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cudanvidiathrustdynamic-parallelism

Nvidia visual profiler not showing cudaMalloc() after kernel launch

I am trying to write a program that runs almost entirely on the GPU (with very little interaction with the host). initKernel is the first kernel that is being launched from the host. I use Dynamic parallelism to launch successive kernels from the initKernel, two of which are thrust::sort(thrust::device,...).

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Before launching the initKernel, I do a cudaMalloc() on the host code and it is shown in the Runtime API of the Visual profiler. None of the cudaMallocs that appear in the __device__ functions and successive kernels (after the launch of initKernel) are shown in the Runtime API of the Visual profiler. Can someone help me understand why I cannot see the cudaMallocs in the Visual profiler?

Thank you for your time.

Solution

  • Can someone help me understand why I cannot see the cudaMallocs in the Visual profiler?

    Because it is a documented limitation of the tool. From the documentation:

    The Visual Profiler timeline does not display CUDA API calls invoked from within device-launched kernels.