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From: "jimmaureenrogers@worldnet.att.net" <jimmaureenrogers@worldnet.att.net>
Newsgroups: comp.lang.ada,comp.realtime
Subject: Re: 10 rules for benchmarking (was Re: Teaching new tricks to an old
 dog (C++ -->Ada))
Date: 12 Mar 2005 04:54:28 -0800
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Date: 2005-03-12T04:54:28-08:00
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CTips wrote:
> Jim Rogers wrote:
> >
> >
> > I have created another version and downloaded the latest cygwin to
> > try to make the system as similar as possible. I have translated
your
> > example into Ada for another increase in similarity.
> >
> > compiled with -gnatwu -gnato -I
> >
> > Using the cygwin time command I got  a total run-time of 2.1s.
> > With -O2 I get 1.1s
> >
> > My speed appears to be very similar to yours.
>
> Good!
>
> Did you run the C code as well by any chance?
>
> BTW: the numbers *should* be the pretty close to identical. The
> algorithms are the same, Ada does not need to kick in any of its
> run-time checks, and the two backends are the same.
>
> About the only room for difference is if the two flags (-O2) kick off

> different sets of optimizations for Ada and C.

One other small difference is that GNAT 3.15p uses a much older
version of the gcc backend. That, along with the differences in
cpus, may easily account for differences.

Jim Rogers