Actual source code: ex3.c

  1: static char help[] = "This example tests subnetwork coupling. \n\
  2:               \n\n";

  4: /* T
  5:   Concepts: DMNetwork
  6: */
  7: #include <petscdmnetwork.h>

  9: typedef struct{
 10:   PetscInt id;
 11: } Comp0;

 13: typedef struct{
 14:   PetscScalar val;
 15: } Comp1;

 17: int main(int argc,char ** argv)
 18: {
 19:   PetscMPIInt    size,rank;
 20:   DM             dmnetwork;
 21:   PetscInt       i,j,net,Nsubnet,nsubnet,ne,nv,nvar,v,ncomp,compkey0,compkey1,compkey,goffset,row;
 22:   PetscInt       numEdges[10],*edgelist[10],asvtx,bsvtx;
 23:   const PetscInt *vtx,*edges;
 24:   PetscBool      sharedv,ghost,distribute=PETSC_TRUE,test=PETSC_FALSE;
 25:   Vec            X;
 26:   Comp0          comp0;
 27:   Comp1          comp1;
 28:   PetscScalar    val;

 30:   PetscInitialize(&argc,&argv,(char*)0,help);
 31:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 32:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

 34:   /* Create a network of subnetworks */
 35:   nsubnet = 1;
 36:   if (size == 1) nsubnet = 2;

 38:   /* Create a dmnetwork and register components */
 39:   DMNetworkCreate(PETSC_COMM_WORLD,&dmnetwork);
 40:   DMNetworkRegisterComponent(dmnetwork,"comp0",sizeof(Comp0),&compkey0);
 41:   DMNetworkRegisterComponent(dmnetwork,"comp1",sizeof(Comp1),&compkey1);

 43:   /* Set componnet values - intentionally take rank-dependent value for test */
 44:   comp0.id  = rank;
 45:   comp1.val = 10.0*rank;

 47:   /* Set number of subnetworks, numbers of vertices and edges over each subnetwork */
 48:   DMNetworkSetNumSubNetworks(dmnetwork,nsubnet,PETSC_DECIDE);
 49:   DMNetworkGetNumSubNetworks(dmnetwork,NULL,&Nsubnet);

 51:   /* Input subnetworks; when size>1, process[i] creates subnetwork[i] */
 52:   for (i=0; i<Nsubnet; i++) numEdges[i] = 0;
 53:   for (i=0; i<Nsubnet; i++) {
 54:     if (i == 0 && (size == 1 || (rank == i && size >1))) {
 55:       numEdges[i] = 3;
 56:       PetscMalloc1(2*numEdges[i],&edgelist[i]);
 57:       edgelist[i][0] = 0; edgelist[i][1] = 2;
 58:       edgelist[i][2] = 2; edgelist[i][3] = 1;
 59:       edgelist[i][4] = 1; edgelist[i][5] = 3;

 61:     } else if (i == 1 && (size == 1 || (rank == i && size >1))) {
 62:       numEdges[i] = 3;
 63:       PetscMalloc1(2*numEdges[i],&edgelist[i]);
 64:       edgelist[i][0] = 0; edgelist[i][1] = 3;
 65:       edgelist[i][2] = 3; edgelist[i][3] = 2;
 66:       edgelist[i][4] = 2; edgelist[i][5] = 1;

 68:     } else if (i>1 && (size == 1 || (rank == i && size >1))) {
 69:       numEdges[i] = 3;
 70:       PetscMalloc1(2*numEdges[i],&edgelist[i]);
 71:       for (j=0; j< numEdges[i]; j++) {
 72:         edgelist[i][2*j] = j; edgelist[i][2*j+1] = j+1;
 73:       }
 74:     }
 75:   }

 77:   /* Add subnetworks */
 78:   for (i=0; i<Nsubnet; i++) {
 79:     PetscInt netNum = -1;
 80:     DMNetworkAddSubnetwork(dmnetwork,NULL,numEdges[i],edgelist[i],&netNum);
 81:   }

 83:   /* Add shared vertices -- all processes hold this info at current implementation */
 84:   asvtx = bsvtx = 0;
 85:   for (j=1; j<Nsubnet; j++) {
 86:     /* vertex subnet[0].0 shares with vertex subnet[j].0 */
 87:     DMNetworkAddSharedVertices(dmnetwork,0,j,1,&asvtx,&bsvtx);
 88:   }

 90:   /* Setup the network layout */
 91:   DMNetworkLayoutSetUp(dmnetwork);

 93:   /* Get Subnetwork(); Add nvar=1 to subnet[0] and nvar=2 to other subnets */
 94:   for (net=0; net<Nsubnet; net++) {
 95:     DMNetworkGetSubnetwork(dmnetwork,net,&nv,&ne,&vtx,&edges);
 96:     for (v=0; v<nv; v++) {
 97:       DMNetworkIsSharedVertex(dmnetwork,vtx[v],&sharedv);
 98:       if (sharedv) continue;

100:       if (!net) {
101:         DMNetworkAddComponent(dmnetwork,vtx[v],compkey0,&comp0,1);
102:       } else {
103:         DMNetworkAddComponent(dmnetwork,vtx[v],compkey1,&comp1,2);
104:       }
105:     }
106:   }

108:   /* Add components and nvar to shared vertex -- owning and all ghost ranks must call DMNetworkAddComponent() */
109:   DMNetworkGetSharedVertices(dmnetwork,&nv,&vtx);
110:   for (v=0; v<nv; v++) {
111:     DMNetworkAddComponent(dmnetwork,vtx[v],compkey0,&comp0,1);
112:     DMNetworkAddComponent(dmnetwork,vtx[v],compkey1,&comp1,2);
113:   }

