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Currently, it is not possible to add NVTX tracing to ops that may be executed on CPU rather than GPU. In that case one would run into exceptions like
tensorflow.python.framework.errors_impl.InvalidArgumentError: Cannot assign a device for operation .../NvtxStart: Could not satisfy explicit device specification '/device:CPU:0' because no supported kernel for CPU devices is available.
This can be fixed in a straight-forward manner by registering CPU kernels for
NvtxStart
andNvtxEnd
. As far as I can tell, NVTX tracing should work fine for non-CUDA code, so this feels generally useful to me.