On Thu, Jul 22, 2010 at 3:09 PM, Markus Wanner <mar...@bluegap.ch> wrote: >> FWIW I don't think you should be thinking in "replacing imessages with >> SLRU". I rather think you should be thinking in how can you implement >> the imessages API on top of SLRU. > > Well, I'm rather comparing SLRU with the dynamic allocator. So far I'm > unconvinced that SLRU would be a better base for imessages than a dynamic > allocator. (And I'm arguing that SLRU should use a dynamic allocator > underneath).
Here's another idea. Instead of making imessages use an SLRU, how about having it steal pages from shared_buffers? This would require segmenting messages into small enough chunks that they'd fit, but the nice part is that it would avoid the need to have a completely separate shared memory arena. Ideally, we'd make the infrastructure general enough that things like SLRU could use it also; and get rid of or reduce in size some of the special-purpose chunks we're now allocating. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise Postgres Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
