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I installed NVIDIA Nsight Visual Studio Edition 2025.01 in Visual Studio 2022.

I want to debug code, but I can't debug with step over(F10), The debugger always stops at a location without a breakpoint.

I checked out the document, but I couldn't figure it out.

Here are some force-break code location:

__device__ __host__ TVector3(T e0, T e1, T e2) : x(e0), y(e1), z(e2) {}

template <typename T>
__device__ __host__ inline TVector3<T> operator+(const TVector3<T>& u, const TVector3<T>& v) {
    return TVector3(u.x + v.x, u.y + v.y, u.z + v.z);
}
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The debugger is stopping at “weird” places because the compiler inlined/optimized template/device functions (and/or you don’t have device debug symbols), so source binary mapping is not 1:1.

Quick steps to fix (do these in your Debug build)

  1. Build with device debug info and disable device optimizations:

    • nvcc: add -G (Generate debug info for device) and disable optimizations for CUDA code.

    • Only use -G for local debug builds (it drastically changes code/performance).

  2. Build host with debug info and no optimizations:

    • MSVC: C/C++ → Optimization = Disabled (/Od) and Debug Info = /Zi.

    • Clean + full rebuild.

  3. Force a non-inlined function where you want a reliable breakpoint:

    • Use noinline on the functions you debug:

      • GCC/Clang/nvcc: attribute((noinline))

      • MSVC: __declspec(noinline)

    • Example:
      device host attribute((noinline)) TVector3<T> operator+(...) { ... }

  4. Start the correct debug session in Nsight:

    • Use “Start CUDA Debugging” / Nsight CUDA debug to hit device code. The normal VS debugger only handles host.

  5. Verify symbols and sources:

    • Check Modules window / Nsight logs to ensure PDB / debug symbols for the binary are loaded and match source files.

  6. Short-run kernel for easier stepping:

    • Run a tiny grid (1 block, 1 thread) while debugging so it’s reproducible and easier to step.
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