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The Thursday 2007-09-20 at 09:53 -0600, Bill Anderson wrote:
> > > kernel only needs to send the anonymous memory pages of an
> > > application to swap space, the text (code) can be retrieved from the
> > > disk file for the application.
> > >
> >
> > Which is probably slower than just using swap for all (instead of seeking
> > all around the disk).
> >
> This paging concept has been around for awhile. Even Unix has doesn't page
> text to swap, as the writes are just too expensive. With a good elevator
> algorithm the cost of seeks is minimal.
I know, even windows uses that method. But the real reason was that swap
space was expensive, when the method was invented; that is no longer the
case.
There is a noticeable difference in speed from reading code from each
respective file than compared to read from contiguous raw swap space.
It can be worse if it first have to read the inode, then the code, which I
think it might do.
- --
Cheers,
Carlos E. R.
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