Re: N-Dimensional array library submission...

From: rgarcia1771 (garcia_at_[hidden])
Date: 2001-12-26 11:42:49

--- In boost_at_y..., Toon Knapen <toon.knapen_at_s...> wrote:
> >  >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.
...
> 
> Sorry, vital info was missing : I used gcc-3.0.2 with option -O4.
> (gcc-2.95.3 won't compile multi_array).

Hello,

What problems were you having with gcc-2.95.3?  I am curious because 
I developed the library using that as my primary compiler (as well as 
KAI C++).  

As for performance testing, I havent done much more than what you did 
above.  As Beman had mentioned, the "abstraction penalty" of the 
compiler seems to be a significant issue where performance is 
concerned.  I have had some great preliminary success with KCC, but 
more investigation of this is necessary.

ron