> > I eliminated skips due to CPU and disk using
> > nice and -cache 8000. I still can make it skip
> > when my KDE background picture is changing.
> >
>
> I also must run mplayer at nice -20 for it to be usable.
>
> > I think that these skips are caused by the X server.
> > It has no prioritization for request handling and
> > thus it does not paint mplayer output fast enough:
> > it needs to repaint background and semi-transparent
> > konsole(s), and that is taking a few seconds at least.
> >
> > This is probably aggravated by serializing nature of Xlib,
> > according to:
> >
> > http://en.wikipedia.org/wiki/XLib
> > http://en.wikipedia.org/wiki/XCB
>
> I think the problem is also due to mplayer's faulty design. It should
> be multithreaded and use RT threads for the time sensitive work, like
> all professional AV applications and many other consumer players do.
RT - yes, multithreaded - unsure. Witness how squid manages to
serve hundreds of simultaneous streams using just a single process.
Multithreading seems cool on the first glance and it is easier to code
than clever O_NONBLOCK/select/poll/etc stuff. However,
on single-CPU boxes, which are still a majority, multithreading
just incurs context switching penalty. It cannot magically
make CPU do more work in a unit of time.
--
vda
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