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