Hi all,<div>I have a MPI program as follows:</div><div>-------------------</div><div>int main(){</div><div>   MPI_Init();</div><div>   ......</div><div>   for (i=0; i&lt;10000; i++) {</div><div>      my_atomic_func();</div>
<div>   }</div><div>   ...</div><div>   MPI_Finalize();</div><div>   return 0;</div><div>}</div><div>--------------------</div><div><br></div><div>The runtime of this program mainly involves in running the loop and my_atomic_func() takes a little bit long. </div>
<div>Here I want my_atomic_func() to be operated atomically, but the timing of checkpointing (by running ompi-checkpoint command) may be in the middle of my_atomic_func() operation and hence ompi-restart may fail to restart correctly.</div>
<div><br></div><div>So my question is:</div><div>+ At the checkpoint time (executing ompi-checkpoint), is there a way to let OpenMPI wait until my_atomic_func()  finishes its operation?</div><div>+ How does ompi-checkpoint operate to checkpoint MPI threads? </div>
<div><br></div><div>Regards,</div><div>Nguyen Toan</div>