Actual source code: ex29.c
1: /*$Id: ex29.c,v 1.21 2001/09/11 16:32:10 bsmith Exp $*/
3: static char help[] = "Tests VecSetValues and VecSetValuesBlocked() on MPI vectors.n
4: Where atleast a couple of mallocs will occur in the stash code.nn";
6: #include petscvec.h
7: #include petscsys.h
9: int main(int argc,char **argv)
10: {
11: int i,j,n = 50,ierr,bs,size;
12: PetscScalar val,*vals,zero=0.0;
13: Vec x;
15: PetscInitialize(&argc,&argv,(char*)0,help);
16: MPI_Comm_size(PETSC_COMM_WORLD,&size);
17: bs = size;
19: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
20: VecCreate(PETSC_COMM_WORLD,&x);
21: VecSetSizes(x,PETSC_DECIDE,n*bs);
22: VecSetBlockSize(x,bs);
23: VecSetFromOptions(x);
25: for (i=0; i<n*bs; i++) {
26: val = i*1.0;
27: VecSetValues(x,1,&i,&val,INSERT_VALUES);
28: }
29: VecAssemblyBegin(x);
30: VecAssemblyEnd(x);
32: VecView(x,PETSC_VIEWER_STDOUT_WORLD);
34: /* Now do the blocksetvalues */
35: VecSet(&zero,x);
36: PetscMalloc(bs*sizeof(PetscScalar),&vals);
37: for (i=0; i<n; i++) {
38: for (j=0; j<bs; j++) {
39: vals[j] = (i*bs+j)*1.0;
40: }
41: VecSetValuesBlocked(x,1,&i,vals,INSERT_VALUES);
42: }
44: VecAssemblyBegin(x);
45: VecAssemblyEnd(x);
47: VecView(x,PETSC_VIEWER_STDOUT_WORLD);
49: VecDestroy(x);
50: PetscFree(vals);
51: PetscFinalize();
52: return 0;
53: }
54: