Re: [PATCH 6/9] clockpro-clockpro.patch

Marcelo Tosatti
2005-12-31T22:40:21Z

On Fri, Dec 30, 2005 at 11:43:34PM +0100, Peter Zijlstra wrote:
>
> From: Peter Zijlstra <a.p.zijlstra@chello.nl>

Peter,

I tried your "scan-shared.c" proggy which loops over 140M of a file
using mmap (on a 128MB box). The number of loops was configured to "5".

The amount of major/minor pagefaults was exactly the same between
vanilla and clockpro, isnt the clockpro algorithm supposed to be
superior than LRU in such "sequential scan of MEMSIZE+1" cases?

Oh well, to be sincere, I still haven't understood what makes CLOCK-Pro
use inter reference distance instead of recency, given that its a simple
CLOCK using reference bits (but with three clocks instead of one).

But thats probably just my ignorance, need to study more.