On Fri, Apr 22, 2016 at 12:25 AM, Noah Misch <n...@leadboat.com> wrote: > Folks run clusters with ~1000 databases; we previously accepted at least one > complex performance improvement[1] based on that use case. On the faster of > the two machines I tested, the present thread's commits slowed "pg_dumpall > --schema-only --binary-upgrade" by 1-2s per database. That doubles pg_dump > runtime against the installcheck regression database. A run against a cluster > of one hundred empty databases slowed fifteen-fold, from 8.6s to 131s. > "pg_upgrade -j50" probably will keep things tolerable for the 1000-database > case, but the performance regression remains jarring. I think we should not > release 9.6 with pg_dump performance as it stands today.
As someone that is responsible for many such clusters, I strongly agree. -- Peter Geoghegan -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
