Multiple nodes on the same machine

I'm in the progress setting up multiple nodes in one box, using this article as a reference. A couple of doubts:

  1. number of cores, Does this refer to physical cores or cores including hyper-threading? With hyper-threading, my machine has 32 cores (nproc shows 32), but it only have 16 physical cores in fact.
  2. referring to the file descriptors and mmap file limits, e.g for open fie descriptors, for one node, we set to 64k, do I need to set this to 64K * n? n is the number of nodes to be installed on the box.

Thanks in advance!