Wow, thats huge performance gain. And it was on ext4? -- Linux Polska Sp. z o.o. Przemysław Deć - Senior Solutions Architect RHCSA, RHCJA, PostgreSQL Professional Certification mob: +48 519 130 141 email: p...@linuxpolska.pl www.linuxpolska.pl ___________________________________________________________________________________________________________________________ Linux Polska Sp. z o. o. Al. Jerozolimskie 123A (26 p.); 02-017 Warszawa; tel. (+48) 222139571; fax (+48)222139671 KRS - 0000326158 Sąd Rejonowy dla M. St. Warszawy w Warszawie, XII Wydział Gospodarczy KRS Kapitał zakładowy wpłacony 1 000 500PLN; NIP 7010181018; REGON 141791601
[image: Open Source Day 2015] <http://opensourceday.pl/> 2015-04-09 13:01 GMT+02:00 Graeme B. Bell <g...@skogoglandskap.no>: > > From a measurement I took back when we did the upgrade: > > performance with 2.6: (pgbench, size 100, 32 clients) > > 48 651 transactions per second (read only) > 6 504 transactions per second (read-write) > > > performance with 3.18 (pgbench, size 100, 32 clients) > > 129 303 transactions per second (read only) > 16 895 transactions (read-write) > > > So that looks like 2.6x improvement to reads and writes. That was an 8 > core xeon server with H710P and 4x crucial M550 SSDs in RAID, pg9.3. > > Graeme Bell > > > > > > On 09 Apr 2015, at 12:39, Przemysław Deć <przemyslaw....@linuxpolska.pl> > wrote: > > > Can you say how much faster it was? > > > > Przemek Deć > > > > 2015-04-09 11:04 GMT+02:00 Graeme B. Bell <g...@skogoglandskap.no>: > > > > > > Josh, there seems to be an inconsistency in your blog. You say 3.10.X > is > > > safe, but the graph you show with the poor performance seems to be from > > > 3.13.X which as I understand it is a later kernel. Can you clarify > which > > > 3.X kernels are good to use and which are not? > > > > Sorry to cut in - > > > > So far we've found kernel 3.18 to be excellent for postgres 9.3 > performance (pgbench + our own queries run much faster than with the > 2.6.32-504 centos 6 kernel, and we haven't encountered random stalls or > slowness). > > > > We use elrepo to get prebuilt rpms of the latest mainline stable kernel > (kernel-ml). > > > > http://elrepo.org/tiki/kernel-ml > > > > Graeme Bell > > > > -- > > Sent via pgsql-performance mailing list ( > pgsql-performance@postgresql.org) > > To make changes to your subscription: > > http://www.postgresql.org/mailpref/pgsql-performance > > > >
