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List:       kde-multimedia
Subject:    Re: [PATCH] artsd periodic cpu usage check
From:       Martin Vogt <mvogt () rhrk ! uni-kl ! de>
Date:       2000-09-06 16:16:49
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On Wed, Sep 06, 2000 at 02:05:30PM +0200, Stefan Westerfeld wrote:
>    Hi!
> 
> On Tue, Sep 05, 2000 at 05:30:50PM +0200, Martin Vogt wrote:
> > On Mon, Sep 04, 2000 at 10:28:52AM +0200, Stefan Westerfeld wrote:
> > > This patch adresses this issue by periodically (setitimer()) self-checking
> > > the CPU usage of the artsd process (clocks()), and if it is over 90% for
> > > more than 15 seconds, terminating artsd (exit()). I think with this patch
> > > applied, running artsd all the time with realtime rights on some millions
> > > of KDE desktops shouldn't lead to a single freeze.
> > >
> > 
> > But it can lead to an exit(1) when you dont like it either.
> > If the user plays a divx movie (with the divxplugin) the cpu will have
> > a 100% load all the time. (At least on high resolutions
> > on not so fast cpus.)
> 
> It wouldn't occur while viewing divx movies, as it only measures the CPU
> usage of the artsd process (and not the spawned threads), and as mpeglib
> is threaded. Moreover you'll also have time spent in the X11 server when
> you are really watching a movie, so that the CPU usage distribution (for
> divx) should be something like:
>

Ahh. Fine.

But if you ha`e systems which do not make an entry in the process
table for a thread, but use one entry for all threads...
This is true for all non Linux systems.
{mpeglib is not build on these systems, so I ha`e no problem
with that}

Martin
 
 
>  * X11                       30%
>  * artsd main process        10%
>  * mpeglib input read thread  5%
>  * mpeglib rendering thread  25%
>  * mpeglib divx decoding     30%
> 
> which wouldn't lead to a lockup (since the artsd main process hasn't 100%,
> and this is the only process with realtime rights), and not to an exit(1),
> since the artsd main process stays under 90%.
> 
>    Cu... Stefan
> -- 
>   -* Stefan Westerfeld, stefan@space.twc.de (PGP!), Hamburg/Germany
>      KDE Developer, project infos at http://space.twc.de/~stefan/kde *-         
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