Le 2012-02-14 à 11:14:00, Charles Henry a écrit :
On 2/13/12, Mathieu Bouchard <ma...@artengine.ca> wrote:
Do you understand what I say, or you just repeat what I was replying to ?
I thought I understood--was there something I missed?
I wouldn't have known that from your reply. It seemed to just continue
where you had left. When I want to just add more to something I said, I
just reply to my own mail. I don't quote someone's mail to say something
completely unrelated to the quote.
The point of the original remark is that you always lose some of your
potential computing power when trying to use multiple resources.
Part of the computing power has to be put on communication and
coordination, which are essential parts of collaboration. It doesn't
necessarily mean that those ressources could have been used for anything
else. If you measure a programme's computing time without counting its
I/O, it'll appear more efficient than if you counted the I/O. For
multi-processor computing involving divide-and-conquer or pipelining, some
of the work internal to the algorithm is I/O and you can't avoid measuring
it. This might skew perception a bit.
You contrast with the capability of parallel computing to accomplish a
certain amount of work in less time. I don't want to argue with
you--these are just the two sides of the coin.
Yes, I was stating the other side, because there hadn't been any
clarifications on what « the sum » and « the parts » ought to be in that
case. People compare total amounts of gigaflops because they can, and
because it's fairly simple to measure a score to determine a winner,
which leads to competitions that take a lot of time and effort. This
orients a lot of the default thinking about what is « the » goal of
parallelism.
I had actually typed out and then deleted some more things
I also do that a lot. If I had kept them, I could make a book out of them,
and store it in a random position in the Library of Babel.
about a successful project that accelerated computing time from weeks to
hours, but I thought they were boring.
If you want to post it, post it, and if you don't want to, don't.
______________________________________________________________________
| Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC
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