Fun little tool, get ~900M/s after a couple minutes on a 5950X. As the article says though the GPU should clobber that, anyone know of a similar tool that uses the GPU?
Amusingly the tool was archived by the author years ago, and just last year a stupid bug in the random initialization code was found (32 bytes of state initialized with ~31 bits of entropy), leading to ~millions of $ in stolen ETH by exploiters.
I revisited the challenge some years later, and managed to achieve a little over 200 MH/s per core on a 2013 CPU. I'd expect (or at least hope) for modern very high-end CPUs to reach somewhere between 5000-10000 MH/s when using all cores, using a similar decently optimized solution. (The thing you want to optimize is the hashing part.) A high-end GPU from 2016 should manage at least 10000 MH/s and more modern ones are likely to be several times faster.