> * Tatsuo Ishii (ishii@postgresql.org) wrote: >> I observe performance degradation with PostgreSQL 9.3 vs 9.2 on Linux >> as well. The hardware is HP DL980G7, 80 cores, 2TB mem, RHEL 6, >> pgbench is used (read only query), scale factor is 1,000 (DB size >> 15GB). > > Can you isolate the sysv-vs-mmap patch and see what happens with just > that change..?
Unfortunately I don't have an access to the machine at this moment.
>> Included is the graph (from PostgreSQL Enterprise Consortium's 2014 >> report page 13: https://www.pgecons.org/downloads/43). I see up to 14% >> degration (at 128 concurrent users) comparing with 9.2. > > That URL returns 'Forbidden'...
Sorry for this. I sent a problem report to the person in charge. In the mean time, please go to: https://www.pgecons.org/download/works_2013/ then click the link "2013 年度WG1活動報告" (sorry for not English). You should be able to download a report (PDF).
Also the report is written in Japanese. I hope you can read at leat the graph in page 13 and the table in page 14.
Is pgecons planning to do a translation of that at some point? It looks like good material, and the audience able to understand it is rather limited now :) -- Michael
