On Thursday 14 April 2011 22:21:26 Alvaro Herrera wrote: > Excerpts from Andres Freund's message of jue abr 14 17:08:34 -0300 2011: > > Hi, > > > > On Thursday 14 April 2011 16:43:16 Tom Lane wrote: > > > I doubt that it's possible to make AllocSetAlloc radically cheaper. > > > > I actually doubt your doubt. I think you could add some SLAB like > > interface for common allocation sizes making it significantly faster for > > some uses (because allocation/deallocation is a single linked list > > operation). Maybe even treat everything < some_size as a slab object in > > the next bigger slab. > I think the problem with a slab allocator is that it would make > hierarchical context management slower and/or more complicated (e.g. > reset context on transaction abort). I am not that sure that it would be slower. I think that if youre careful you mostly can reuse what currently is done for chunks to implement slabs. For context resets you can just throw away all chunks/blocks.
Where I am with you is that its quite possible that it will not make sense (performancewise) for all contexts. Which is quite annoying. Andres -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
