Re: implemented features (Re: Decision time....)

["km b" <kmb810@xxxxxxxxx>]

On 6/6/07, Erik Wikström <erik-wikstrom@telia.com> wrote:

> The place where he found the 50 % performance increase is indicated
> right in the text you quoted, in *his* binaries compiled from *his*
> code. He also did mention that this seemed to be true for *some* parts
> of the GSL, not all of it. So unless you can get hold of the same
> program as he is talking about and showing that there's no difference
> between 64-bit and 32-bit machines then there's nothing you can do to
> prove him wrong.

Rahul is a theoritical physicist and I am asking him to compare
oranges vs oranges and not apple vs oranges to back his claims.

AS for 32-bit machine vs 64-bit machines , there may be a massive
performance increase.
However on the same 64-bit machine, in two different execution
environments you won't see a massive performance shift as Rahul is
claiming. You can see some of the extensive benchmarking results at
http://www.fftw.org/benchfft/.


> Regarding your tests I find it hard to put any faith into number derived
> from running different tests (32 vs. 64 bits) on different machines (is
> it even the same hardware?). By the way, the files you sent were not
> PDFs, but PS-files (took me a while to figure that one out).

Read my mail. Same machine, same hardware, different execution
environments. I am comparing oranges vs oranges not oranges vs apples
to back my results.

Have fun

cheers
kmb

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