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: }