Re: [RFC] - Some notions that I would like comments on
Jamie Lokier (lkd@tantalophile.demon.co.uk)
Tue, 13 Jul 1999 20:31:48 +0200
Jeff Dike wrote:
> > 2. Most applications will look at data as soon as it's read from the
> > disk -- so you probably won't get much of a performance advantage
>
> What I had in mind are things like compilers which go chugging
> sequentially through a file and do expensive stuff on it (like
> parsing). It ought to be pretty easy for the I/O to stay ahead of the
> parse, and maybe a useful amount of parsing can be done before the
> data all comes in.
This is done already and automatically -- it's called readahead.
The kernel detects when you're reading sequentially and then
reads ahead.
We don't do it on mmaped areas yet though.
-- Jamie
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