On 2015-01-13 15:49:33 -0800, Peter Geoghegan wrote: > On Tue, Jan 13, 2015 at 3:21 PM, Andres Freund <and...@2ndquadrant.com> wrote: > > My guess is rather that it's contention on the freelist lock via > > StrategyGetBuffer's. I've seen profiles like this due to exactly that > > before - and it fits to parallel loading quite well. > > I'm not saying you're wrong, but the breakdown of _bt_moveright() > relative to _bt_relandgetbuf() calls seems a bit fishy to me.
The hierarchical profile definitely doesn't look like my guess was right. > I don't remember seeing _bt_moveright() or _bt_compare() figuring so > prominently, where _bt_binsrch() is nowhere to be seen. I can't see a > reference to _bt_binsrch() in either profile. Well, we do a _bt_moveright pretty early on, so that actually might be cache misses we're primarily seing. Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
