[GEM-dev] best strategy to run two screens from one box

[cyrille henry]

Roman Haefeli a écrit :
> hi all
> 
> i'd like to drive two screens in fullscreen mode with puredata/gem and
> wonder, which is the best way to go performance-wise.
> 
> the setup, that i'm working with:
> - ubuntu jaunty
> - pd-extended-41.4
> - nvidia geforce 9800gt with two heads (if i recall correctly, can't
> check at the moment)
> - two monitors with different resolutions (1280x768 and 1280x1024)
> 
> so far, i came up with having two separate X screens, so that i can tell
> [gemwin] with a 'create <screen-id>' message, on which screen to open.
> this requires two instances of pd/gem, of course.
> 
> i wonder now, if it makes a difference performance-wise, when having
> only one gem window, that spans both screens.

well, if you have a dual core computer, then 2 pd would help using your 2 core.

if you have to display the same geometry on the 2 screen in a way that you can send less information in the GPU then, it could help to have only 1 windows.

anyway, best is to make benchmark...

> however, when switching to
> 'twinview(tm)' mode, so that i have one big desktop spanning both
> screens, i still cannot make the gemwin bigger than the size of the
> screen, where it initially was displayed. is this because the do not
> have the same resolution?
did you try with border 0?
otherwise, your gemwin is certainly resized by you windows manager.

> 
> it seems to actually work ok with the current setup, but i am curios,
> what strategy other people followed, when trying to drive more then one
> video output with gem.

if possible, using many computer certainly help for performance.
if performance is not a problem, then a dualhead2go from matrox help to drive 2 screen from 1 VGA/DVI output.

Cyrille

> 
> roman
> 
> 
> 
> 
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