14b9ad928SBarry Smith /* 24b9ad928SBarry Smith Additive Multigrid V Cycle routine 34b9ad928SBarry Smith */ 44b9ad928SBarry Smith #include "src/ksp/pc/impls/mg/mgimpl.h" 54b9ad928SBarry Smith 64b9ad928SBarry Smith /* 74b9ad928SBarry Smith MGACycle_Private - Given an MG structure created with MGCreate() runs 84b9ad928SBarry Smith one cycle down through the levels and back up. Applys 94b9ad928SBarry Smith the smoothers in an additive manner. 104b9ad928SBarry Smith 114b9ad928SBarry Smith Iput Parameters: 124b9ad928SBarry Smith . mg - structure created with MGCreate(). 134b9ad928SBarry Smith 144b9ad928SBarry Smith */ 154b9ad928SBarry Smith #undef __FUNCT__ 164b9ad928SBarry Smith #define __FUNCT__ "MGACycle_Private" 17dfbe8321SBarry Smith PetscErrorCode MGACycle_Private(MG *mg) 184b9ad928SBarry Smith { 196849ba73SBarry Smith PetscErrorCode ierr; 20*79416396SBarry Smith PetscInt i,l = mg[0]->levels; 214b9ad928SBarry Smith PetscScalar zero = 0.0; 224b9ad928SBarry Smith 234b9ad928SBarry Smith PetscFunctionBegin; 244b9ad928SBarry Smith /* compute RHS on each level */ 254b9ad928SBarry Smith for (i=l-1; i>0; i--) { 264b9ad928SBarry Smith ierr = MatRestrict(mg[i]->restrct,mg[i]->b,mg[i-1]->b);CHKERRQ(ierr); 274b9ad928SBarry Smith } 284b9ad928SBarry Smith /* solve seperately on each level */ 294b9ad928SBarry Smith for (i=0; i<l; i++) { 304b9ad928SBarry Smith ierr = VecSet(&zero,mg[i]->x);CHKERRQ(ierr); 314b9ad928SBarry Smith if (mg[i]->eventsolve) {ierr = PetscLogEventBegin(mg[i]->eventsolve,0,0,0,0);CHKERRQ(ierr);} 3223ce1328SBarry Smith ierr = KSPSolve(mg[i]->smoothd,mg[i]->b,mg[i]->x);CHKERRQ(ierr); 334b9ad928SBarry Smith if (mg[i]->eventsolve) {ierr = PetscLogEventEnd(mg[i]->eventsolve,0,0,0,0);CHKERRQ(ierr);} 344b9ad928SBarry Smith } 354b9ad928SBarry Smith for (i=1; i<l; i++) { 364b9ad928SBarry Smith ierr = MatInterpolateAdd(mg[i]->interpolate,mg[i-1]->x,mg[i]->x,mg[i]->x);CHKERRQ(ierr); 374b9ad928SBarry Smith } 384b9ad928SBarry Smith PetscFunctionReturn(0); 394b9ad928SBarry Smith } 40