56   Vec                  X, X_loc, rhs, rhs_loc;  in main()  local
136   PetscCall(DMCreateGlobalVector(dm, &X));  in main()
137   PetscCall(VecGetLocalSize(X, &l_size));  in main()
138   PetscCall(VecGetSize(X, &g_size));  in main()
141   PetscCall(VecDuplicate(X, &rhs));  in main()
228     PetscCall(KSPSolve(ksp, rhs, X));  in main()
240   PetscCall(VecZeroEntries(X));  in main()
249   PetscCall(KSPSolve(ksp, rhs, X));  in main()
281       PetscCall(ComputeL2Error(X, &l2_error, op_error_ctx));  in main()
305     PetscCall(VecView(X, vtk_viewer_soln));  in main()
310   PetscCall(VecDestroy(&X));  in main()