224:       VecView_Network_Seq(dm,v,viewer);
225:     } else {
226:       VecView_Network_MPI(dm,v,viewer);
227:     }
228:   } else {
229:     if (isseq) {
230:       VecView_Seq(v,viewer);
231:     } else {
232:       VecView_MPI(v,viewer);
233:     }
234:   }
235:   return(0);
236: }

238: static PetscErrorCode DMCreateGlobalVector_Network(DM dm,Vec *vec)
239: {
241:   DM_Network     *network = (DM_Network*) dm->data;

244:   DMCreateGlobalVector(network->plex,vec);
245:   VecSetOperation(*vec, VECOP_VIEW, (void (*)(void)) VecView_Network);
246:   VecSetDM(*vec,dm);
247:   return(0);
248: }

250: static PetscErrorCode DMCreateLocalVector_Network(DM dm,Vec *vec)
251: {
253:   DM_Network     *network = (DM_Network*) dm->data;

256:   DMCreateLocalVector(network->plex,vec);
257:   VecSetDM(*vec,dm);
258:   return(0);
259: }

261: PetscErrorCode DMInitialize_Network(DM dm)
262: {

266:   DMSetDimension(dm,1);
267:   dm->ops->view                            = DMView_Network;
268:   dm->ops->setfromoptions                  = DMSetFromOptions_Network;
269:   dm->ops->clone                           = DMClone_Network;
270:   dm->ops->setup                           = DMSetUp_Network;
271:   dm->ops->createglobalvector              = DMCreateGlobalVector_Network;
272:   dm->ops->createlocalvector               = DMCreateLocalVector_Network;
273:   dm->ops->getlocaltoglobalmapping         = NULL;
274:   dm->ops->createfieldis                   = NULL;
275:   dm->ops->createcoordinatedm              = NULL;
276:   dm->ops->getcoloring                     = 0;
277:   dm->ops->creatematrix                    = DMCreateMatrix_Network;
278:   dm->ops->createinterpolation             = 0;
279:   dm->ops->createinjection                 = 0;
280:   dm->ops->refine                          = 0;
281:   dm->ops->coarsen                         = 0;
282:   dm->ops->refinehierarchy                 = 0;
283:   dm->ops->coarsenhierarchy                = 0;
284:   dm->ops->globaltolocalbegin              = DMGlobalToLocalBegin_Network;
285:   dm->ops->globaltolocalend                = DMGlobalToLocalEnd_Network;
286:   dm->ops->localtoglobalbegin              = DMLocalToGlobalBegin_Network;
287:   dm->ops->localtoglobalend                = DMLocalToGlobalEnd_Network;
288:   dm->ops->destroy                         = DMDestroy_Network;
289:   dm->ops->createsubdm                     = NULL;
290:   dm->ops->locatepoints                    = NULL;
291:   return(0);
292: }

294: PetscErrorCode DMClone_Network(DM dm, DM *newdm)
295: {
296:   DM_Network     *network = (DM_Network *) dm->data;

300:   network->refct++;
301:   (*newdm)->data = network;
302:   PetscObjectChangeTypeName((PetscObject) *newdm, DMNETWORK);
303:   DMInitialize_Network(*newdm);
304:   return(0);
305: }

307: /*MC
308:   DMNETWORK = "network" - A DM object that encapsulates an unstructured network. The implementation is based on the DM object
309:                           DMPlex that manages unstructured grids. Distributed networks use a non-overlapping partitioning of
310:                           the edges. In the local representation, Vecs contain all unknowns in the interior and shared boundary.
311:                           This is specified by a PetscSection object. Ownership in the global representation is determined by
312:                           ownership of the underlying DMPlex points. This is specified by another PetscSection object.

314:   Level: intermediate

316: .seealso: DMType, DMNetworkCreate(), DMCreate(), DMSetType()
317: M*/

319: PETSC_EXTERN PetscErrorCode DMCreate_Network(DM dm)
320: {
321:   DM_Network     *network;

326:   PetscNewLog(dm,&network);
327:   dm->data = network;

329:   network->refct     = 1;
330:   network->NVertices = 0;
331:   network->NEdges    = 0;
332:   network->nVertices = 0;
333:   network->nEdges    = 0;
334:   network->nsubnet   = 0;


337:   DMInitialize_Network(dm);
338:   return(0);
339: }

341: /*@
342:   DMNetworkCreate - Creates a DMNetwork object, which encapsulates an unstructured network.

344:   Collective

346:   Input Parameter:
347: . comm - The communicator for the DMNetwork object

349:   Output Parameter:
350: . network  - The DMNetwork object

352:   Level: beginner

354: @*/
355: PetscErrorCode DMNetworkCreate(MPI_Comm comm, DM *network)
356: {

361:   DMCreate(comm, network);
362:   DMSetType(*network, DMNETWORK);
363:   return(0);
364: }