1ex125: nrhs 2 2 PETSC LU: 3 0-the LU numfactorization 4 0-the MatMatSolve 5 1-the MatMatSolve 6 0-the MatSolve 7 1-the MatSolve 8 1-the LU numfactorization 9 0-the MatMatSolve 10 1-the MatMatSolve 11 0-the MatSolve 12 1-the MatSolve 13