Greg Smith <greg@2ndquadrant.com> writes:
> Poking around a bit more, I just discovered another possible approach is
> to use erand48 instead of rand in pgbench, which is either provided by
> the OS or emulated in src/port/erand48.c That's way more resolution
> than needed here, given that 2^48 pgbench accounts would be a scale of
> 2.8M, which makes for a database of about 42 petabytes.
I think that might be a good idea --- it'd reduce the cross-platform
variability of the results quite a bit, I suspect. random() is not
to be trusted everywhere, but I think erand48 is pretty much the same
wherever it exists at all (and src/port/ provides it elsewhere).
regards, tom lane