Help in understanding -log_summary output

[Rafael Santos Coelho]

>  Global gives the percentage of the  time/flops/messages/total message
> data/reductions in this event out of the TOTAL RUNTIME (basically from
> PetscInitialize() to PETScFinalize(). So 5 percent of the total runtime was
> in this event and 99 percent of the messages (99 is rounded down from 100
> so it is probably essentially 100%).


I see, but then how come the sum of all those global percentages don`t equal
100%?
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