On Tue, Jun 16, 2009 at 12:47 PM, Stefan Kaltenbrunner<ste...@kaltenbrunner.cc> wrote: > Hi! > > I have been doing some bulk loading testing recently - mostly with a focus > on answering why we are "only" getting a (max of) cores/2(up to around 8 > cores even less with more) speedup using parallel restore. > What I found is that on some fast IO-subsystem we are CPU bottlenecked on > concurrent copy which is able to utilize WAL bypass (and scale up to around > cores/2) and performance without wal bypass is very bad. > In the WAL logged case we are only able to get a 50% speedup using the > second process already and we are never able to scale better than 3x (up to > 8 cores) and performance degrades even after that point.
how are you bypassing wal? do I read this properly that on your 8 core system you are getting 4x speedup with wal bypass and 3x speedup without? merlin -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
