Date: Fri, 28 Jun 2002 10:19:21 -0700 From: Brooks Davis <brooks@one-eyed-alien.net> To: Gary Thorpe <gat7634@hotmail.com> Cc: brooks@one-eyed-alien.net, arch@FreeBSD.ORG Subject: Re: Larry McVoy's slides on cache coherent clusters Message-ID: <20020628101921.C26852@Odin.AC.HMC.Edu> In-Reply-To: <F43qR77bieLYCT4aJ6p00000244@hotmail.com>; from gat7634@hotmail.com on Fri, Jun 28, 2002 at 12:41:58AM -0400 References: <F43qR77bieLYCT4aJ6p00000244@hotmail.com>
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--H8ygTp4AXg6deix2 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Jun 28, 2002 at 12:41:58AM -0400, Gary Thorpe wrote: > >IIRC ASCI-Red (the first Teraflop supercomputer) actually runs > >on something like the CC model. It's made of dual CPU PII systems > >(actually, it started with PPros and was upgraded with those weird PPro > >form-factor PII Xeons) but acts something like a single system image. > >It's a bit more complicated then that since the service portion runs an > >OSF/1 derivative in a sort of single system image mode, but most nodes > >run a lightweight dedicated OS. >=20 > You mean like a microkernel? I have seen references to "cellular" computi= ng,=20 > where each node has its own microkernel to do low management for that nod= e=20 > and have all the nodes's microkernels cooperate to have a functioning=20 > system. Isn't this fundamentally different from how Linux/FreeBSD work? I'm actually not sure what the nodes run. I think it was called something like SunMOS. The idea is that since there is only one user per node, you don't want to waste cycles on things like memory protection if you can avoid it. The front end was UNIX from a user perspective, though I'm not sure if it was unix or microkernel underneath. My work was supposed to be writing tests for APIs, but mostly ended up being writing instructions on running the flakey hardware (it was supposed to be debugged by the windows people by the time we got it, but their project got cancled.) -- Brooks --=20 Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 --H8ygTp4AXg6deix2 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9HJqYXY6L6fI4GtQRAkpQAKCHEyrsSXiKbH/SdbvkZT/xQlmL5ACeKtHI quEEwE3b7eGfaJbQog6QMdg= =hHmA -----END PGP SIGNATURE----- --H8ygTp4AXg6deix2-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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