Re: [boost] Re: N-Dimensional array library submission...

From: Toon Knapen (toon.knapen_at_[hidden])
Date: 2001-12-21 08:25:58

Beman Dawes wrote:

> At 03:42 AM 12/21/2001, tknapen wrote:
> 
>  >--- In boost_at_y..., Ron Garcia <garcia_at_c...> wrote:
>  >> Hi,
>  >>
>  >> I have uploaded a library called multi_array to the files directory.
>  >
>  >2 questions:
>  >
>  >1) performance
>  >Have you measered performance compared to plain C-arrays ?
>  >I just wrote a small test in 2 minutes and have some strange results.
>  >The C-array indexing takes 0.9 seconds where-as the multi-array takes
>  >2.92 seconds. (see below for small test program). Can this be due to
>  >the []-indexing.
> 
> Just out of curiosity, was this a debug or an optimized build?
> 
> Do you know if the compiler involved normally has a low abstraction 
> penalty?

Sorry, vital info was missing : I used gcc-3.0.2 with option -O4.
(gcc-2.95.3 won't compile multi_array).