Actual source code: ex9.c

  1: 
  2: static char help[] = "Tests DAGetColoring() in 3d.\n\n";

 4:  #include petscmat.h
 5:  #include petscda.h

  9: int main(int argc,char **argv)
 10: {
 11:   PetscInt       i,M = 3,N = 5,P=3,s=1,w=2,m = PETSC_DECIDE,n = PETSC_DECIDE,p = PETSC_DECIDE;
 13:   PetscInt       *lx = PETSC_NULL,*ly = PETSC_NULL,*lz = PETSC_NULL;
 14:   DA             da;
 15:   PetscTruth     flg = PETSC_FALSE,test_order = PETSC_FALSE;
 16:   ISColoring     coloring;
 17:   Mat            mat;
 18:   DAStencilType  stencil_type = DA_STENCIL_BOX;
 19:   Vec            lvec,dvec;
 20:   MatFDColoring  fdcoloring;

 22:   PetscInitialize(&argc,&argv,(char*)0,help);

 24:   /* Read options */
 25:   PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
 26:   PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
 27:   PetscOptionsGetInt(PETSC_NULL,"-P",&P,PETSC_NULL);
 28:   PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
 29:   PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
 30:   PetscOptionsGetInt(PETSC_NULL,"-p",&p,PETSC_NULL);
 31:   PetscOptionsGetInt(PETSC_NULL,"-s",&s,PETSC_NULL);
 32:   PetscOptionsGetInt(PETSC_NULL,"-w",&w,PETSC_NULL);
 33:   PetscOptionsGetTruth(PETSC_NULL,"-star",&flg,PETSC_NULL);
 34:   if (flg) stencil_type =  DA_STENCIL_STAR;
 35:   PetscOptionsGetTruth(PETSC_NULL,"-test_order",&test_order,PETSC_NULL);
 36:   flg  = PETSC_FALSE;
 37:   PetscOptionsGetTruth(PETSC_NULL,"-distribute",&flg,PETSC_NULL);
 38:   if (flg) {
 39:     if (m == PETSC_DECIDE) SETERRQ(1,"Must set -m option with -distribute option");
 40:     PetscMalloc(m*sizeof(PetscInt),&lx);
 41:     for (i=0; i<m-1; i++) { lx[i] = 4;}
 42:     lx[m-1] = M - 4*(m-1);
 43:     if (n == PETSC_DECIDE) SETERRQ(1,"Must set -n option with -distribute option");
 44:     PetscMalloc(n*sizeof(PetscInt),&ly);
 45:     for (i=0; i<n-1; i++) { ly[i] = 2;}
 46:     ly[n-1] = N - 2*(n-1);
 47:     if (p == PETSC_DECIDE) SETERRQ(1,"Must set -p option with -distribute option");
 48:     PetscMalloc(p*sizeof(PetscInt),&lz);
 49:     for (i=0; i<p-1; i++) { lz[i] = 2;}
 50:     lz[p-1] = P - 2*(p-1);
 51:   }

 53:   /* Create distributed array and get vectors */
 54:   DACreate3d(PETSC_COMM_WORLD,DA_NONPERIODIC,stencil_type,M,N,P,m,n,p,w,s,lx,ly,lz,&da);
 55:   if (lx) {
 56:     PetscFree(lx);
 57:     PetscFree(ly);
 58:     PetscFree(lz);
 59:   }

 61:   DAGetColoring(da,IS_COLORING_GLOBAL,MATMPIAIJ,&coloring);
 62:   DAGetMatrix(da,MATMPIAIJ,&mat);
 63:   MatFDColoringCreate(mat,coloring,&fdcoloring);

 65:   DACreateGlobalVector(da,&dvec);
 66:   DACreateLocalVector(da,&lvec);

 68:   /* Free memory */
 69:   MatFDColoringDestroy(fdcoloring);
 70:   VecDestroy(dvec);
 71:   VecDestroy(lvec);
 72:   MatDestroy(mat);
 73:   ISColoringDestroy(coloring);
 74:   DADestroy(da);
 75:   PetscFinalize();
 76:   return 0;
 77: }
 78: