True, but in this case, xorshift128+ already maximizes its period by going through every possible state once before repeating. It only has 128 bits of state, b

True, but in this case, xorshift128+ already maximizes its period by going through every possible state once before repeating. It only has 128 bits of state, but still, the difference between "128 bits" and "all of RAM" is only a constant factor. :) And of course, a period of 2^128 is already more than high enough that it will never repeat in practice.