1 2 static char help[] = "Tests DMSwarm with DMShell\n\n"; 3 4 #include <petscsf.h> 5 #include <petscdm.h> 6 #include <petscdmshell.h> 7 #include <petscdmda.h> 8 #include <petscdmswarm.h> 9 #include <petsc/private/dmimpl.h> 10 11 12 PetscErrorCode _DMLocatePoints_DMDARegular_IS(DM dm,Vec pos,IS *iscell) 13 { 14 PetscInt p,n,bs,npoints,si,sj,milocal,mjlocal,mx,my; 15 DM dmregular; 16 PetscInt *cellidx; 17 const PetscScalar *coor; 18 PetscReal dx,dy; 19 PetscErrorCode ierr; 20 PetscMPIInt rank; 21 22 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 23 ierr = VecGetLocalSize(pos,&n);CHKERRQ(ierr); 24 ierr = VecGetBlockSize(pos,&bs);CHKERRQ(ierr); 25 npoints = n/bs; 26 27 ierr = PetscMalloc1(npoints,&cellidx);CHKERRQ(ierr); 28 ierr = DMGetApplicationContext(dm,(void**)&dmregular);CHKERRQ(ierr); 29 ierr = DMDAGetCorners(dmregular,&si,&sj,NULL,&milocal,&mjlocal,NULL);CHKERRQ(ierr); 30 ierr = DMDAGetInfo(dmregular,NULL,&mx,&my,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL);CHKERRQ(ierr); 31 32 dx = 2.0/((PetscReal)mx); 33 dy = 2.0/((PetscReal)my); 34 35 ierr = VecGetArrayRead(pos,&coor);CHKERRQ(ierr); 36 for (p=0; p<npoints; p++) { 37 PetscReal coorx,coory; 38 PetscInt mi,mj; 39 40 coorx = PetscRealPart(coor[2*p]); 41 coory = PetscRealPart(coor[2*p+1]); 42 43 mi = (PetscInt)( (coorx - (-1.0))/dx ); 44 mj = (PetscInt)( (coory - (-1.0))/dy ); 45 46 cellidx[p] = DMLOCATEPOINT_POINT_NOT_FOUND; 47 48 if ((mj >= sj) && (mj < sj + mjlocal)) { 49 if ((mi >= si) && (mi < si + milocal)) { 50 cellidx[p] = (mi-si) + (mj-sj) * milocal; 51 } 52 } 53 if (coorx < -1.0) cellidx[p] = DMLOCATEPOINT_POINT_NOT_FOUND; 54 if (coorx > 1.0) cellidx[p] = DMLOCATEPOINT_POINT_NOT_FOUND; 55 if (coory < -1.0) cellidx[p] = DMLOCATEPOINT_POINT_NOT_FOUND; 56 if (coory > 1.0) cellidx[p] = DMLOCATEPOINT_POINT_NOT_FOUND; 57 } 58 ierr = VecRestoreArrayRead(pos,&coor);CHKERRQ(ierr); 59 ierr = ISCreateGeneral(PETSC_COMM_SELF,npoints,cellidx,PETSC_OWN_POINTER,iscell);CHKERRQ(ierr); 60 PetscFunctionReturn(0); 61 } 62 63 PetscErrorCode DMLocatePoints_DMDARegular(DM dm,Vec pos,DMPointLocationType ltype, PetscSF cellSF) 64 { 65 IS iscell; 66 PetscSFNode *cells; 67 PetscInt p,bs,npoints,nfound; 68 const PetscInt *boxCells; 69 PetscErrorCode ierr; 70 71 ierr = _DMLocatePoints_DMDARegular_IS(dm,pos,&iscell);CHKERRQ(ierr); 72 ierr = VecGetLocalSize(pos,&npoints);CHKERRQ(ierr); 73 ierr = VecGetBlockSize(pos,&bs);CHKERRQ(ierr); 74 npoints = npoints / bs; 75 76 ierr = PetscMalloc1(npoints, &cells);CHKERRQ(ierr); 77 ierr = ISGetIndices(iscell, &boxCells);CHKERRQ(ierr); 78 79 for (p=0; p<npoints; p++) { 80 cells[p].rank = 0; 81 cells[p].index = DMLOCATEPOINT_POINT_NOT_FOUND; 82 cells[p].index = boxCells[p]; 83 } 84 ierr = ISRestoreIndices(iscell, &boxCells);CHKERRQ(ierr); 85 ierr = ISDestroy(&iscell);CHKERRQ(ierr); 86 nfound = npoints; 87 ierr = PetscSFSetGraph(cellSF, npoints, nfound, NULL, PETSC_OWN_POINTER, cells, PETSC_OWN_POINTER);CHKERRQ(ierr); 88 ierr = ISDestroy(&iscell);CHKERRQ(ierr); 89 PetscFunctionReturn(0); 90 } 91 92 PetscErrorCode DMGetNeighbors_DMDARegular(DM dm,PetscInt *nneighbors,const PetscMPIInt **neighbors) 93 { 94 DM