[Beowulf] multi-threading vs. MPI
arnoldg at ncsa.uiuc.edu
Wed Dec 12 09:37:57 EST 2007
> Debates and differences aside, often-times, this forum *is* an authoritative
> source of information.
Indeed it is.
By the way, we've got an old-ish course on multilevel
parallel programming at ci-tutor.ncsa.uiuc.edu in case anybody wants to go
there and see what people were thinking a couple years ago when they wrote
I've seen the benchmark speedups with mixed-mode as well. With the right
code, on a day with the wind to your back, threads can make good use of
communication induced idle time on a node [yeah MPI supports overlap...
that's more difficult to achieve than it would appear, requiring--
excellent programming, most excellent MPI implementation].
By the way, if you've used Intel's mkl, you may have run with hybrid code
already and not know it [do you know how your system sets OMP_NUM_THREADS
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