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The NVIDIA Nsight main menu has a global freeze option. This allows you to control which warps will make progress when using any CUDA run control (such as stepping, resume, or run to cursor). For example, you can ensure that only one warp moves when stepping.

Note that a barrier in the code will prevent a warp from making any progress, if the other warps are frozen. This is because all warps in a block need to get past the barrier, and they would not be able to if others are frozen. In this case, you can use async break to get back control in the debugger.

This option must be set in each debug session. It does not persist between sessions.

To use Global Freeze:

1. Launch the CUDA Debugger.
   1. Open a CUDA-based project.
   2. Set a breakpoint in the project. (See Walkthrough: Debugging a CUDA Application for information on how to set a breakpoint.) 
   3. Make sure that the Nsight Monitor is running on the target machine.
   4. From the Nsight menu, select Start CUDA Debugging.
      
      As an alternate option, you can also right-click on the project in Solution Explorer and choose Start CUDA Debugging.
      
      
   5. The CUDA Debugger starts and launches the target application.
      
      
2. When the application is suspended at a breakpoint, go to the Nsight menu and choose Freeze. Select the freeze option that you wish to utilize.
   
   

Selecting a Freeze Preference:

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NVIDIA GameWorks Documentation Rev. 1.0.150630 ©2015. NVIDIA Corporation. All Rights Reserved.