[Solved] How to understand these empty columns in the report?

Developer Tools Nsight Visual Studio Edition
1

Hi,

I am using Nsignt in Visual Studio 2015 for analyzing performance of a NVIDIA Optix application. The UI of the application is written in Python.

As you can see in the Timeline, there are completely empty columns between 2.6152 to 2.6163. I don’t understand what CUDA is doing right there, nor why it is empty. The last Driver API and Function Calls before the empty columns is cuEventElapsedTime

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I have only One GPU, the ray-traced scene is simple and only device to device copy should occur for outputs.

Please help, thanks

Yashiz

2

Solved.

With system tracing enabled, it is very clear that the empty part is called by the sleep code I made.