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Newsgroups: comp.lang.ada,comp.realtime,comp.software-eng
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
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From: Ludovic Brenta <ludovic.brenta@insalien.org>
Date: Wed, 09 Mar 2005 23:34:48 +0100
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Xref: g2news1.google.com comp.lang.ada:8980 comp.realtime:1156
 comp.software-eng:4715
Date: 2005-03-09T23:34:29+01:00
List-Id: <comp.lang.ada>

Pascal Obry writes:
> compiled for the C code using:
>
> $ gcc -o c_matrix -O2 matrix.c
>
> compiled for the Ada code using:
>
> $ gnatmake -f -O2 -gnatp matrix.adb -bargs -static
>
> (-bargs -static to use the static runtime, this is what C does in this case).
>
> I get:
>
> $ time matrix 100
>  270165 1061760 1453695 1856025
>
> real    0m0.033s
> user    0m0.010s
> sys     0m0.020s
>
> $ time c_matrix 100
> 270165 1061760 1453695 1856025
>
> real    0m0.033s
> user    0m0.010s
> sys     0m0.010s
>
> I see identical results here, this is on a Windows box using GCC 3.4.4
> and GNAT 5.03a. Of course this is no surprise since GNAT share the very same
> backend! Yet this means just nothing. A good benchmark is done on real
> applications. At least I hope it will dismiss the idea that Ada is inherently
> slow. There is nothing in Ada that is designed to be slow, a good compiler for
> Ada as a good compiler for any language should generate good code, that's all.

Out of curiosity, could you try with:

gnatmake -O2 -gnatVa -gnato matrix.adb

and see if, with all checks turned on, there is a significant difference?

-- 
Ludovic Brenta.