Disabling all access to graphics hardware

[Christian Uldall Pedersen]

Hello,

I am developing an embedded Linux system where I have multiple OpenGL 
applications running at the same time. Only one of the applications must 
be visible at a time, and so I unmap the windows of the other OpenGL 
applications. It does however seem like these applications are still 
slowing down the 3D performance of the visible application even though 
they are unmapped in X.org. (CPU and RAM usage is not an issue here.)

How can I make sure that these background applications do not impact the 
3D performance of the system?

Best regards,
Christian Uldall Pedersen