What to watch out for when running two instances of Hashcat at once?

[royce]

Got it; do they interact well together with the potfile or does --session make them have separate potfiles? I don't believe so, based on the wiki, so would I need to do --potfile-path for them as well(assuming that the answer to my first question is no)?

Writing to the same potfile by two different processes seems undefined to me (but I haven't looked at the code). I always explicitly specify the potfile to match the session, and then combine potfiles using a separate script into a potfile that is not used by any session, to minimize chances of weird behavior. But do whatever seems best for you.