Hi!The disk subsystem will be a RAID 1, but for now it's just a single 7200 rpm 160 GB SATA hard drive. The PgSQL version is 8.3, the latest one.
I have done some performance tests on the drive, and it handles about 40 MB/s on sequential writes, so I'm assuming it's OK.
Yours Miguel Arroz On 2008/03/10, at 23:56, Joshua D. Drake wrote:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Mon, 10 Mar 2008 23:46:10 +0000 Miguel Arroz <arroz@xxxxxxxxxxx> wrote: tty ad4 ad6 cputin tout KB/t tps MB/s KB/t tps MB/s us ni sy in id 0 60 33.48 449 14.66 0.00 0 0.00 11 0 3 0 86 0 180 16.85 599 9.87 0.00 0 0.00 1 0 1 0 98 0 60 55.37 455 24.58 0.00 0 0.00 25 0 4 1 69 0 60 49.83 376 18.28 0.00 0 0.00 18 0 5 1 76 0 60 29.86 363 10.58 0.00 0 0.00 3 0 0 1 96 0 60 36.21 365 12.90 0.00 0 0.00 12 0 3 1 84 0 60 33.13 353 11.41 0.00 0 0.00 2 0 2 0 96 0 60 39.47 345 13.28 0.00 0 0.00 16 0 3 0 80 0 60 40.48 363 14.34 0.00 0 0.00 8 0 2 0 89 0 60 30.91 397 11.97 0.00 0 0.00 5 0 2 0 93 0 60 18.21 604 10.75 0.00 0 0.00 5 0 2 0 93 0 60 48.65 359 17.04 0.00 0 0.00 20 0 6 0 74 0 60 32.91 375 12.04 0.00 0 0.00 10 0 4 0 86 0 60 35.81 339 11.84 0.00 0 0.00 3 0 2 0 96 0 60 33.38 394 12.83 0.00 0 0.00 11 0 4 0 85 0 60 34.40 313 10.51 0.00 0 0.00 4 0 2 0 93 0 60 45.65 358 15.94 0.00 0 0.00 19 0 7 0 74 0 60 37.41 309 11.28 0.00 0 0.00 3 0 2 0 95 0 60 32.61 447 14.22 0.00 0 0.00 10 0 3 1 86 0 60 17.11 516 8.63 0.00 0 0.00 1 0 1 0 98 There's surely a lot of disk activity going on. With this figures, I could have written some hundred gigabytes during the query execution! Something is definitely not right here.Well the above says you are getting ~ 10-15MB/s a second performance. What is the disk subsystem you have. Also note that the duration probably went up because you didn't vacuum between tests. What version of PostgreSQL (I missed it). Joshua D. Drake - -- The PostgreSQL Company since 1997: http://www.commandprompt.com/ PostgreSQL Community Conference: http://www.postgresqlconference.org/ Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate PostgreSQL political pundit | Mocker of Dolphins -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFH1cq5ATb/zqfZUUQRAhVvAKCfQk4Mg6qLNQfc6uyiI2TBSbkThACeK/5k Tgc9ltxoOvnTMzKG2hG/4LY= =Tm4N -----END PGP SIGNATURE----- --Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx )To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
Miguel Arroz http://www.terminalapp.net http://www.ipragma.com
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