Author: Robert Hyatt
Date: 20:14:42 12/05/02
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On December 05, 2002 at 20:04:57, Jeremiah Penery wrote: >On December 05, 2002 at 19:56:19, Robert Hyatt wrote: > >>On December 05, 2002 at 18:22:09, Jeremiah Penery wrote: >> >>>On December 05, 2002 at 18:10:40, Robert Hyatt wrote: >>> >>>>That's fine, but that is not the same thing as saying "each processor has a >>>>dedicated bus to its >>>>own memory". >>> >>>Each processor DOES have a dedicated bus to its own memory. >> >> >>One of the two statements can't be true. A crossbar is _not_ a dedicated bus. >> >>So either it is a dedicated bus which means NUMA, or it is a crossbar which >>means it is not a dedicated bus... > >Each processor has a dedicated bus to its local memory. Other processors access >that memory via the crossbar. That is A NUMA approach. "Non Uniform Memory Access/Arch". One gets it quickly, the other gets it less quickly. Nothing wrong with that but there is a big issue in distributing the data for efficiency.. The problem is that there is no easy way to have _two_ paths to a bank of memory, except for making it dual-ported, and then there are bank conflicts. I think this "solution" is going to be an interesting one to study when it comes out, as there are some obvious difficulties to overcome.
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