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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: GNAT (GCC) Profile Guided Compilation
Date: Fri, 29 Jun 2012 11:48:10 +0100
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Date: 2012-06-29T11:48:10+01:00
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Keean Schupke <keean.schupke@googlemail.com> writes:

> I am developing a Monte-Carlo simulation engine, and I have
> implementations in C++ and Ada. All performance figures come from the
> same reference hardware. Both are built using GCC, and similar
> optimisation is applied to each (same optimisation level, cpu arch,
> inlining etc).
>
> My C++ implementation achieves 40,000 simulations per second.
>
> My Ada port initially achieves 32,000 iterations per second.
>
> I refactored the Ada port to use System.Address to access the main
> data structure (as in the 'C++' version benchmarking showed a clear
> performance benefit to *ptr_x compared to array[x])
>
> The Ada port using System.Address achieves 40,000 simulations per
> second - so this is looking good.

Did you try -gnatp (suppress all checks)? (only to be used when you're
sure the code is correct!)

You could also use pragma Suppress at the hot spots.