All CUDA devices are used for display and cannot be used while debugging.

Fatal: All CUDA devices are used for display and cannot be used while debugging. (error cod=CUDBG_ERROR_ALL_DEVICES_WATCHDOGGED)(0x18)

问题解释：http://stackoverflow.com/questions/4025620/how-do-i-debug-a-cuda-library-with-only-1-graphics-card-running-x11

display driver has a protection mechanism called watchdog timer which is enabled when the GPU in use also drives a display. The watchdog timer interrupts any kernel that runs for longer AFAIR 5s. This is intended to prevent GPU lockups. Alternatively, you could try using ocelot, but I am not sure how good are the debugging features it provides.

解决办法：https://devblogs.nvidia.com/parallelforall/cudacasts-episode-4-single-gpu-debugging-cuda-5-5/

接下来