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Why UML clustering will suck


At first, the performance of a UML cluster will suck. The reason is that it will spend all of its time copying popular data from one node to another and no time doing actual work.
The underlying reason is that this is an extreme NUMA machine. Normal NUMA boxes have some global memory shared between processors, plus smaller pieces of memory associated with each processor. A UML cluster has the local memory, but no global memory.