Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1baSnh-00065b-9c for pgsql-hackers@arkaria.postgresql.org; Thu, 18 Aug 2016 19:16:25 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.84_2) (envelope-from ) id 1baSng-0007bp-S6 for pgsql-hackers@arkaria.postgresql.org; Thu, 18 Aug 2016 19:16:24 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1baSnf-0007bA-Ar for pgsql-hackers@postgresql.org; Thu, 18 Aug 2016 19:16:23 +0000 Received: from sss.pgh.pa.us ([66.207.139.130]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1baSnd-0001U5-34 for pgsql-hackers@postgresql.org; Thu, 18 Aug 2016 19:16:22 +0000 Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.4/8.14.4) with ESMTP id u7IJGGjo020583; Thu, 18 Aug 2016 15:16:16 -0400 From: Tom Lane To: Robert Haas cc: Oskari Saarenmaa , "pgsql-hackers@postgresql.org" Subject: Re: Use pread and pwrite instead of lseek + write and read In-reply-to: References: <7109.1471441241@sss.pgh.pa.us> <6352.1471461075@sss.pgh.pa.us> Comments: In-reply-to Robert Haas message dated "Thu, 18 Aug 2016 14:39:59 -0400" Date: Thu, 18 Aug 2016 15:16:16 -0400 Message-ID: <20582.1471547776@sss.pgh.pa.us> X-Pg-Spam-Score: -2.5 (--) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-hackers Precedence: bulk Sender: pgsql-hackers-owner@postgresql.org Robert Haas writes: > Well, I think you're pointing out some things that need to be figured > out, but I hardly think that's a good enough reason to pour cold water > on the whole approach. If somebody feels like doing the legwork to find out if those performance hazards are real (which I freely concede they may not be), fine. I'm just saying this isn't a slam-dunk commit-it-and-move-on win. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers