On Jan 18, 2006, at 11:23 PM, Paul Greidanus wrote:
Ok, can I s/hypertransport/SMP/g on the message, which is more what
I'm thinking of.. the details of the memory subsys inside of a
machine aren't really all that important to this question.. but,
will the LAM that comes with Oscar use mem->mem copies, rather then
using the IP stack, or even worse, send it out to the network
device itself?
Yes, the LAM that comes with OSCAR has shared memory support. So if
you run all your processes in the same node, LAM should automatically
do the Right Thing and use shared memory for message transport.
If you use TCP across nodes, LAM should also do the Right Thing and
use shared memory on-node and TCP off-node. LAM's IB support does
not include shared memory on-node -- it uses IB for all communication
(both on and off node), which, although sub-optimal, is not as bad as
it sounds because the IB HCA has a nice DMA engine.
--
{+} Jeff Squyres
{+} The Open MPI Project
{+} http://www.open-mpi.org/
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