Author: Robert Hyatt
Date: 12:15:07 02/09/05
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On February 09, 2005 at 11:38:14, Matthew Hull wrote: >The quad opteron machines are NUMA. If a quad owner upgrades to dual-core >chips, are the dual cores SMP? If so, you have an SMP/NUMA combination. Seems >like someone answered this before, but it was not clear in my mind. > >IIRC, Bob said that a NUMA-aware program would need some modification to take >full advantage of a NUMA/SMP combination as described above. > >Am I understanding this correctly? Yes. The two opterons have separate cache, but a single path to the local memory they share. They both share that single path to the local memory, and to other nodes that have NUMA memory. The first goal has to be to reduce memory bandwidth requirements on the two nodes that share a path to memory. That can be done. Then there are the classic NUMA issues about where data physically is stored, vs where it is physically needed at execution time.
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