On Tue, May 1, 2012 at 3:08 PM, Robert Haas <robertmh...@gmail.com> wrote:
> We've previously discussed the possible desirability of extending > relations in larger increments, rather than one block at a time, for > performance reasons. I attempted to determine how much performance we > could possibly buy this way, and found that, as far as I can see, the > answer is, basically, none. Fair enough, but my understanding was that tests showed that the extension lock was a bottleneck, so doing extensions in larger chunks should reduce the time we spend waiting for a lock and thus improve performance. So while your results here show no gain, there is gain to be had elsewhere as a result. The algorithm needs to be adaptive, so we don't waste space on smaller tables or lower loads. -- Simon Riggs 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
