1 #define PETSCKSP_DLL 2 3 /* 4 Additive Multigrid V Cycle routine 5 */ 6 #include "src/ksp/pc/impls/mg/mgimpl.h" 7 8 #undef __FUNCT__ 9 #define __FUNCT__ "PCMGACycle_Private" 10 PetscErrorCode PCMGACycle_Private(PC_MG **mg) 11 { 12 PetscErrorCode ierr; 13 PetscInt i,l = mg[0]->levels; 14 PetscScalar zero = 0.0; 15 16 PetscFunctionBegin; 17 /* compute RHS on each level */ 18 for (i=l-1; i>0; i--) { 19 ierr = MatRestrict(mg[i]->restrct,mg[i]->b,mg[i-1]->b);CHKERRQ(ierr); 20 } 21 /* solve seperately on each level */ 22 for (i=0; i<l; i++) { 23 ierr = VecSet(mg[i]->x,zero);CHKERRQ(ierr); 24 if (mg[i]->eventsolve) {ierr = PetscLogEventBegin(mg[i]->eventsolve,0,0,0,0);CHKERRQ(ierr);} 25 ierr = KSPSolve(mg[i]->smoothd,mg[i]->b,mg[i]->x);CHKERRQ(ierr); 26 if (mg[i]->eventsolve) {ierr = PetscLogEventEnd(mg[i]->eventsolve,0,0,0,0);CHKERRQ(ierr);} 27 } 28 for (i=1; i<l; i++) { 29 ierr = MatInterpolateAdd(mg[i]->interpolate,mg[i-1]->x,mg[i]->x,mg[i]->x);CHKERRQ(ierr); 30 } 31 PetscFunctionReturn(0); 32 } 33