Date: Fri, 28 Jun 2002 00:41:58 -0400 From: "Gary Thorpe" <gat7634@hotmail.com> To: brooks@one-eyed-alien.net Cc: arch@freebsd.org Subject: Re: Larry McVoy's slides on cache coherent clusters Message-ID: <F43qR77bieLYCT4aJ6p00000244@hotmail.com>
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>From: Brooks Davis <brooks@one-eyed-alien.net> >To: Terry Lambert <tlambert2@mindspring.com> >CC: Jonathan Lemon <jlemon@flugsvamp.com>,Julian Elischer ><julian@elischer.org>,"Greg 'groggy' Lehey" <grog@FreeBSD.ORG>, >arch@FreeBSD.ORG >Subject: Re: Larry McVoy's slides on cache coherent clusters >Date: Thu, 27 Jun 2002 15:26:16 -0700 > [...] > > The 65,536 processor machine that Good Year built for modelling > > laminar airflow on the full shuttle airframe was purpose built > > hardware with a seperation of 2. So were most of the Connection > > Machine series from Thinking Machines, Inc.. > >For things you can actually buy, anything over 2 CPUs from SGI falls into >this catagory (and many of the dual CPU systems are actually unconnected >dual nodes from larger systems.) Which is how redundancy *can* be implemented in a NUMA machine. Since nothing is centralized (no main cpu or memory bus to share), it should be possible to make the system more easily resistant to hardware failure. > >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. You mean like a microkernel? I have seen references to "cellular" computing, where each node has its own microkernel to do low management for that node and have all the nodes's microkernels cooperate to have a functioning system. Isn't this fundamentally different from how Linux/FreeBSD work? _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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