[rescue] Cheapest Cray?

Dave McGuire mcguire at neurotica.com
Mon Apr 26 12:57:55 CDT 2004

On Apr 26, 2004, at 1:04 PM, Charles Shannon Hendrix wrote:
>>   In some cases, yes.  The machines have backplanes, and CPU & memory
>> modules fit into slots.  You can snag those modules (be they boards
>> like in the EL or big metal "subchassis" like in the J90) from one
>> machine to put 'em in the other.  That's what I did with a J90 that I
>> bought a couple of years ago...used it to expand my existing one and
>> have some spare power supplies, backplane, and rack components.  I
>> don't like buying vendor maintenance contracts. :)
> What do you do with your J90?

   Well, as I've mentioned several times, absolutely nothing right 
now...it's powered off until my income increases to something more 

   When I was running it 24x7 (which I did for about a year and a half), 
I used it for  teach myself about vector processing and how to write 
code for vector processors, to learn about the Cray compilers, and to 
learn how to run the machine from a sysadmin point of view (a typical 
supercomputer doesn't exactly print an Award BIOS copyright message, 
count up it's memory, and boot when you turn it on).

   When I became comfortable with the use of the machine, I used it to 
prototype the image processing algorithms used in a commercial digital 
video security/motion detection system I developed.

   I also worked on a project with a friend of mine to write a 
pseudo-vectorized implementation of the RC5 algorithm (back with the 
bovine.net RC5 contest was relevant), and while we got most of the way 
there, it was never finished.


Dave McGuire          "PC users only know two 'solutions'...
Cape Coral, FL          reboot and upgrade."    -Jonathan Patschke

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