Change Device Order Change default GPU

Accelerated Computing CUDA CUDA Programming and Performance
1

Hello,

I am working with a multi-gpu system. It has a Tesla c2070 and two GTX 570s. My problem is, the programs my lab uses all use the default gpu. (Device 0) Which would be fine if the device 0 was the tesla card, but it is not.

I have the Tesla card plugged into bus 1 and the two GTX cards in 7 and 8. I tried physically swapping them and it made no difference in order. I even tried swapping them in the xorg.conf file.

Any idea how I can change the devices around? Or bet set the default device on the fly?

Thank you,

Matthew Caylor
Department of Chemistry and Biochemistry, BSU.

2

Drives or cards?

3

Typo, devices. As in video cards.

4

Either that or how to tell which device maps to which physical card?

5

CUDA_VISIBLE_DEVICES=1,2,0 ./application

6

Was hopeful that would work, but it is a bust. Still have all three cards showing…except it works for deviceQuery. That is interesting.

7

A library trace later I find that the program I running calls unsetenv on CUDA_VISIBLE_DEVICES, thank you for you help.