dmregular; 95 PetscErrorCode ierr; 96 97 ierr = DMGetApplicationContext(dm,(void**)&dmregular);CHKERRQ(ierr); 98 ierr = DMGetNeighbors(dmregular,nneighbors,neighbors);CHKERRQ(ierr); 99 PetscFunctionReturn(0); 100 } 101 102 PetscErrorCode SwarmViewGP(DM dms,const char prefix[]) 103 { 104 PetscReal *array; 105 PetscInt *iarray; 106 PetscInt npoints,p,bs; 107 FILE *fp; 108 char name[PETSC_MAX_PATH_LEN]; 109 PetscMPIInt rank; 110 PetscErrorCode ierr; 111 112 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 113 ierr = PetscSNPrintf(name,PETSC_MAX_PATH_LEN-1,"%s-rank%d.gp",prefix,rank);CHKERRQ(ierr); 114 fp = fopen(name,"w"); 115 if (!fp) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_FILE_OPEN,"Cannot open file %s",name); 116 ierr = DMSwarmGetLocalSize(dms,&npoints);CHKERRQ(ierr); 117 ierr = DMSwarmGetField(dms,DMSwarmPICField_coor,&bs,NULL,(void**)&array);CHKERRQ(ierr); 118 ierr = DMSwarmGetField(dms,"itag",NULL,NULL,(void**)&iarray);CHKERRQ(ierr); 119 for (p=0; p<npoints; p++) { 120 fprintf(fp,"%+1.4e %+1.4e %1.4e\n",array[2*p],array[2*p+1],(double)iarray[p]); 121 } 122 ierr = DMSwarmRestoreField(dms,"itag",NULL,NULL,(void**)&iarray);CHKERRQ(ierr); 123 ierr = DMSwarmRestoreField(dms,DMSwarmPICField_coor,&bs,NULL,(void**)&array);CHKERRQ(ierr); 124 fclose(fp); 125 PetscFunctionReturn(0); 126 } 127 128 /* 129 Create a DMShell and attach a regularly spaced DMDA for point location 130 Override methods for point location 131 */ 132 PetscErrorCode ex3_1(void) 133 { 134 DM dms,dmcell,dmregular; 135 PetscMPIInt rank; 136 PetscInt p,bs,nlocal,overlap,mx,tk; 137 PetscReal dx; 138 PetscReal *array,dt; 139 PetscInt *iarray; 140 PetscRandom rand; 141 PetscErrorCode ierr; 142 143 144 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 145 146 /* Create a regularly spaced DMDA */ 147 mx = 40; 148 overlap = 0; 149 ierr = DMDACreate2d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,DMDA_STENCIL_BOX,mx,mx,PETSC_DECIDE,PETSC_DECIDE,1,overlap,NULL,NULL,&dmregular);CHKERRQ(ierr); 150 ierr = DMSetFromOptions(dmregular);CHKERRQ(ierr); 151 ierr = DMSetUp(dmregular);CHKERRQ(ierr); 152 153 dx = 2.0/((PetscReal)mx); 154 ierr = DMDASetUniformCoordinates(dmregular,-1.0+0.5*dx,1.0-0.5*dx,-1.0+0.5*dx,1.0-0.5*dx,-1.0,1.0);CHKERRQ(ierr); 155 156 /* Create a DMShell for point location purposes */ 157 ierr = DMShellCreate(PETSC_COMM_WORLD,&dmcell);CHKERRQ(ierr); 158 ierr = DMSetApplicationContext(dmcell,(void*)dmregular);CHKERRQ(ierr); 159 dmcell->ops->locatepoints = DMLocatePoints_DMDARegular; 160 dmcell->ops->getneighbors = DMGetNeighbors_DMDARegular; 161 162 /* Create the swarm */ 163 ierr = DMCreate(PETSC_COMM_WORLD,&dms);CHKERRQ(ierr); 164 ierr = DMSetType(dms,DMSWARM);CHKERRQ(ierr); 165 ierr = DMSetDimension(dms,2);CHKERRQ(ierr); 166 167 ierr = DMSwarmSetType(dms,DMSWARM_PIC);CHKERRQ(ierr); 168 ierr = DMSwarmSetCellDM(dms,dmcell);CHKERRQ(ierr); 169 170 ierr = DMSwarmRegisterPetscDatatypeField(dms,"itag",1,PETSC_INT);CHKERRQ(ierr); 171 ierr = DMSwarmFinalizeFieldRegister(dms);CHKERRQ(ierr); 172 { 173 PetscInt si,sj,milocal,mjlocal; 174 const PetscScalar *LA_coors; 175 Vec coors; 176 PetscInt cnt; 177 178 ierr = DMDAGetCorners(dmregular,&si,&sj,NULL,&milocal,&mjlocal,NULL);CHKERRQ(ierr); 179 ierr = DMGetCoordinates(dmregular,&coors);CHKERRQ(ierr); 180 ierr = VecGetArrayRead(coors,&LA_coors);CHKERRQ(ierr); 181 ierr = DMSwarmSetLocalSizes(dms,milocal*mjlocal,4);CHKERRQ(ierr); 182 ierr = DMSwarmGetLocalSize(dms,&nlocal);CHKERRQ(ierr); 183 ierr = DMSwarmGetField(dms,DMSwarmPICField_coor,&bs,NULL,(void**)&array);CHKERRQ(ierr); 184 cnt = 0; 185 ierr = PetscRandomCreate(PETSC_COMM_SELF,&rand);CHKERRQ(ierr); 186 ierr = PetscRandomSetInterval(rand,-1.0,1.0);CHKERRQ(ierr); 187 for (p=0; p<nlocal; p++) { 188 PetscReal px,py,rx,ry,r2; 189 190 ierr = PetscRandomGetValueReal(rand,&rx);CHKERRQ(ierr); 191 ierr = PetscRandomGetValueReal(rand,&ry);CHKERRQ(ierr); 192 193 px = PetscRealPart(LA_coors[2*p+0]) + 0.1*rx*dx; 194 py = PetscRealPart(LA_coors[2*p+1]) + 0.1*ry*dx; 195 196 r2 = px*px + py*py; 197 if (r2 < 0.75*0.75) { 198 array[bs*cnt+0] = px; 199 array[bs*cnt+1] = py; 200 cnt++; 201 } 202 } 203 ierr = PetscRandomDestroy(&rand);CHKERRQ(ierr); 204 ierr = DMSwarmRestoreField(dms,DMSwarmPICField_coor,&bs,NULL,(void**)&array);CHKERRQ(ierr); 205 ierr = VecRestoreArrayRead(coors,&LA_coors);CHKERRQ(ierr); 206 ierr = DMSwarmSetLocalSizes(dms,cnt,4);CHKERRQ(ierr); 207 208 ierr = DMSwarmGetLocalSize(dms,&nlocal);CHKERRQ(ierr); 209 ierr = DMSwarmGetField(dms,"itag",&bs,NULL,(void**)&iarray);CHKERRQ(ierr); 210 for (p=0; p<nlocal; p++) { 211 iarray[p] = (PetscInt)rank; 212 } 213 ierr = DMSwarmRestoreField(dms,"itag",&bs,NULL,(void**)&iarray);CHKERRQ(ierr); 214 } 215 216 ierr = DMView(dms,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 217 ierr = SwarmViewGP(dms,"step0");CHKERRQ(ierr); 218 219 dt = 0.1; 220 for (tk=1; tk<20; tk++) { 221 char prefix[PETSC_MAX_PATH_LEN]; 222 PetscPrintf(PETSC_COMM_WORLD,"Step %D \n",tk); 223 /* push points */ 224 ierr = DMSwarmGetLocalSize(dms,&nlocal);CHKERRQ(ierr); 225 ierr = DMSwarmGetField(dms,DMSwarmPICField_coor,&bs,NULL,(void**)&array);CHKERRQ(ierr); 226 for (p=0; p<nlocal; p++) { 227 PetscReal cx,cy,vx,vy; 228 229 cx = array[2*p]; 230 cy = array[2*p+1]; 231 vx = cy; 232 vy = -cx; 233 234 array[2*p ] += dt * vx; 235 array[2*p+1] += dt * vy; 236 } 237 ierr = DMSwarmRestoreField(dms,DMSwarmPICField_coor,&bs,NULL,(void**)&array);CHKERRQ(ierr); 238 239 /* migrate points */ 240 ierr = DMSwarmMigrate(dms,PETSC_TRUE);CHKERRQ(ierr); 241 /* view points */ 242 ierr = PetscSNPrintf(prefix,PETSC_MAX_PATH_LEN-1,"step%d",tk);CHKERRQ(ierr); 243 /* should use the regular SwarmView() api, not one for a particular type */ 244 ierr = SwarmViewGP(dms,prefix);CHKERRQ(ierr); 245 } 246 ierr = DMDestroy(&dmregular);CHKERRQ(ierr); 247 ierr = DMDestroy(&dmcell);CHKERRQ(ierr); 248 ierr = DMDestroy(&dms);CHKERRQ(ierr); 249 PetscFunctionReturn(0); 250 } 251 252 int main(int argc,char **argv) 253 { 254 PetscErrorCode ierr; 255 256 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 257 ierr = ex3_1();CHKERRQ(ierr); 258 ierr = PetscFinalize(); 259 return ierr; 260 } 261 262 /*TEST 263 264 build: 265 requires: double !complex 266 267 test: 268 filter: grep -v atomic 269 filter_output: grep -v atomic 270 TEST*/ 271