Actual source code: ex6.c

petsc-dev 2014-02-02
Report Typos and Errors
  1: static char help[] = "Tests various 3-dimensional DMDA routines.\n\n";

  3: #include <petscdmda.h>
  4: #include <petscao.h>

  8: int main(int argc,char **argv)
  9: {
 10:   PetscMPIInt      rank;
 11:   PetscInt         M = 3,N = 5,P=3,s=1,w=2,nloc,l,i,j,k,kk,m = PETSC_DECIDE,n = PETSC_DECIDE,p = PETSC_DECIDE;
 12:   PetscErrorCode   ierr;
 13:   PetscInt         Xs,Xm,Ys,Ym,Zs,Zm,iloc,*iglobal;
 14:   const PetscInt   *ltog;
 15:   PetscInt         *lx        = NULL,*ly = NULL,*lz = NULL;
 16:   PetscBool        test_order = PETSC_FALSE;
 17:   DM               da;
 18:   PetscViewer      viewer;
 19:   Vec              local,global;
 20:   PetscScalar      value;
 21:   DMDABoundaryType bx           = DMDA_BOUNDARY_NONE,by = DMDA_BOUNDARY_NONE,bz = DMDA_BOUNDARY_NONE;
 22:   DMDAStencilType  stencil_type = DMDA_STENCIL_BOX;
 23:   AO               ao;
 24:   PetscBool        flg = PETSC_FALSE;

 26:   PetscInitialize(&argc,&argv,(char*)0,help);
 27:   PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,400,300,&viewer);

 29:   /* Read options */
 30:   PetscOptionsGetInt(NULL,"-NX",&M,NULL);
 31:   PetscOptionsGetInt(NULL,"-NY",&N,NULL);
 32:   PetscOptionsGetInt(NULL,"-NZ",&P,NULL);
 33:   PetscOptionsGetInt(NULL,"-m",&m,NULL);
 34:   PetscOptionsGetInt(NULL,"-n",&n,NULL);
 35:   PetscOptionsGetInt(NULL,"-p",&p,NULL);
 36:   PetscOptionsGetInt(NULL,"-s",&s,NULL);
 37:   PetscOptionsGetInt(NULL,"-w",&w,NULL);
 38:   flg  = PETSC_FALSE;
 39:   PetscOptionsGetBool(NULL,"-star",&flg,NULL);
 40:   if (flg) stencil_type =  DMDA_STENCIL_STAR;
 41:   flg  = PETSC_FALSE;
 42:   PetscOptionsGetBool(NULL,"-box",&flg,NULL);
 43:   if (flg) stencil_type =  DMDA_STENCIL_BOX;

 45:   flg  = PETSC_FALSE;
 46:   PetscOptionsGetBool(NULL,"-xperiodic",&flg,NULL);
 47:   if (flg) bx = DMDA_BOUNDARY_PERIODIC;
 48:   flg  = PETSC_FALSE;
 49:   PetscOptionsGetBool(NULL,"-xghosted",&flg,NULL);
 50:   if (flg) bx = DMDA_BOUNDARY_GHOSTED;
 51:   flg  = PETSC_FALSE;
 52:   PetscOptionsGetBool(NULL,"-xnonghosted",&flg,NULL);

 54:   flg  = PETSC_FALSE;
 55:   PetscOptionsGetBool(NULL,"-yperiodic",&flg,NULL);
 56:   if (flg) by = DMDA_BOUNDARY_PERIODIC;
 57:   flg  = PETSC_FALSE;
 58:   PetscOptionsGetBool(NULL,"-yghosted",&flg,NULL);
 59:   if (flg) by = DMDA_BOUNDARY_GHOSTED;
 60:   flg  = PETSC_FALSE;
 61:   PetscOptionsGetBool(NULL,"-ynonghosted",&flg,NULL);

 63:   flg  = PETSC_FALSE;
 64:   PetscOptionsGetBool(NULL,"-zperiodic",&flg,NULL);
 65:   if (flg) bz = DMDA_BOUNDARY_PERIODIC;
 66:   flg  = PETSC_FALSE;
 67:   PetscOptionsGetBool(NULL,"-zghosted",&flg,NULL);
 68:   if (flg) bz = DMDA_BOUNDARY_GHOSTED;
 69:   flg  = PETSC_FALSE;
 70:   PetscOptionsGetBool(NULL,"-znonghosted",&flg,NULL);

 72:   PetscOptionsGetBool(NULL,"-testorder",&test_order,NULL);

 74:   flg  = PETSC_FALSE;
 75:   PetscOptionsGetBool(NULL,"-distribute",&flg,NULL);
 76:   if (flg) {
 77:     if (m == PETSC_DECIDE) SETERRQ(PETSC_COMM_WORLD,1,"Must set -m option with -distribute option");
 78:     PetscMalloc1(m,&lx);
 79:     for (i=0; i<m-1; i++) lx[i] = 4;
 80:     lx[m-1] = M - 4*(m-1);
 81:     if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_WORLD,1,"Must set -n option with -distribute option");
 82:     PetscMalloc1(n,&ly);
 83:     for (i=0; i<n-1; i++) ly[i] = 2;
 84:     ly[n-1] = N - 2*(n-1);
 85:     if (p == PETSC_DECIDE) SETERRQ(PETSC_COMM_WORLD,1,"Must set -p option with -distribute option");
 86:     PetscMalloc1(p,&lz);
 87:     for (i=0; i<p-1; i++) lz[i] = 2;
 88:     lz[p-1] = P - 2*(p-1);
 89:   }

