 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bus inevitably
becomes a bottleneck when many
|
|
|
processors are
used
|
|
|
|
|
Use a more
general interconnection network
|
|
|
|
|
So snooping does
not work
|
|
|
| |
DRAM
memory is also distributed
|
|
|
|
|
Each node
allocates space from local DRAM
|
|
|
|
|
Copies of
remote data are made in cache
|
|
|
| |
Major design
issues:
|
|
|
|
|
How to find and
represent the directory" of each line?
|
|
|
|
|
How to find a
copy of a line?
|
|
|
| |
As a case study,
we will look at S3.MP (Sun's
|
|
|
Scalable Shared
memory Multi-Processor, a CC-
|
|
|
NUMA
(cache-coherent non-uniform memory access)
|
|
architecture
|
|
