Re: swap cache
Helge Hafting (helge.hafting@daldata.no)
Tue, 22 Dec 1998 09:11:12 +0100
[...]
> >This whole thread is domitated by "one process at a time" thinking.
>
> Not on my part. I'm making several different claims about compressed
> caching, which I should have been careful to distinguish (sorry):
>
> 1. for small diskless systems, it's a win
>
> 2. for small systems with slow disks, or where
> power consumption is an issue, it's a win
>
> 3. for I/O bound systems, it's a win,
>
> 4. for CPU-bound systems, it can turn itself off and avoid
> being a lose
>
> 5. for systems that are CPU-bound sometimes and disk-bound
> sometimes, it can adapt and do the right thing in each
> case
It may adapt and do the right thing when writing to swap.
There is no choice when data is read from the swap device though. You
could fault in a bunch of compressed pages in one process while
another process is doing something cpu-intensive.
Helge Hafting
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