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CUDA Frequently Asked Questions

nvprof reports “No kernels were profiled”

When using the nvprof tool to profile Numba jitted code for the CUDA target, the output contains No kernels were profiled but there are clearly running kernels present, what is going on?

This is quite likely due to the profiling data not being flushed on program exit, see the NVIDIA CUDA documentation for details. To fix this simply add a call to numba.cuda.profile_stop() prior to the exit point in your program (or wherever you want to stop profiling). For more on CUDA profiling support in Numba, see Profiling.