115:   /* Enable runtime option of graph partition type -- must be called before DMSetUp() */
116:   if (size > 1) {
117:     DM               plexdm;
118:     PetscPartitioner part;
119:     DMNetworkGetPlex(dmnetwork,&plexdm);
120:     DMPlexGetPartitioner(plexdm, &part);
121:     PetscPartitionerSetType(part,PETSCPARTITIONERSIMPLE);
122:     PetscOptionsSetValue(NULL,"-dm_plex_csr_alg","mat"); /* for parmetis */
123:   }

125:   /* Setup dmnetwork */
126:   DMSetUp(dmnetwork);

128:   /* Redistribute the network layout; use '-distribute false' to skip */
129:   PetscOptionsGetBool(NULL,NULL,"-distribute",&distribute,NULL);
130:   if (distribute) {
131:     DMNetworkDistribute(&dmnetwork,0);
132:     DMView(dmnetwork,PETSC_VIEWER_STDOUT_WORLD);
133:   }

135:   /* Create a global vector */
136:   DMCreateGlobalVector(dmnetwork,&X);
137:   VecSet(X,0.0);

139:   /* Set X values at shared vertex */
140:   DMNetworkGetSharedVertices(dmnetwork,&nv,&vtx);
141:   for (v=0; v<nv; v++) {
142:     DMNetworkIsGhostVertex(dmnetwork,vtx[v],&ghost);
143:     if (ghost) continue;

145:     /* only one process holds a non-ghost vertex */
146:     DMNetworkGetComponent(dmnetwork,vtx[v],ALL_COMPONENTS,NULL,NULL,&nvar);
147:     DMNetworkGetNumComponents(dmnetwork,vtx[v],&ncomp);
148:     /* PetscPrintf(PETSC_COMM_SELF,"[%d] shared v %D: nvar %D, ncomp %D\n",rank,vtx[v],nvar,ncomp); */
149:     for (j=0; j<ncomp; j++) {
150:       DMNetworkGetComponent(dmnetwork,vtx[v],j,&compkey,NULL,&nvar);
151:       DMNetworkGetGlobalVecOffset(dmnetwork,vtx[v],j,&goffset);
152:       for (i=0; i<nvar; i++) {
153:         row = goffset + i;
154:         val = compkey + 1.0;
155:         VecSetValues(X,1,&row,&val,INSERT_VALUES);
156:       }
157:     }
158:   }
159:   VecAssemblyBegin(X);
160:   VecAssemblyEnd(X);
161:   VecView(X,PETSC_VIEWER_STDOUT_WORLD);

163:   /* Test DMNetworkGetSubnetwork() */
164:   PetscOptionsGetBool(NULL,NULL,"-test_getsubnet",&test,NULL);
165:   if (test) {
166:     net = 0;
167:     PetscOptionsGetInt(NULL,NULL,"-subnet",&net,NULL);
168:     DMNetworkGetSubnetwork(dmnetwork,net,&nv,&ne,&vtx,&edges);
169:     PetscSynchronizedPrintf(PETSC_COMM_WORLD,"[%d] subnet %D: nv %D, ne %D\n",rank,net,nv,ne);
170:     PetscSynchronizedFlush(PETSC_COMM_WORLD,PETSC_STDOUT);
171:     MPI_Barrier(PETSC_COMM_WORLD);

173:     for (i=0; i<nv; i++) {
174:       DMNetworkIsGhostVertex(dmnetwork,vtx[i],&ghost);
175:       DMNetworkIsSharedVertex(dmnetwork,vtx[i],&sharedv);

177:       DMNetworkGetNumComponents(dmnetwork,vtx[i],&ncomp);
178:       if (sharedv || ghost) {
179:         PetscPrintf(PETSC_COMM_SELF,"  [%d] v %D is shared %d, is ghost %d, ncomp %D\n",rank,vtx[i],sharedv,ghost,ncomp);
180:       }

182:       for (j=0; j<ncomp; j++) {
183:         void* component;
184:         DMNetworkGetComponent(dmnetwork,vtx[i],j,&compkey,(void**)&component,NULL);
185:         if (compkey == 0) {
186:           Comp0  *mycomp0;
187:           mycomp0 = (Comp0*)component;
188:           PetscPrintf(PETSC_COMM_SELF,"  [%d] v %D compkey %D, mycomp0->id %D\n",rank,vtx[i],compkey,mycomp0->id);
189:         } else if (compkey == 1) {
190:           Comp1  *mycomp1;
191:           mycomp1 = (Comp1*)component;
192:           PetscPrintf(PETSC_COMM_SELF,"  [%d] v %D compkey %D, mycomp1->val %g\n",rank,vtx[i],compkey,mycomp1->val);
193:         }
194:       }
195:     }
196:   }

198:   /* Free work space */
199:   VecDestroy(&X);
200:   for (i=0; i<Nsubnet; i++) {
201:     if (size == 1 || rank == i) PetscFree(edgelist[i]);
202:   }

204:   DMDestroy(&dmnetwork);
205:   PetscFinalize();
206:   return 0;
207: }

209: /*TEST

211:    build:
212:       requires: !single double defined(PETSC_HAVE_ATTRIBUTEALIGNED)

214:    test:
215:       args:

217:    test:
218:       suffix: 2
219:       nsize: 2
220:       args: -options_left no

222:    test:
223:       suffix: 3
224:       nsize: 4
225:       args: -options_left no

227: TEST*/