The FNN (Flat Neighborhood Network) paradox
Robert G. Brown
rgb at phy.duke.edu
Wed Feb 28 16:28:46 PST 2001
On Thu, 22 Feb 2001, Jon Tegner wrote:
> We are using an inexpensive D-link switch (DES-3225G), and are using
> channel bonding through two VLANS on that (one) switch. Really don't
> know what kind of improvement to expect, so I'm attaching two figures,
> the first one shows signature graphs (throughput as a function of
> time) using mpi and tcp with and without channel bonding (obtained by
> netpipe). From this one it looks like channel bonding is working OK.
> But when it comes to my application (simulation of a detonation in gas
> phase) improvement is not very spectacular (not worth it?). The figure
> shows the same case for three different meshes (480x50 cells to 1920x200
> cells), and displays the speed up as a function of number of nodes.
> Obviously I couldn't expect better scaling for the large case, but for
> the medium and the small one, are they showing the kind of improvement
> one could expect? Or is it likely that something is wrong with our
> Thanks in advance for any comments,
a) Do you know if your application is CPU bound or network bound?
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