From: lindahl@cs.virginia.edu (Greg Lindahl)
Newsgroups: comp.parallel.mpi
Subject: Re: Performance of overlapped communication and computation
Date: 29 Jan 1999 23:15:36 GMT
Organization: a guest of Shadow Island Games
Message-Id: <78tfeo$qsr@news3.newsguy.com>
References: <78sjcr$ath$1@lux.doc.ic.ac.uk>
Xref: ukc comp.parallel.mpi:4567


wjk@pluto.doc.ic.ac.uk (William Knottenbelt) writes:

> I had a quite a lengthy reply from Fujitsu today detailing why the
> AP3000 can't overlap communication and computation like the IBM SP-2
> does. The main problem seems to be the lack of direct user level
> access to the underlying network hardware (Solaris would have to be
> modified to allow this).

You can do this with just a device driver -- Myrinet, for example,
does this correctly on Slowaris.

-- greg