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Subject: Re: The need to unmake move

Author: Robert Hyatt

Date: 12:03:00 09/03/03

Go up one level in this thread


On September 03, 2003 at 14:20:51, Gian-Carlo Pascutto wrote:

>On September 03, 2003 at 14:02:44, Robert Hyatt wrote:
>
>>I assume he was talking about going from 2 to 4 giving zero.  :)
>>
>>However, the example was real.  In 1983 ...
>                                    ^^^^
>                                    IIII
>
>Emphasis placed.
>
>If you manage to get at least 1.5 average speedup, in a modern
>program, by only splitting the root, your program has SOME VERY SERIOUS
>ISSUES.
>

Why?

Spliting at the root _will_ produce a speedup.  The theoretical proof
is not hard to understand.  Whether it is 1.5 or 1.3 is irrelevant.  Vincent
said "it can't be done in under a year."  Splitting at the root is a _trivial_
algorithm to implement.  It _will_ produce a speedup.  Hence (again) his
statement is wrong.

That was the point, not whether the actual number is 1.5 or even 1.01.  He
said "less than 1.0"




>--
>GCP



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