CUDA Profiler, a beginner and so on.... Profiler output an empty file

Hello there.

I’m reading the series “CUDA: Supercomputing for the masses” (Part 6), where the author say something about the CUDA profiler on command line…

I’m trying to use the profiler, but it always output an empty file (cuda_profile.log).

Somone have an idea on what can be happening?