On Feb 6, 2005, at 11:49 PM, David Laight wrote:

> What you need to avoid is the UBC discarding all its current pages in 
> order
> to keep all the mapped, and recently faulted in, pages of the file 
> that you
> aren't going to use again in the near future.

Well, this is going to happen anyway regardless if you map the whole 
file or chunks of the file in sequence.

-- thorpej