Totalview® for HPC User Guide : PART V Using the CUDA Debugger : Chapter 28 CUDA Debugging Tutorial : Controlling Execution : Viewing GPU Threads : Viewing the Kernel’s Grid Identifier
Viewing the Kernel’s Grid Identifier
TotalView supports showing the grid identification in the stack frame information when a CUDA thread stops, Figure 270.
 
Figure 270 – Viewing the Grid and Parent Grid Identifiers
The grid is a unique identifier for a kernel running on a device. CUDA supports kernels launching parallel kernels on the same device. The parent grid is the identifier of the grid that launched the kernel currently in focus.