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: }