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From: =?ISO-8859-1?Q?Hibou57_=28Yannick_Duch=EAne=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Start a Windows process and get its text output
Date: Sun, 7 Feb 2010 12:35:17 -0800 (PST)
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Date: 2010-02-07T12:35:17-08:00
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On 7 f=E9v, 20:24, Hibou57 (Yannick Duch=EAne) <yannick_duch...@yahoo.fr>
wrote:
> I was wondering about the cost of threads on Windows, as GNAT create
> Ada task as Windows thread (I suppose its the same for Janus and
> others, I hope to be honest).
> [...]
>
> The sole words about it in the MS reference says :
For any interested parties, I've found an answer which seems
reasonable here :
http://stackoverflow.com/questions/304752/how-to-estimate-the-thread-contex=
t-switching-overhead

Two interesting quotes are:

> Oh, and I remember an application running on Windows CE 4.X, where
> we also have four threads with intensive switching at times, and
> never ran into performance issues.

and

> Output
> Number of thread switches in about one second was 108406
> Over 100'000 is not too bad and that even though we have locking and
> conditional waits. I'd guess without all this stuff at least twice
> as many thread switches were possible a second.

Threads does not cost so much after all (keep in mind this was on
architecture with support for Windows, this is Windows specific).