BTW, if you're wondering why curculio is still failing the pgbench test, all is explained here:
https://man.openbsd.org/srandom Or at least most is explained there. While curculio is unsurprisingly failing all four seeded_random tests, when I try it locally on an OpenBSD 6.4 installation, only the uniform, exponential, and gaussian cases reliably "fail". zipfian usually doesn't. It looks like the zipfian code almost always produces 4000 regardless of the seed value, though occasionally it produces 4001. Bad parameters for that algorithm, perhaps? regards, tom lane