At the moment, I believe the answer is the main memory route. We have
a project just starting here (LANL) to implement the cache-level
exchange, but it won't be ready for release for awhile.
On Jun 25, 2009, at 2:39 AM, Simone Pellegrini wrote:
Hello,
I have a simple question for the shared memory (sm) module
developers of Open MPI.
In the current implementation, is there any advantage of having
shared cache among processes communicating?
For example let say we have P1 and P2 placed in the same CPU on 2
different physical cores with shared cache, P1 wants to send a
message to P2 and the message is already in the cache.
How the message is being actually exchanged? Is the cache line
invalidated, written to main memory and exchanged by using some DMA
transfer... or is the message in the cache used (avoiding access to
the main memory)?
thanks in advance, Simone P.
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