01-20-2013, 07:49 AM
Further, within a display, the ".X" suffix will specify a specific screen/device.
So, DISPLAY=:0 usually means "The GPUs in the system."
DISPLAY=:0.0 means "The first configured screen/GPU" - I think it's actually screen, but with one screen configured per card, it's the same.
DISPLAY=:0.1 means "The second configured screen/GPU."
That can be used to address specific cards.
However, none of it *should* be relevant to compute. It's because AMD hacked up a truly odd way to address their cards.
So, DISPLAY=:0 usually means "The GPUs in the system."
DISPLAY=:0.0 means "The first configured screen/GPU" - I think it's actually screen, but with one screen configured per card, it's the same.
DISPLAY=:0.1 means "The second configured screen/GPU."
That can be used to address specific cards.
However, none of it *should* be relevant to compute. It's because AMD hacked up a truly odd way to address their cards.