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Why UML clustering will suck
Performance will suck
Virtual machine will spend all of its time faulting pages from one node to another
An example of an extreme NUMA
- no global memory
- extremely expensive access to other nodes' local memory
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.