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Newsgroups: comp.lang.ada
Date: Wed, 28 Mar 2018 13:17:43 -0700 (PDT)
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Subject: Re: Large number of tasks slows down my program (using debian) - any
 fix?
From: reinert <reinkor@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:51245
Date: 2018-03-28T13:17:43-07:00
List-Id: <comp.lang.ada>

Seems like "active components/objects" is not so simple as I hoped for.

Sometimes it seems active objects facilitate "effective (natural) representation". But there seems to be restrictions :-)

reinert


On Wednesday, March 28, 2018 at 9:21:14 PM UTC+2, Dmitry A. Kazakov wrote:
> On 2018-03-28 20:06, reinert wrote:
> 
> > I use gnat on debian (latest version). Now I tried to initiate a large number of (access) tasks ( "t := new atask_type" ). When I try to start, say, 500 tasks, my program slows down whithout any apparent reason (before the tasks do anything).
> 
> 500 tasks is way too many.
> 
> > Any hope for a quick fix?
> 
> Unlikely. Re-design: use a pool of working tasks, queue jobs to them. 
> Use state machines instead of active objects. Switch from blocking I/O, 
> to asynchronous/overlapped I/O. Use select socket instead of blocking 
> sockets etc.
> 
> P.S. co-routines/passive tasks is a way to migrate from the craziness 
> you have to a reasonable design without complete re-design.
> 
> -- 
> Regards,
> Dmitry A. Kazakov
> http://www.dmitry-kazakov.de