Excerpts from Robert Haas's message of lun jul 26 08:52:46 -0400 2010: > 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.
What's the problem you see with "another shared memory arena"? Right now we allocate a single large arena, and the lot of shared_buffers, SLRU pools, locking objects, etc are all allocated from there. If we want another 2 MB for "dynamic shmem", we'd just allocate 2 MB more in that large arena and give those to this new code. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
