[Beowulf] Re:

Geoff Jacobs gdjacobs at gmail.com
Mon Dec 17 15:40:22 EST 2007


G.M.Sigut wrote:
> On Sat, 2007-12-15 at 12:01 -0800, beowulf-request at beowulf.org wrote:
> ...
>>    2. Re: large array to run (Geoff Jacobs)
> ...
>> Message: 2
>> Date: Fri, 14 Dec 2007 21:46:42 -0600
>> From: Geoff Jacobs <gdjacobs at gmail.com>
>> Subject: Re: [Beowulf] large array to run
>> To: Craig Tierney <ctierney at hypermall.net>
>> Cc: beowulf at beowulf.org, Mark Hahn <hahn at mcmaster.ca>
> ...
>> Craig Tierney wrote:
>> <snippage />
> ...
>> IIRC, the CDC 6600 (and compatibles) had a 48 bit integer format as
>> default. So, yes it does vary. I guess I was rolling the dice a little.
> 
> My memory is telling me, that while the arithmetics on the 6000 series
> might have been done with 48 bits, the memory assignment was in words.
> One integer took one word of 60 bits (i.e. 5 bytes of 12 bits each).
> 
> George
> 

Right you are. 5 12 bit bytes. I was confusing with the FP coefficient.
Still weird, which was the whole point. Namely, more obscure examples of
hardware and software will have differences in data representation.

-- 
Geoffrey D. Jacobs

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