Actual source code: ex9.c

petsc-3.4.2 2013-07-02
  2: static char help[] = "Tests DMCreateColoring() in 3d.\n\n";

  4: #include <petscmat.h>
  5: #include <petscdmda.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;
 12:   PetscErrorCode  ierr;
 13:   PetscInt        *lx = NULL,*ly = NULL,*lz = NULL;
 14:   DM              da;
 15:   PetscBool       flg = PETSC_FALSE,test_order = PETSC_FALSE;
 16:   ISColoring      coloring;
 17:   Mat             mat;
 18:   DMDAStencilType stencil_type = DMDA_STENCIL_BOX;
 19:   Vec             lvec,dvec;
 20:   MatFDColoring   fdcoloring;

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

 24:   /* Read options */
 25:   PetscOptionsGetInt(NULL,"-M",&M,NULL);
 26:   PetscOptionsGetInt(NULL,"-N",&N,NULL);
 27:   PetscOptionsGetInt(NULL,"-P",&P,NULL);
 28:   PetscOptionsGetInt(NULL,"-m",&m,NULL);
 29:   PetscOptionsGetInt(NULL,"-n",&n,NULL);
 30:   PetscOptionsGetInt(NULL,"-p",&p,NULL);
 31:   PetscOptionsGetInt(NULL,"-s",&s,NULL);
 32:   PetscOptionsGetInt(NULL,"-w",&w,NULL);
 33:   PetscOptionsGetBool(NULL,"-star",&flg,NULL);
 34:   if (flg) stencil_type =  DMDA_STENCIL_STAR;
 35:   PetscOptionsGetBool(NULL,"-test_order",&test_order,NULL);
 36:   flg  = PETSC_FALSE;
 37:   PetscOptionsGetBool(NULL,"-distribute",&flg,NULL);
 38:   if (flg) {
 39:     if (m == PETSC_DECIDE) SETERRQ(PETSC_COMM_WORLD,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);

 44:     if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_WORLD,1,"Must set -n option with -distribute option");
 45:     PetscMalloc(n*sizeof(PetscInt),&ly);
 46:     for (i=0; i<n-1; i++) ly[i] = 2;
 47:     ly[n-1] = N - 2*(n-1);

 49:     if (p == PETSC_DECIDE) SETERRQ(PETSC_COMM_WORLD,1,"Must set -p option with -distribute option");
 50:     PetscMalloc(p*sizeof(PetscInt),&lz);
 51:     for (i=0; i<p-1; i++) lz[i] = 2;
 52:     lz[p-1] = P - 2*(p-1);
 53:   }

 55:   /* Create distributed array and get vectors */
 56:   DMDACreate3d(PETSC_COMM_WORLD,DMDA_BOUNDARY_NONE,DMDA_BOUNDARY_NONE,DMDA_BOUNDARY_NONE,stencil_type,M,N,P,m,n,p,w,s,lx,ly,lz,&da);
 57:   PetscFree(lx);
 58:   PetscFree(ly);
 59:   PetscFree(lz);

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

 65:   DMCreateGlobalVector(da,&dvec);
 66:   DMCreateLocalVector(da,&lvec);

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