Hi, root@testBI:/etc/postgresql/9.1/main# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 892 MB in 2.01 seconds = 444.42 MB/sec Timing buffered disk reads: 190 MB in 3.02 seconds = 62.90 MB/sec Is fsync off by default ? I have#fsync = on (so it's off right ?). pgbench is not found on my server. Do i have to apt-get install pgbench ? Rude - Last Territory Ou écouter ?http://www.deezer.com/fr/music/last-territory/the-last-hope-3617781 (Post-apocalyptic Metal)http://www.deezer.com/fr/music/rude-undertaker (Pop-Rock) Ou acheter ?La Fnachttp://recherche.fnac.com/fmia14622213/Last-Territory http://recherche.fnac.com/fmia14770622/Rude-Undertaker
iTuneshttp://itunes.apple.com/us/artist/last-territory/id533857009?ign-mpt=uo%3D4 Date: Wed, 26 Sep 2012 08:34:06 -0700 From: ml-node+s1045698n5725533...@n5.nabble.com To: ffw_r...@hotmail.com Subject: Re: Same query doing slow then quick Hi, FFW_Rude 1. Benchmark the device with your PostgreSQL DB: # hdparm -tT /dev/sda /dev/sda: Timing cached reads: 6604 MB in 2.00 seconds = 3303.03 MB/sec Timing buffered disk reads: 1316 MB in 3.00 seconds = 438.18 MB/sec 2. Benchmark your PostgreSQL with pgbench: Set "fsync = off" on /var/lib/pgsql/data/postgresql.conf # /etc/init.d/postgresql restart # su - postgres$ psql# create database pgbench;# \q# pgbench -i pgbench && pgbench -c 10 -t 10000 pgbench tps = 5670.635648 (including connections establishing)tps = 5673.630345 (excluding connections establishing)[/code] Set "fsync = on" on /var/lib/pgsql/data/postgresql.conf # /etc/init.d/postgresql restart --With best regards,Nikolay If you reply to this email, your message will be added to the discussion below: http://postgresql.1045698.n5.nabble.com/Same-query-doing-slow-then-quick-tp5725486p5725533.html To unsubscribe from Same query doing slow then quick, click here. NAML -- View this message in context: http://postgresql.1045698.n5.nabble.com/Same-query-doing-slow-then-quick-tp5725486p5725536.html Sent from the PostgreSQL - performance mailing list archive at Nabble.com.
