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From: John McCormick <mccormick@cs.uni.edu>
Newsgroups: comp.lang.ada
Subject: Re: Real Time IO routines
Date: Sat, 27 Oct 2007 05:40:31 -0700
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On Oct 26, 4:14 pm, andrew <andrew.carr...@okstate.edu> wrote:
>
>
> start := clock;
> --I run my algorithm here
> finish := clock;
> ada.Text_IO.put_line("time = " & duration'image(to_duration(finish -
> start)));
>
> the output is always time = 0.000000000.  I know it had to take some
> time because it takes about 10 seconds for the program to reach that
> point in the code.  Overflow maybe?

For years I used the identical logic in an exercise in plotting
running times for various sorting algortihms in a unit on Big-O.  It
worked fine for the old GNAT (Ada 95).  Last year when I recompiled it
with GNAT GPL, I got the same results as you - all times gave zero.
When I added a delay 10.0, it worked as Adam reported.  I meant to
submit a bug report, but never got around to writing it up.  I haven't
tried it with the latest GPL version.

John