Nvidia support

[msmaldi]

NVidia support.

Still running without nvidia cards without the functionality.

[hannesschulze]

Alright, thank you! Sorry for not being available last week. I'm going to merge this PR for now. There are a few problems I personally have. I think after these are fixed, this can also be merged into master:

• I think libXNVCtrl should be stored in another repo, because it changes the stats for the project (I believe GitHub showed that the majority was C code in your fork, which doesn't really represent Optimizer) and because it splits those two things up a bit
• I'll try to implement support for AMD and Intel GPUs myself because I have both available for testing
  • radeontop seems to show the correct usage for AMD cards (and it also works with the open source drivers), so this might help
  • intel_gpu_top (along with the lib) seems to be able to do the same thing for Intel

If you have any hints or suggestions, feel free to leave them here – I am not really experienced with this kind of hardware interaction.

[msmaldi]

I'm sorry for my english, I'm brazilian.

Can you run radeontop without root?

I think we need try a pseudo code...

include int main () { init_pci(params....);

collect(ticks, dumpinterval);

// result is declared in radeontop.h,
// This does not need to be atomic. A delay here is acceptable.

while(!results) usleep(16000);

// https://github.com/clbr/radeontop/blob/master/ui.c
float k = 1.0f / ticks / dumpinterval;

float gui = 100 results->gui k;

printright(2, hw, _("Graphics pipe %6.2f%%"), gui);

...

}