On Tuesday 29 December 2009 11:48:10 Greg Stark wrote: > On Tue, Dec 29, 2009 at 2:05 AM, Andres Freund <andres@xxxxxxxxxxx> wrote: > > Reads Completed: 2, 8KiB Writes Completed: 2362, > > 29672KiB New: > > Reads Completed: 0, 0KiB Writes Completed: 550, > > 5960KiB > > It looks like the new method is only doing 1/6th as much i/o. Do you > know what's going on there? While I was surprised by the amount of difference I am not surprised at all that there is a significant one - currently the fsync will write out a whole bunch of useless stuff every time its called (all metadata, directory structure and so on) This is reproducible... 6MB sounds sensible for the operation btw - the template database is around 5MB. Will try to analyze later what exactly causes the additional io. Andres -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
