Re: MPI octave with hyperthreading

[Michael Creel]

With regard to Javier's message, my experience with a 2 way Xeon SMP 
machine is that it in fact works quite well. The example programs in my 
paper at http://econpapers.repec.org/paper/aubautbar/637.05.htm 
(forthcoming in Computational Economics) run about twice as fast on the 
SMP machine lambooting 2 nodes. Note that these results are not in the 
paper, there I only report results for a cluster. In fact, enabling HT 
and lambooting 4 nodes often gives a better than 2X speedup. But the 
example programs I used exhibit data parallelism, so probably memory 
contention  is not a big problem with them.  The LAM/MPI documentation 
claims that it should work fine with SMP, and in my limited experience, 
this is true. The parallelknoppix CD has the example problems from my 
paper, as well as the Pi example in MPITB  installed and ready to run, 
if anyone would like to do additional experimentation.



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