----- Original Message ----- > From: "Mark Kirkwood" <mark.kirkwood@xxxxxxxxxxxxxxx> > To: "Tigran Mkrtchyan" <tigran.mkrtchyan@xxxxxxx> > Cc: "Merlin Moncure" <mmoncure@xxxxxxxxx>, "postgres performance list" <pgsql-performance@xxxxxxxxxxxxxx> > Sent: Friday, September 19, 2014 8:26:27 AM > Subject: Re: postgres 9.3 vs. 9.4 > > On 19/09/14 17:53, Mkrtchyan, Tigran wrote: > > > > > > ----- Original Message ----- > >> From: "Mark Kirkwood" <mark.kirkwood@xxxxxxxxxxxxxxx> > > >> Further to the confusion, here's my 9.3 vs 9.4 on two M550 (one for 9.3 > >> one for 9.4), see below for results. > >> > >> I'm running xfs on them with trim/discard enabled: > >> > >> $ mount|grep pg > >> /dev/sdd4 on /mnt/pg94 type xfs (rw,discard) > >> /dev/sdc4 on /mnt/pg93 type xfs (rw,discard) > >> > >> > >> I'm *not* seeing any significant difference between 9.3 and 9.4, and the > >> numbers are both about 2x your best number, which is food for thought > >> (those P320's should toast my M550 for write performance...). > > > > cool! any details on OS and other options? I still get the same numbers > > as before. > > > > Sorry, Ubuntu 14.04 on a single socket i7 3.4 Ghz, 16G (i.e my workstation). > > I saw the suggestion that Didier made to run 9.3 on the SSD that you > were using for 9.4, and see if it suddenly goes slow - then we'd know > it's something about the disk (or filesystem/mount options). Can you > test this? swapping the disks did not change the results. Nevertheless, I run the same test on my fedora20 laptop 8GB RAM, i7 2.2GHz and got 2600tps! I am totally confused now! Is it kernel version? libc? Tigran. > > Cheers > > Mark > -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
