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When you have a large population of servers you have both the opportunity and the incentive to perform interesting studies. Authors from Google and the University of California in Optimizing Google’s Warehouse Scale Computers: The NUMA Experience conducted such a study, taking a look at how jobs run on clusters of machines using a NUMA architecture. Since NUMA is common on server class machines it's a topic of general interest for those looking to maximize machine utilization across clusters.
Some of the results are surprising: