When I checkpoint my openmpi application using ompi_checkpoint, I see that top command suddenly shows some really huge numbers in "CPU %" field such as 150% 200% etc. After sometime, these numbers do come back to the normal numbers under 100%. This happens exactly around the time checkpoint is completed and when the processes are resuming the execution.


Another behavior I have seen is that one MPI process starts to show different elapsed time than its peers. Is it because checkpoint happened on behalf of this process?


For your reference, I am using open mpi 1.3.4 and BLCR 0.8.2 for checkpointing.



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