GPU Time Width Plot in CUDA Visual Profiler / Asyn mem copy

Accelerated Computing CUDA CUDA Programming and Performance
1

I just started to use the CUDA visual profiler.

Now, I have two questions.

We can see a GPU Time Width Plot in the Profiler.
In this, do white regions between colored bar mean idle time of GPU?

And, is asynchronous memory copy not measured by CUDA Visual Profiler?

Thanks.