Hi,
I'm taking a look at knem, to see if it improves the performance of any
applications on our QDR InfiniBand cluster, so I'm eager to hear about
other people's experiences. This doesn't appear to have been discussed on
this list before.
I appreciate that any affect that knem will have is e
FWIW: a long time ago (read: many Open MPI / knem versions ago), I did a few
benchmarks with knem vs. no knem Open MPI installations. IIRC, I used the
typical suspects like NetPIPE, the NPBs, etc. There was a modest performance
improvement (I don't remember the numbers offhand); it was a small
On Fri, 12 Jul 2013, Jeff Squyres (jsquyres) wrote:
...
In short: doing 1 memcopy consumes half the memory bandwidth of 2 mem
copies. So when you have lots of MPI processes competing for memory
bandwidth, it turns out that having each MPI process use half the
bandwidth is a Really Good Idea.
