[Beowulf] programming multicore clusters
lindahl at pbm.com
Fri Jun 15 14:46:43 EDT 2007
On Fri, Jun 15, 2007 at 01:49:49PM +0200, Toon Knapen wrote:
> AFAICT this is not always the case. E.g. on systems with glibc, this
> functionality (set_process_affinity and such) is only available starting
> from libc-2.3.4.
Nearly every statement about Linux is untrue at some point in the
> E.g. you can obtain a big boost when running an
> MPI-code where each process performs local dgemm's for instance by using
> an OpenMP'd dgemm implementation. This is an example where running
> mixed-mode makes a lot of sense.
First off, I see people using *threaded* DGEMM, not OpenMP. Second,
I've never seen anyone show an actual benefit -- can you name an
example? i.e. "for N=foo, I get a 13% speedup on..."
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