compile for cpu instead of gpu?

Hello! I'm a somewhat experienced linux user, dedicated to help a friend to squeeze most performance out of available hardware.

Why is the GPU used for EMC2s calculations? GPU and video memory is hard to monitor and control under Linux. My two processors are using both between 4 and 10 percent when running EMC2. Yet, the video card gets hot when doing its math.

Could it be desirable to run this application on a CPU?

Is there any way to compile the package to use 'normal' CPUs (a dedicated one, and/or both)?

Thanks.

GPU is not used at all by EMC.
It gets hot since power managment is not enabled for GPU - it's either working bad (open source ati drivers) or missing (using vesa driver)
Closed blob drivers (nvidia or fglrx) are causing problems so generaly they are not used.