Rahul Nabar <rpna...@gmail.com> writes: > So, how does one go about selecting a good switch? "The most expensive > the better" is somewhat a unsatisfying option!
Also it's apparently not always right, if I recall correctly, according to the figures on MPI switch performance in the reports somewhere under http://www.cse.dl.ac.uk/disco.¹ The benchmark database there may also be relevant. I think they include OMPI figures, to bring this vaguely on topic. If you're concerned about latency -- which you may be for VASP? -- then the NICs and their settings are more important than the switch. (Obviously use Open-MX, not TCP, too.) See <http://www.nw-grid.ac.uk/LivMPI> for figures on the NICs I could test. I haven't seen better GigE ping-pong results than those, but would be interested to. --- ¹ Not whatever the currently-politically-correct URL is, but it still works (except if you turn off Javascript, sigh).
