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From: jonathan <johnscpg@googlemail.com>
Newsgroups: comp.lang.ada
Subject: Re: Need some light on using Ada or not
Date: Sun, 20 Feb 2011 07:45:33 -0800 (PST)
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Date: 2011-02-20T07:45:33-08:00
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On Feb 20, 2:34=A0pm, Brian Drummond <brian_drumm...@btconnect.com>
wrote:

> I removed virtually the entire body of the program into a single task.
> This change alone doubles the "CPU" time. There appears to be a 100% pena=
lty
> associated simply with running the original program from within a second =
task.


I noticed that too.  As soon as I declare a task, (you
don't have to use it for anything) then run-time doubles.

So as far as I can tell, anything with gnat tasks (p-threads)
has this behavior. The C program that uses p-threads (C#5)
has the same behavior.

The more successful multicore programs use OpenMP, which
uses fibers, or coroutine-like threads.

If you want a multi-core Ada version, this might be a good
place to break out the Annex E (distributed systems) approach.

The shootout runs on Ubuntu (Debian really). Now that polyorb
is part of the standard Debian distribution (Squeeze), an
Annex E solution based on polyorb might be possible.

http://packages.debian.org/sid/polyorb-servers

If any tasks are declared on the polyorb side of things,
then I would not be surprised if this fails, but otherwise
it would be nice to see an Annex E solution in public view.

There are other distributed-system candidates, but I don't
intend to do much until the benchmark rules are ... clarified.
I'll whine more about that in another post.

J.