When material is undocumented but discoverable through some means, such as code experimentation, code disassembly, etc. then in some cases I may be able to provide answers based on such discoverable attributes.
As far as I know, this information is not documented.
I don’t know of experiments or methods to discover this information. There may be such experiments, but I don’t know what they are.
In such situations, I am not at liberty to release non-public or non-discoverable or non-documented information about how CUDA behaves, of my own accord, with very limited exceptions.
So at this time I am not able to answer these questions. Further requests for me to answer these questions will not be responded to.
If you feel that CUDA documentation is lacking, one recourse you have is to file a bug using the information provided in a sticky post at the top of this sub forum, and request documentation to cover whatever topics you are interested in. There may be reasons why the CUDA developers choose not to document certain aspects of behavior.