-------------- Original message --------------
From: Geoff Jacobs <[EMAIL PROTECTED]>
>
> But isn't CAF (and UPC, and Titanium) implicitly message passing for a
> Beowulf anyway? It's attractive because it simplifies the process and
> might be able to optimize communication, but underneath everything it's
> still message passing.
>
Most of what you say here is true ...
It is low-level message passing between nodes, and can be either within ...
depending
what optimizations the compiler does. Still, the code generated is one layer
closer to
the network adapter hardware and has a small potential performance advantage
because
of this (although MPI can be used as a conduit).
PGAS languages push the problem of managing latency off onto the compiler
while offering a more implicit, language integrated approach to dealing with
remote
references. The []s are light-weight symbols that remind the programmer of the
overhead implicit in make remote references, but the work of actual making them
effecient is left up to the compiler.
rbw
--
"Making predictions is hard, especially about the future."
Niels Bohr
--
Richard Walsh
Thrashing River Consulting--
5605 Alameda St.
Shoreview, MN 55126
Phone #: 612-382-4620
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