debugging CUDA code

Question

i am using Nsight along with VS 2008 to debug my cuda code.
I have 2 Geforce GTX 460 SE cards in my computer.
i read Nsight's user guide and updated Nvidia Control panel as stated in the guide.
but i still have a problem. in my code when i set cudaSetDevice(0); i get an error in nsight stating that i cannot debug since the device is attached to a monitor, which is true.
but when i set cudaSetDevice(1); and start cuda debugging, nsight gives no errors, but the program does not break at the breakpoint that i put in the code!.
does anybody know whats wrong?

Answer 1

Set the -G0 flag in the CUDA Build Rule to enable debug information in the compiled code. Your breakpoint should be hit after that.

(Reply contributed originally by Jawad Masood, so I have made the reply Community Wiki.)