X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (unknown [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id 4682E528BB for ; Wed, 20 Jul 2005 01:49:16 -0300 (ADT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 65946-09 for ; Wed, 20 Jul 2005 04:49:13 +0000 (GMT) Received: from rambo.iniquinet.com (rambo.iniquinet.com [69.39.89.10]) by svr1.postgresql.org (Postfix) with ESMTP id EA781528AD for ; Wed, 20 Jul 2005 01:49:12 -0300 (ADT) Received: (qmail 17371 invoked by uid 1010); 20 Jul 2005 00:49:11 -0400 Received: from Robert_Creager@LogicalChaos.org by rambo.iniquinet.com by uid 1002 with qmail-scanner-1.20 (clamscan: 0.70. spamassassin: 3.0.3. Clear:RC:0(63.147.78.131):SA:0(?/?):. Processed in 1.20231 secs); 20 Jul 2005 04:49:11 -0000 Received: from unknown (HELO thunder.logicalchaos.org) (perl?test@logicalchaos.org@63.147.78.131) by rambo.iniquinet.com with AES256-SHA encrypted SMTP; 20 Jul 2005 00:49:10 -0400 Received: from logicalchaos.org (thunder.logicalchaos.org [192.168.0.250]) by thunder.logicalchaos.org (Postfix) with ESMTP id C141912D00B; Tue, 19 Jul 2005 22:49:08 -0600 (MDT) Date: Tue, 19 Jul 2005 22:49:08 -0600 From: Robert Creager To: Robert Creager Cc: Tom Lane , Robert Creager , pgsql-performance@postgresql.org, Andy Hewitt III Subject: Re: Huge performance problem between 7.4.1 and 8.0.3 - CS Message-ID: <20050719224908.15415222@thunder.logicalchaos.org> In-Reply-To: <20050719120951.00002520@C118181.stortek.com> References: <20050718114952.00004ac5@C118181.stortek.com> <15472.1121709173@sss.pgh.pa.us> <20050719105014.00007635@C118181.stortek.com> <7322.1121792062@sss.pgh.pa.us> <20050719120951.00002520@C118181.stortek.com> Organization: Starlight Vision, LLC. X-Mailer: Sylpheed-Claws 1.0.3 (GTK+ 1.2.10; i586-mandrake-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/signed; boundary=Signature_Tue__19_Jul_2005_22_49_08_-0600_wWEYYWYeiUbpipZS; protocol="application/pgp-signature"; micalg=pgp-sha1 X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.001 tagged_above=0 required=5 tests=AWL X-Spam-Level: X-Archive-Number: 200507/333 X-Sequence-Number: 13574 --Signature_Tue__19_Jul_2005_22_49_08_-0600_wWEYYWYeiUbpipZS Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable When grilled further on (Tue, 19 Jul 2005 12:09:51 -0600), Robert Creager confessed: > On Tue, 19 Jul 2005 12:54:22 -0400 > Tom Lane wrote: >=20 > > Hmm, I hadn't thought about the possible impact of multiple concurrent > > vacuums. Is the problem caused by that, or has performance already gone > > into the tank by the time the cron-driven vacuums are taking long enough > > to overlap? >=20 >=20 > I'll re-start the database, vacuum full analyze and restart the runs with= out the > cron vacuum running. >=20 It took a few hours, but the problem did finally occur with no vacuum runni= ng on 803. CS is averaging 72k. I cannot quantitatively say it took longer to reproduce than with the vacuums running, but it seemed like it did. Can any information be gotten out of this? Should I try CVS HEAD? Thoughts? Thanks, Rob --=20 22:41:36 up 6 days, 2:16, 6 users, load average: 0.15, 0.21, 0.30 Linux 2.6.5-02 #8 SMP Mon Jul 12 21:34:44 MDT 2004 --Signature_Tue__19_Jul_2005_22_49_08_-0600_wWEYYWYeiUbpipZS Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iEYEARECAAYFAkLd18QACgkQLQ/DKuwDYznK2QCghoAdxDC1d7NdiXZbWbT+H0B8 qzEAoJekKizUGtpYUdlDVo62F6N7KkKs =M0q0 -----END PGP SIGNATURE----- --Signature_Tue__19_Jul_2005_22_49_08_-0600_wWEYYWYeiUbpipZS--