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Subject: [OMPI users] Question on handling of memory for communications
From: Michael Thomadakis (drmichaelt7777_at_[hidden])
Date: 2013-07-06 16:59:48


Hello OpenMPI,

When you stack runs on SandyBridge nodes atached to HCAs ove PCI3 *gen
3*do you pay any special attention to the memory buffers according to
which
socket/memory controller their physical memory belongs to?

For instance, if the HCA is attached to the PCIgen3 lanes of Socket 1 do
you do anything special when the read/write buffers map to physical memory
belonging to Socket 2? Or do you7 avoid using buffers mapping ro memory
that belongs (is accessible via) the other socket?

Has this situation improved with Ivy-Brige systems or Haswell?

Cheers
Michael