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Subject: Re: More on the "bad math" after an important email...

Author: Robert Hyatt

Date: 09:49:44 09/04/02

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On September 04, 2002 at 12:06:05, Tony Werten wrote:

>On September 04, 2002 at 11:47:39, Tony Werten wrote:
>
>>On September 04, 2002 at 10:33:41, Robert Hyatt wrote:
>>
>>>On September 04, 2002 at 03:31:19, Tony Werten wrote:
>>>
>>>>On September 03, 2002 at 18:03:14, Gian-Carlo Pascutto wrote:
>>>>
>>>>>However reasonable your explanations may be, the gist of your DTS article
>>>>>and the most important thing for comparison were the speedup numbers. After
>>>>>what we discovered and what you just posted, it is clear that they are
>>>>>based on very shaky foundations.
>>>>
>>>>I must be missing something. The only thing I see wrong with the speedup numbers
>>>>is the way they are calculated.
>>>>
>>>>Since time was measured in miliseconds ie 3 significant numbers after the dot,
>>>>the speedup should have been given in 3 significant numbers behind the dot as
>>>>well.
>>>
>>>
>>>
>>>Just a note.  I am not sure where this "millisecond" stuff comes from.  But in
>>>Cray Blitz, we only kept time to the nearest second, as produced by the Cray
>>>library system call.
>>
>>So the speedup was calculated a different way and from that speedup the
>>solutiontime was calculated. Unfortunately the solutiontime was in
>>milliseconds,suggesting a high precision and the speedup factor only in tenths
>>giving the strang looking "precision" of 2.000 or 1.900 for anyone calculating
>>it the normal way from the tables.
>>
>>OK at least I understand what it's all about now. Not sure if I care though.
>
>
>What I mean ( haven't read the paper yet ) is that I'm not sure if there is a
>difference between measuring the searchtimes and calculating the speedup and
>measuring the speedup and calculating the searchtimes.
>
>As long as the measuring is done correctly.
>
>Tony
>

that would be my point also.  Ditto for nodes.



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