mcguire at neurotica.com
Tue May 6 13:45:23 CDT 2003
On Tuesday, May 6, 2003, at 12:16 PM, Jochen Kunz wrote:
>> When I can afford to run the Cray,
> How much does it eat?
The J90 pulls about 5.5kW. That's usually doable, but I'm on a
startup company salary. My normal power bill here is about $450/mo,
running the J90 would push that up to over $1K.
>> well, I think we all know where the FP stuff goes,
> ... if you can vectorize it...
Yes, very true. It's pretty respectable with pure scalar ops too,
though; it's got great memory bandwidth and stupid-fast disk I/O.
>> as long as it doesn't require IEEE FP.
> Crays don't do IEEE FP? Why? Historical reasons? (AFAIK the Cray 1
> predates IEEE FP like VAX.)
Newer ones do. Yes, the Cray 1 predates IEEE, but most later
machines weren't based on the Cray 1 architecture. There was the X/MP
family, the Cray-2, -3, and -4, but pretty much everything else is YMP
architecture, including the J90. If memory serves, the T90 does both
formats, as do the SV machines...my memory is getting really fuzzy, the
SV machines might be IEEE-only. I don't have much information on
them...it'll be many, many years before they become affordable. :)
Dave McGuire "She's a cheek pincher. I have scars."
St. Petersburg, FL -Gary Nichols
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