Andres Freund <andres@xxxxxxxxxxx> writes: > This speeds up CREATE DATABASE from ~9 seconds to something around 0.8s on my > laptop. Still slower than with fsync off (~0.25) but quite a worthy > improvement. I can't help wondering whether that's real or some kind of platform-specific artifact. I get numbers more like 3.5s (fsync off) vs 4.5s (fsync on) on a machine where I believe the disks aren't lying about write-complete. It makes sense that an fsync at the end would be a little bit faster, because it would give the kernel some additional freedom in scheduling the required I/O, but it isn't cutting the total I/O required at all. So I find it really hard to believe a 10x speedup. regards, tom lane -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
