On 2016-08-04 19:15:43 +0100, Greg Stark wrote: > On Thu, Aug 4, 2016 at 6:53 PM, Andres Freund <and...@anarazel.de> wrote: > > What's the config? Version? What activity does pidstat -d -l indicate? > > How much WAL was generated? > > I know the specifics matter but I was also trying to avoid dumping too > much into the email. > > The shared buffers is set to 16384 (128MB). Otherwise it's a default > config (For 9.4 and before I set checkpoint_segments to 32 as well).
Well, with 128MB I don't find that a very surprising result. You're going to push data out to disk constantly. Given the averaged random access pattern of pgbench that's not really something that interesting. > Never seen pidstat before but pidstat -d looks like it prints very > similar output to the iostat output I was gathering already. There's > nothing else running on the machine. The question is which backends are doing the IO. Greetings, Andres Freund -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers