Dear Professor, I have a question about the bjacobi+ilu, I'm in the place   src/ksp/ksp/tutorials  and running the ex2 with mpirun -np 40 -bind-to core ./ex2 -m 2000 -n 2000  -ksp_max_it 1000000 -ksp_rtol 1e-10 -ksp_type gmres -pc_type bjacobi -sub_pc_type ilu  -sub_pc_factor_levels 10 -ksp_monitor_short on the Intel machine with 40 cores, the petsc is complied with MKL and ICC/MPIICC with O3. I found the numerical results are not the same from time to time, although they all right, the iterations are not exactly the same from time to time. Where have I done wrong? I'm looking forward to hear you! Best, Gang Chen Sichuan Univertsity, School of Mathematics, Chengdu, China