Swap size for large memory machines

What is a reasonable amount of swap space to allocate for a machine
with a fair amount of memory?

I used to feel (for reasons unknown) that twice as much swap space as
real memory was reasonable--but does that make any sense when you have
256 megabytes of memory?

I'm asking because the standard 'b' partition on Pyramid's layout for
the 1 gigabyte NEC 2363 drive is 30 megabytes.  That seems a bit stingy
and I'm wondering what to do about it.  Should I create my own (larger)
partitions (which I'm doing anyhow for other disks)?

If it matters at all, this is for OSx5.0 on a MIServer.

    David J. Sullivan, Davis Polk & Wardwell, 14 Wall Street, NYC 10005
ARPA:  sullivan at acf4.nyu.edu          UUCP:  {uunet|cmcl2}!esquire!sullivan