On Fri, Aug 22, 2014 at 2:13 PM, Tomas Vondra <t...@fuzzy.cz> wrote: > I don't think we really need to abandon the 'tracked' flag (or that we > should). I think it was useful, and removing it might be one of the > reasons why Robert now sees worse impact than before.
The version that introduced that flag had the same overhead as the previous version that didn't, at least in my testing, so I'm not sure it's at all useful. Part of the problem here is that the number of instructions that you can afford to take to complete a memory allocation is just really small, and so every one hurts. Memory latency may be an issue as well, of course. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers