On Tue, Nov 21, 2006 at 09:01:53PM +0100, Dominic Sacré wrote:
> On Tuesday 21 November 2006 18:50, Fons Adriaensen wrote:
>
> > It comsumes a lot of CPU if you use many channels.
> > On my 2 Ghz P4, 16 channels take 94%. Almost all of this
> > is taken by X11, which indicates that there's something
> > strange.
>
> I assume you're using SDL. If you can, try OpenGL, that should take most
> of the work off the CPU.
Rather the opposite, see below.
> Another thing you could try is to change both occurences of SDL_HWSURFACE
> in video.h to SDL_SWSURFACE. Does it make any difference? On my machine
> it doesn't, so I wasn't sure what to use.
It does help a bit, but not with -g:
| -g
---------------------
HW | 33% 94%
SW | 22% 93%
> Also note that currently, even in non-scrolling mode, jack_oscrolloscope
> redraws the whole window on every frame, because was easier to implement.
> Changing that is somewhere on my todo list :)
Probably something you should do. I've got an almost identical app
(Yass - not yet released). With 100 updates per second, 32 channels,
and the maximum scrolling speed it takes less than 1% of available CPU.
So it's definitely not X11 taking all the time.
--
FA
Lascia la spina, cogli la rosa.
