It’s not possible to predict which kernels will be called in your script before running it, as this would need a sort of static code analysis, which would also need to know your current setup, since kernels are also depending on the GPU. Also, if you are using cudnn benchmarking, the actual kernel choice depends on the profiling, which is also non-deterministic and could depend on the workload your machine has at the moment.
Could you explain a bit what “size” of the kernel you are referring to?