Received: from localhost (maia-3.hub.org [200.46.204.184]) by postgresql.org (Postfix) with ESMTP id 941E39FBB53 for ; Mon, 9 Jul 2007 17:46:39 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.184]) (amavisd-maia, port 10024) with ESMTP id 67002-03 for ; Mon, 9 Jul 2007 17:46:30 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.5 Received: from wa-out-1112.google.com (wa-out-1112.google.com [209.85.146.183]) by postgresql.org (Postfix) with ESMTP id F32919FB60A for ; Mon, 9 Jul 2007 17:46:34 -0300 (ADT) Received: by wa-out-1112.google.com with SMTP id k40so1654550wah for ; Mon, 09 Jul 2007 13:46:33 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=WH9kkXROC2TlV8ld6v31mgdLRevxgcrZHmIY5xG5899JViu+ROkU75j0j777MfJ7BXQuGvtU3Fo5SqSNEWhWNUuP2MikXjjWx87GgvUe9aU8i4BuuBfsXWJMOefglGTauT6cidPM/2YVNvFaNRMMz8wBi28kfHNih93Xa4nDfMs= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=JNGhumDl0i9Z4gdhSqKYoxT8gWu40OA0Rr4JHPhmncUgBBwJYckLeiCkxqvcc3kG0l2Q7jOy/r9Pazegpk57dt8/mZtpPSXV+FUSegLPVIXWQUvBDyDMC+/DWe2oDdQZoVBhgJZISwFk7cubl5hM1Pyzd7Xv0y9ZsPoFKxuUmYQ= Received: by 10.115.93.16 with SMTP id v16mr3469638wal.1184013993400; Mon, 09 Jul 2007 13:46:33 -0700 (PDT) Received: by 10.114.178.5 with HTTP; Mon, 9 Jul 2007 13:46:32 -0700 (PDT) Message-ID: <36e682920707091346w49824ac6x65c8adddbaa0ef7@mail.gmail.com> Date: Mon, 9 Jul 2007 16:46:32 -0400 From: "Jonah H. Harris" To: "Jim C. Nasby" Subject: Re: Filesystem Direct I/O and WAL sync option Cc: "Heikki Linnakangas" , Dimitri , "PostgreSQL Performance" In-Reply-To: <20070709203220.GO39272@nasby.net> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <5482c80a0707030754o740c82b6s4598dc668720d014@mail.gmail.com> <468A65F5.8020800@enterprisedb.com> <20070709203220.GO39272@nasby.net> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200707/69 X-Sequence-Number: 25753 On 7/9/07, Jim C. Nasby wrote: > BTW, it might be worth trying the different wal_sync_methods. IIRC, > Jonah's seen some good results from open_datasync. On Linux, using ext3, reiser, or jfs, I've seen open_sync perform quite better than fsync/fdatasync in most of my tests. But, I haven't done significant testing with direct I/O lately. -- Jonah H. Harris, Software Architect | phone: 732.331.1324 EnterpriseDB Corporation | fax: 732.331.1301 33 Wood Ave S, 3rd Floor | jharris@enterprisedb.com Iselin, New Jersey 08830 | http://www.enterprisedb.com/