 91:   /* Create distributed array and get vectors */
 92:   DMDACreate3d(PETSC_COMM_WORLD,bx,by,bz,stencil_type,M,N,P,m,n,p,w,s,lx,ly,lz,&da);
 93:   PetscFree(lx);
 94:   PetscFree(ly);
 95:   PetscFree(lz);
 96:   DMView(da,viewer);
 97:   DMCreateGlobalVector(da,&global);
 98:   DMCreateLocalVector(da,&local);

100:   /* Set global vector; send ghost points to local vectors */
101:   value = 1;
102:   VecSet(global,value);
103:   DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);
104:   DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);

106:   /* Scale local vectors according to processor rank; pass to global vector */
107:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
108:   value = rank;
109:   VecScale(local,value);
110:   DMLocalToGlobalBegin(da,local,INSERT_VALUES,global);
111:   DMLocalToGlobalEnd(da,local,INSERT_VALUES,global);

113:   if (!test_order) { /* turn off printing when testing ordering mappings */
114:     if (M*N*P<40) {
115:       PetscPrintf(PETSC_COMM_WORLD,"\nGlobal Vector:\n");
116:       VecView(global,PETSC_VIEWER_STDOUT_WORLD);
117:       PetscPrintf(PETSC_COMM_WORLD,"\n");
118:     }
119:   }

121:   /* Send ghost points to local vectors */
122:   DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);
123:   DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);

125:   flg  = PETSC_FALSE;
126:   PetscOptionsGetBool(NULL,"-local_print",&flg,NULL);
127:   if (flg) {
128:     PetscViewer sviewer;
129:     PetscViewerASCIISynchronizedAllow(PETSC_VIEWER_STDOUT_WORLD,PETSC_TRUE);
130:     PetscSynchronizedPrintf(PETSC_COMM_WORLD,"\nLocal Vector: processor %d\n",rank);
131:     PetscViewerGetSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
132:     VecView(local,sviewer);
133:     PetscViewerRestoreSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
134:     PetscSynchronizedFlush(PETSC_COMM_WORLD,PETSC_STDOUT);
135:   }

137:   /* Tests mappings betweeen application/PETSc orderings */
138:   if (test_order) {
139:     DMDAGetGhostCorners(da,&Xs,&Ys,&Zs,&Xm,&Ym,&Zm);
140:     DMDAGetGlobalIndices(da,&nloc,&ltog);
141:     DMDAGetAO(da,&ao);
142:     /* AOView(ao,PETSC_VIEWER_STDOUT_WORLD); */
143:     PetscMalloc1(nloc,&iglobal);

145:     /* Set iglobal to be global indices for each processor's local and ghost nodes,
146:        using the DMDA ordering of grid points */
147:     kk = 0;
148:     for (k=Zs; k<Zs+Zm; k++) {
149:       for (j=Ys; j<Ys+Ym; j++) {
150:         for (i=Xs; i<Xs+Xm; i++) {
151:           iloc = w*((k-Zs)*Xm*Ym + (j-Ys)*Xm + i-Xs);
152:           for (l=0; l<w; l++) {
153:             iglobal[kk++] = ltog[iloc+l];
154:           }
155:         }
156:       }
157:     }

159:     /* Map this to the application ordering (which for DMDAs is just the natural ordering
160:        that would be used for 1 processor, numbering most rapidly by x, then y, then z) */
161:     AOPetscToApplication(ao,nloc,iglobal);

163:     /* Then map the application ordering back to the PETSc DMDA ordering */
164:     AOApplicationToPetsc(ao,nloc,iglobal);

166:     /* Verify the mappings */
167:     kk=0;
168:     for (k=Zs; k<Zs+Zm; k++) {
169:       for (j=Ys; j<Ys+Ym; j++) {
170:         for (i=Xs; i<Xs+Xm; i++) {
171:           iloc = w*((k-Zs)*Xm*Ym + (j-Ys)*Xm + i-Xs);
172:           for (l=0; l<w; l++) {
173:             if (iglobal[kk] != ltog[iloc+l]) {
174:               PetscPrintf(MPI_COMM_WORLD,"[%D] Problem with mapping: z=%D, j=%D, i=%D, l=%D, petsc1=%D, petsc2=%D\n",
175:                       rank,k,j,i,l,ltog[iloc+l],iglobal[kk]);
176:             }
177:             kk++;
178:           }
179:         }
180:       }
181:     }
182:     PetscFree(iglobal);
183:     DMDARestoreGlobalIndices(da,&nloc,&ltog);
184:   }

186:   /* Free memory */
187:   PetscViewerDestroy(&viewer);
188:   VecDestroy(&local);
189:   VecDestroy(&global);
190:   DMDestroy(&da);
191:   PetscFinalize();
192:   return 0;
193: }