1431   KSP          eksp;  in PCGAMGOptimizeProlongator_AGG()  local
1453       PetscCall(KSPCreate(comm, &eksp));  in PCGAMGOptimizeProlongator_AGG()
1454       PetscCall(KSPSetNestLevel(eksp, pc->kspnestlevel));  in PCGAMGOptimizeProlongator_AGG()
1456       PetscCall(KSPSetOptionsPrefix(eksp, prefix));  in PCGAMGOptimizeProlongator_AGG()
1457       PetscCall(KSPAppendOptionsPrefix(eksp, "pc_gamg_esteig_"));  in PCGAMGOptimizeProlongator_AGG()
1462         if (isset && sflg) PetscCall(KSPSetType(eksp, KSPCG));  in PCGAMGOptimizeProlongator_AGG()
1464       PetscCall(KSPSetErrorIfNotConverged(eksp, pc->erroriffailure));  in PCGAMGOptimizeProlongator_AGG()
1465       PetscCall(KSPSetNormType(eksp, KSP_NORM_NONE));  in PCGAMGOptimizeProlongator_AGG()
1467       PetscCall(KSPSetInitialGuessNonzero(eksp, PETSC_FALSE));  in PCGAMGOptimizeProlongator_AGG()
1468       PetscCall(KSPSetOperators(eksp, Amat, Amat));  in PCGAMGOptimizeProlongator_AGG()
1470       PetscCall(KSPGetPC(eksp, &epc));  in PCGAMGOptimizeProlongator_AGG()
1473 …PetscCall(KSPSetTolerances(eksp, PETSC_CURRENT, PETSC_CURRENT, PETSC_CURRENT, 10)); // 10 is safer…  in PCGAMGOptimizeProlongator_AGG()
1475       PetscCall(KSPSetFromOptions(eksp));  in PCGAMGOptimizeProlongator_AGG()
1476       PetscCall(KSPSetComputeSingularValues(eksp, PETSC_TRUE));  in PCGAMGOptimizeProlongator_AGG()
1477       PetscCall(KSPSolve(eksp, bb, xx));  in PCGAMGOptimizeProlongator_AGG()
1478       PetscCall(KSPCheckSolve(eksp, pc, xx));  in PCGAMGOptimizeProlongator_AGG()
1480       PetscCall(KSPComputeExtremeSingularValues(eksp, &emax, &emin));  in PCGAMGOptimizeProlongator_AGG()
1484       PetscCall(KSPDestroy(&eksp));  in PCGAMGOptimizeProlongator_AGG()