1 2 /* 3 Additive Multigrid V Cycle routine 4 */ 5 #include <petsc/private/pcmgimpl.h> 6 7 PetscErrorCode PCMGACycle_Private(PC pc,PC_MG_Levels **mglevels,PetscBool transpose,PetscBool matapp) 8 { 9 PetscInt i,l = mglevels[0]->levels; 10 11 PetscFunctionBegin; 12 /* compute RHS on each level */ 13 for (i=l-1; i>0; i--) { 14 if (mglevels[i]->eventinterprestrict) PetscCall(PetscLogEventBegin(mglevels[i]->eventinterprestrict,0,0,0,0)); 15 if (!transpose) { 16 if (matapp) PetscCall(MatMatRestrict(mglevels[i]->restrct,mglevels[i]->B,&mglevels[i-1]->B)); 17 else PetscCall(MatRestrict(mglevels[i]->restrct,mglevels[i]->b,mglevels[i-1]->b)); 18 } else { 19 if (matapp) PetscCall(MatMatRestrict(mglevels[i]->interpolate,mglevels[i]->B,&mglevels[i-1]->B)); 20 else PetscCall(MatRestrict(mglevels[i]->interpolate,mglevels[i]->b,mglevels[i-1]->b)); 21 } 22 if (mglevels[i]->eventinterprestrict) PetscCall(PetscLogEventEnd(mglevels[i]->eventinterprestrict,0,0,0,0)); 23 } 24 /* solve separately on each level */ 25 for (i=0; i<l; i++) { 26 if (matapp) { 27 if (!mglevels[i]->X) { 28 PetscCall(MatDuplicate(mglevels[i]->B,MAT_DO_NOT_COPY_VALUES,&mglevels[i]->X)); 29 } else { 30 PetscCall(MatZeroEntries(mglevels[i]->X)); 31 } 32 } else { 33 PetscCall(VecZeroEntries(mglevels[i]->x)); 34 } 35 if (mglevels[i]->eventsmoothsolve) PetscCall(PetscLogEventBegin(mglevels[i]->eventsmoothsolve,0,0,0,0)); 36 if (!transpose) { 37 if (matapp) { 38 PetscCall(KSPMatSolve(mglevels[i]->smoothd,mglevels[i]->B,mglevels[i]->X)); 39 PetscCall(KSPCheckSolve(mglevels[i]->smoothd,pc,NULL)); 40 } else { 41 PetscCall(KSPSolve(mglevels[i]->smoothd,mglevels[i]->b,mglevels[i]->x)); 42 PetscCall(KSPCheckSolve(mglevels[i]->smoothd,pc,mglevels[i]->x)); 43 } 44 } else { 45 PetscCheck(!matapp,PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Not supported"); 46 PetscCall(KSPSolveTranspose(mglevels[i]->smoothu,mglevels[i]->b,mglevels[i]->x)); 47 PetscCall(KSPCheckSolve(mglevels[i]->smoothu,pc,mglevels[i]->x)); 48 } 49 if (mglevels[i]->eventsmoothsolve) PetscCall(PetscLogEventEnd(mglevels[i]->eventsmoothsolve,0,0,0,0)); 50 } 51 for (i=1; i<l; i++) { 52 if (mglevels[i]->eventinterprestrict) PetscCall(PetscLogEventBegin(mglevels[i]->eventinterprestrict,0,0,0,0)); 53 if (!transpose) { 54 if (matapp) PetscCall(MatMatInterpolateAdd(mglevels[i]->interpolate,mglevels[i-1]->X,mglevels[i]->X,&mglevels[i]->X)); 55 else PetscCall(MatInterpolateAdd(mglevels[i]->interpolate,mglevels[i-1]->x,mglevels[i]->x,mglevels[i]->x)); 56 } else { 57 if (matapp) PetscCall(MatMatInterpolateAdd(mglevels[i]->restrct,mglevels[i-1]->X,mglevels[i]->X,&mglevels[i]->X)); 58 else PetscCall(MatInterpolateAdd(mglevels[i]->restrct,mglevels[i-1]->x,mglevels[i]->x,mglevels[i]->x)); 59 } 60 if (mglevels[i]->eventinterprestrict) PetscCall(PetscLogEventEnd(mglevels[i]->eventinterprestrict,0,0,0,0)); 61 } 62 PetscFunctionReturn(0); 63 } 64