On 2014-02-18 01:35:52 +0900, MauMau wrote: > From: "Andres Freund" <and...@2ndquadrant.com> > >On 2014-02-18 00:43:54 +0900, MauMau wrote: > >>I'm worried about the big increase in max latency. Do you know the > >>cause? > >>More frequent checkpoints caused by increased WAL volume thanks to > >>enhanced > >>performance? > > > >I don't see much evidence of increased latency there? You can't really > >compare the latency when the throughput is significantly different. > > For example, please see the max latencies of test set 2 (PG 9.3) and test > set 4 (xlog scaling with padding). They are 207.359 and 1219.422 > respectively. The throughput is of course greatly improved, but I think the > response time should not be sacrificed as much as possible. There are some > users who are sensitive to max latency, such as stock exchange and online > games.
You need to compare both at the same throughput to have any meaningful comparison. Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
