Debug Information not available at current location when using NSIGHT VS Next-Gen Debugger

Developer Tools Nsight Visual Studio Edition
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1

Hello there!

When setting a conditional breakpoint on a device (gpu) kernel and using the Extensions->Nsight-> Start CUDA Debugging (Next-Gen) in Visual Studio 2022 on Windows 10, I get an error saying: Debug Information not available at current location ‘i==1’.

Specifically, I tried setting the conditional breakpoint to break on a specific iteration of a kernel for loop. However, then I tried to also set a breakpoint (condition: @blockIdx(0,1,0)) as referenced in the developer manual (here), which resulted in the same error.

I am using CUDA 12.1 with a Driver Version 531.14 and Nsight Visual Studio Edition 2023.1.0 (compatible with driver version 531.05 or later).

For simplicity, I tried to create a hello-world style CUDA kernel an apply conditional breakpoints, which all failed with the same error. Code:

__global__ void cuda_hello(){
    printf("Hello World from GPU!\n");
    for (int i = 0; i < 5; i++) {
        // set conditional breakpoint in the above line, condition: i == 1
    }
}

int main() {
    cuda_hello<<<1,1>>>(); 
    return 0;
}
2

You need to compile with “Generate GPU Debug information” = “Yes (-G)”
See Build and Run :: NVIDIA Nsight VSE Documentation, under the ‘Device’ heading. The nvcc -G option generates GPU debug and line information for your debugging sessions. Be sure to compile without the -G (and --lineinfo) in your release/production builds to get the best optimization and performance.

Let us know if you’re already doing this.
Hope that helps!

3

Thank you! After reinstalling CUDA and Nvidia Nsight Visual Studio, this problem no longer persisted, I noted that the option Generate GPU Debug information came enabled (Yes (-G)) immediatelly upon installation.

However, this spawned an another, albeit less pleasant error: Nsight version 2023.1 for Visual Studio 2022 hits breakpoints incorrectly

Thank you for the help!

4

the code is compiled with debugging information, you can check the project properties in Visual Studio. Under “Configuration Properties” → “CUDA C/C++” → “Debugging”, make sure that the “Generate GPU Debug Information” option is set to “Yes (-g)”.

Another thing to check is that the Nsight debugger is able to find the debug information for your code. Make sure that the “Nsight->Options->CUDA->Generate Debug Information” option is set to “Yes” and that the “Nsight->Options->CUDA->Debug Information Search Path” option points to the correct directory where the debug information files are located.