Scott Ribe <scott_ribe(at)killerbytes(dot)com> writes:
> Finally, the error message you're getting doesn't indicate that postgres is
> actually requesting much memory. I suspect that you may have something else
> running on your system which is using SysV shared memory.
Recent versions of OS X have ipcs, so you could try "sudo ipcs -m" to
find out about that.
regards, tom lane