[Beowulf] Performance characterising a HPC application
toon.knapen at fft.be
Mon Mar 19 09:20:21 EDT 2007
stephen mulcahy wrote:
> I'm still unsure what the bottleneck currently is. My hunch is that a
> faster interconnect *should* give a better performance but I'm not sure
> how to quantify that. Do others here running MPI jobs see big
> improvements in using Infiniband over Gigabit for MPI jobs or does it
> really depend on the characteristics of the MPI job? What
> characteristics should I be looking for?
Long time ago I was working with some guys who were using Dimemas
(http://www.cepba.upc.es/dimemas/). This tool allows you to simulate the
app on any network.
You first need to run the app once to collect a trace of all MPI-calls
that are performed during a run. Next, the tool allows you to simulate
your app (based on the trace to the MPI-calls) on any network (taking
into account how long the communication takes on the network you wanted
I can imagine this tool might be able to simulate your app on other
types of networks and investigate the speedup you might obtain.
disclaimer: I have no affiliation with the University of Barcelona.
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