Hi,<br><br>I'm wondering what is the parallel complexity of MPI_Allgatherv. I would suspect in the worst case it would be something like N log P but from the timings i'm collecting this doesn't seem to be the case. I'm running tests on Kraken (<a href="http://www.nics.tennessee.edu/computing-resources/kraken">http://www.nics.tennessee.edu/computing-resources/kraken</a>) and it looks like it might be something like P log P.<br>
<br>Thanks,<br>Justin<br>