On Tue, Nov 21, 2017 at 12:01 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: > "Henrik Cednert (Filmlance)" <henrik.cedn...@filmlance.se> writes: >> The last pg_dump with 8.4 took 212 minutes and 49 seconds.And now with 9.5 >> the very same pg_dump takes 644 minutes and 40 seconds. To it takes about >> three times as long now and I have no idea to why. Nothing in the system or >> hardware other than the pgsql upgrade have change. > > Can you get a profile of where the machine is spending its time during the > dump run? On Linux I'd recommend "perf", but on macOS, hmm ... > You could use Activity Monitor, but as far as I can see that just captures > short-duration snapshots, which might not be representative of a 10-hour > run. XCode's Instruments feature would probably be better about giving > a full picture, but it has a steep learning curve.
macOS's "sample" is pretty easy to use and produces text format output that is easy to email. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
