On 23.2.2015 00:16, Peter Geoghegan wrote: > On Sun, Feb 22, 2015 at 1:30 PM, Peter Geoghegan <p...@heroku.com> wrote: >> You should try it with the data fully sorted like this, but with one >> tiny difference: The very last tuple is out of order. How does that >> look?
I'm running that test now, I'll post the results tomorrow. > Another thing that may be of particular interest to you as a Czech > person is how various locales perform. I believe that the collation > rules of Czech and Hungarian are particularly complex, with several > passes often required for strcoll() (I think maybe more than 4). You > should either measure that, or control for it. I was prepared to > attribute the differences in the two systems to differences in compute > bandwidth between the CPUs involved (which are perhaps more noticeable > now, since memory latency is less of a bottleneck). However, the > inconsistent use of collations could actually matter here. That's a good point, but all the tests were executed with en_US.UTF-8. -- Tomas Vondra http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, 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
