From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert HYATT Date: Mon, 13 Jul 1998 15:38:13 +0000 Subject: Re: Ultra AXmp Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ultralinux@vger.kernel.org On Mon, 13 Jul 1998, Matti Aarnio wrote: > One "spelling" error buggers me major way: > ... > > you are correct. If you take a high-end machine, like a Cray T90, over > > 50% of the total cost is the memory interconnection network, because it > > is so hard to provide almost a terrabyte of data/second spread over 32 > > cpus. :) > > There is no such multiplier prefix as "terra". The one you were > thinking about is "tera" (10**12 in Fortran notation). > That is the multiplier that is meant when "T" is used -- thus > "almoast a TB of data per second" (of course "TB" means something > else too, but that goes way beside the point.) sorry... I generally get "terabyte" correct. But I have been a science- fiction reader for 40 years, and read all the time, and "terra" is a natural screw-up for those of us so inclined. :) > > Although MicroSoft has a system called TerraServer(.microsoft.com), > they do use the intentional misspelling of the prefix to refer to > its size, although they also use the Latin "Terra" to mean "Earth" > to refer to its contents... > > > but the memory interconnect is always the sticky wicket on SMP machines, > > although for the PC, we simply dribble along at (now) 100mhz. :) > > Whatever systems we consider to buy/use, unless they are of commodity > type products, they will always cost way more than the commodity stuff. > Of course, nothing beats T90 in memory bandwidth per CPU :-) > > /Matti Aarnio >