On 30.03.2011 17:05, Merlin Moncure wrote:
> *) Maybe the shared buffer cache currently being maintained over the
> clog can be scrapped. I'm going to leave it alone for now, but I'm
> quite skeptical it provides much benefit even without local process
> cache. clog page have a very nice property that you don't have to
> worry about what else is going on from other processes and thus no
> complicated locking or invalidation issues when considering cache
> structure. IMNSHO -- this makes a local cache a much better fit even
> if you have to keep it smaller for memory usage reasons.
A related idea I've sometimes pondered is to mmap() the clog in every
process.
-- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com