From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,53a571639ed0bc5a
X-Google-Attributes: gid103376,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news4.google.com!feeder3.cambrium.nl!feeder1.cambrium.nl!feeder6.cambrium.nl!feed.tweaknews.nl!news.astraweb.com!border2.a.newsrouter.astraweb.com!newsfeed101.telia.com!nf02.dk.telia.net!news.tele.dk!feed118.news.tele.dk!not-for-mail
Date: Fri, 10 Aug 2007 16:59:45 +0200
From: Poul-Erik Andreasen <poulerik@pea.dk>
User-Agent: Icedove 1.5.0.12 (X11/20070607)
MIME-Version: 1.0
Newsgroups: comp.lang.ada
Subject: Re: Dynamic functions
References: <46bb3919$0$19890$edfadb0f@dread11.news.tele.dk>
 <ygemywz3mm6.fsf@hugsarin.dmusyd.edu>
 <6sdjo0lxt0xs.1ep1p45e58zk2$.dlg@40tude.net>
In-Reply-To: <6sdjo0lxt0xs.1ep1p45e58zk2$.dlg@40tude.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Message-ID: <46bc7afa$0$172$edfadb0f@dread11.news.tele.dk>
Organization: TDC Totalloesninger
NNTP-Posting-Host: 80.166.145.174
X-Trace: 1186757371 dread11.news.tele.dk 172 80.166.145.174:11849
X-Complaints-To: abuse@post.tele.dk
Xref: g2news2.google.com comp.lang.ada:1388
Date: 2007-08-10T16:59:45+02:00
List-Id: <comp.lang.ada>

Dmitry A. Kazakov wrote:
> On Fri, 10 Aug 2007 08:54:57 +0200, in comp.lang.ada you wrote:
> 
>> Poul-Erik Andreasen wrote:
>>
>>> How is the best way to make a representation of a function/algorithm
>>> wich can bee setup at runtime in Ada.
>> Is there any reason that you cannot convert the function to Ada, write
>> it to a file, compile it to a plug-in/DLL/shared library, and then
>> load the plug-in/DLL/shared library?
> 
> Yup, this is how MatLab and many other similar languages do, if you really
> need to *program* (as opposed to draw (:-))  something...
>  
>> The complication is that it requires an Ada compiler on the running
>> system, but the benefit is pretty fast execution.
> 
> ?
> 
> Execution includes elaboration of the code. In your case elaboration would
> mean to call the compiler, to link the DLL, to load the DLL. How frequent
> the given function F will be called per run? If you are not going to design
> some image rendering/processing system with millions of calls per function,
> it probably will not pay off.

In my case wee are in fact talking about  several million calls per 
function. Jacob have bee proposing this model to me before, but i find i 
a bit to cumbersome. By the way it is not images it is timeseries

> Other potential issues:
> 
> 1. You will need a lot of free system resources to be able to run the
> compiler/linker in parallel to your program, free memory and disk space.
> 
> 2. The response time (from request to execute F to its start) will be
> awful.
> 
> 3. You will need to manage files (lots of) and other environmental stuff.
> Deployment, integration etc might turn difficult.

This is my main issue
> 
> 4. DLL interface does not know Ada. Exporting complex data types and
> objects of from a dynamically loaded DLL could be difficult.
> 
> 5. DLL handling stuff is non-portable.
> 
This could also become an issue.