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Date:      Tue, 18 Aug 1998 15:21:50 -0700 (MST)
From:      "Russell L. Carter" <rcarter@pinyon.org>
To:        ghelmer@scl.ameslab.gov, Matthew.Alton@anheuser-busch.com
Cc:        Hackers@FreeBSD.ORG
Subject:   Re: DIY Supercomputers
Message-ID:  <199808182221.PAA14610@vip.consys.com>
In-Reply-To: <Pine.SGI.3.96.980818145941.20758D-100000@demios.scl.ameslab.gov>

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|The biggest objection I've heard to using FreeBSD for parallel processing
|clusters was the lack of a FreeBSD version of a certain commercial Fortran
|compiler.  FreeBSD (with net.inet.tcp.delack_enabled=0 in 3.0-current) 
|ought to have better network performance over the entire spectrum of
|message sizes than Linux 2.0.x, so I want to see whether this has an
|observable effect on parallel apps.

The NAS Parallel Benchmarks are quite network intensive, there may
be numbers for "Beowulf" clusters by now.  There weren't when I
was running on the DAISy cluster at Sandia (which ran FreeBSD
at the time, '94-95).  The DAISy numbers I measured for these
were the best price/performance of *any* system at the time.


Russell

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