Don Guinn wrote:
As to moving data around between various memories - I am not really clear on
the architecture of multi-core systems, but don't they consist of multiple
processors, each processor having its own cache but sharing a common main
memory? If so, then there is not a problem of having to move blocks of data
among different main memories.
There is a problem moving blocks of data between different chunks of
memory. It may be possible to hide the problem from application
programmers some, or even most, of the time, but it's there and it has a
cost. Partitioning a problem among available memory and processors
efficiently is often non-trivial.
There is not one multi-core architecture, but many. Different degrees
of parallelism and different workloads can drive different architectural
decisions. Processors may be symmetric or asymmetric, with local and/or
shared memory. Processors may communicate via shared memory, buses, or
crossbar switches. It isn't clear which architecture(s) general purpose
computers will use.
# Steve
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