On Fri, 27 Jul 2001, Roger Larsson wrote:
> But "dbench 32" (on my 256 MB box) results has are the most interesting:
>
> 2.4.0 gave 33 MB/s
> 2.4.8-pre1 gives 26.1 MB/s (-21%)
>
> Do we now throw away pages that would be reused?
Yes. This is pretty much expected behaviour with the use-once
patch, both as it is currently implemented and how it works
in principle.
This is because the use-once strategy protects the working
set from streaming IO in a better way than before. One of the
consequences of this is that streaming IO pages get less of a
chance to be reused before they're evicted.
Database systems usually have a history of recently evicted
pages so they can promote these quick-evicted pages to the
list of more frequently used pages when it's faulted in again.
regards,
Rik
-- Executive summary of a recent Microsoft press release: "we are concerned about the GNU General Public License (GPL)"http://www.surriel.com/ http://www.conectiva.com/ http://distro.conectiva.com/
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This archive was generated by hypermail 2b29 : Tue Jul 31 2001 - 21:00:35 EST