Benefit of Compiz to audio work?

Christian Höltje docwhat+list.ubuntu.devel.discuss at
Tue Nov 13 12:35:16 UTC 2007

* Cory K. (coryisatm at [071112 10:26]:
> The Ubuntu Studio team is considering shipping Compiz (with a
> minimal config) in Ubuntu Studio-Hardy 8.08.
> Some have said that moving the drawing of windows off the the GFX
> card would help the load on the CPU and thus keep xruns to a
> minimum.
> Any thoughts/ideas on this one?

One of the major advantages to drawing windows on GL rectangles is
that they never need to be redrawn because they cannot be obscured.

With 2d window managers, when a window is moved off another window,
the previous obscured window must redraw which can suck a lot of IO
and CPU (depending on the application).

There are some other potential costs, depending on the video card, but
turning off all the extras in Compiz and making sure it's ionice value
is lower than your audio apps would probably be better than most 2d
window managers.

It's an interesting idea for a window manager, though... a 3d super
low CPU/IO window manager doing as much as possible in the GPU.


When sorrows come, they come not single spies, but in batallions.
	-- Shakespeare, Hamlet, IV:iv

The Doctor What: Hoopy Frood           
docwhat *at* gerf *dot* org                                        KF6VNC
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