Author: Robert Hyatt
Date: 07:48:02 07/07/03
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On July 05, 2003 at 23:37:47, Jay Urbanski wrote: >On July 04, 2003 at 23:33:46, Robert Hyatt wrote: > ><snip> >>"way better than MPI". Both use TCP/IP, just like PVM. Except that MPI/OpenMP >>is designed for homogeneous clusters while PVM works with heterogeneous mixes. >>But for any of the above, the latency is caused by TCP/IP, _not_ the particular >>library being used. > >With latency a concern I don't know why you'd use TCP/IP as the transport for >MPI when there are much faster ones available. > >Even VIA over Ethernet would be an improvement. I use VIA over ethernet, and VIA over a cLAN giganet switch as well. The cLAN hardware produces .5usec latench which is about 1000X better than any TCP/IP-ethernet implementation. However, ethernet will never touch good hardware like the cLAN stuff. MPI/PVM use ethernet - tcp/ip for one obvious reason: "portability" and "availability". :)
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