Actual source code: smg.c
1: #define PETSCKSP_DLL
3: /*
4: Additive Multigrid V Cycle routine
5: */
6: #include src/ksp/pc/impls/mg/mgimpl.h
10: PetscErrorCode PCMGACycle_Private(PC_MG **mg)
11: {
13: PetscInt i,l = mg[0]->levels;
14: PetscScalar zero = 0.0;
17: /* compute RHS on each level */
18: for (i=l-1; i>0; i--) {
19: MatRestrict(mg[i]->restrct,mg[i]->b,mg[i-1]->b);
20: }
21: /* solve seperately on each level */
22: for (i=0; i<l; i++) {
23: VecSet(mg[i]->x,zero);
24: if (mg[i]->eventsolve) {PetscLogEventBegin(mg[i]->eventsolve,0,0,0,0);}
25: KSPSolve(mg[i]->smoothd,mg[i]->b,mg[i]->x);
26: if (mg[i]->eventsolve) {PetscLogEventEnd(mg[i]->eventsolve,0,0,0,0);}
27: }
28: for (i=1; i<l; i++) {
29: MatInterpolateAdd(mg[i]->interpolate,mg[i-1]->x,mg[i]->x,mg[i]->x);
30: }
31: return(0);
32: }