From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp2 ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id wBKiME1Vl19sHwAA0tVLHw (envelope-from ) for ; Mon, 26 Oct 2020 23:01:33 +0000 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp2 with LMTPS id JtNnLE1Vl1+fSQAAB5/wlQ (envelope-from ) for ; Mon, 26 Oct 2020 23:01:33 +0000 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id 21CDC940215 for ; Mon, 26 Oct 2020 23:01:33 +0000 (UTC) Received: from localhost ([::1]:47550 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kXBUZ-0007BS-C0 for larch@yhetil.org; Mon, 26 Oct 2020 19:01:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52746) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kXBU8-00078y-8i for bug-guix@gnu.org; Mon, 26 Oct 2020 19:01:08 -0400 Received: from debbugs.gnu.org ([209.51.188.43]:58649) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kXBU6-0005JO-E8 for bug-guix@gnu.org; Mon, 26 Oct 2020 19:01:03 -0400 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1kXBU6-00010u-Ao for bug-guix@gnu.org; Mon, 26 Oct 2020 19:01:02 -0400 X-Loop: help-debbugs@gnu.org Subject: bug#43850: cuirass: inconsistent SQL queries execution time. Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= Original-Sender: "Debbugs-submit" Resent-CC: bug-guix@gnu.org Resent-Date: Mon, 26 Oct 2020 23:01:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 43850 X-GNU-PR-Package: guix X-GNU-PR-Keywords: To: Mathieu Othacehe Received: via spool by 43850-submit@debbugs.gnu.org id=B43850.16037532043742 (code B ref 43850); Mon, 26 Oct 2020 23:01:02 +0000 Received: (at 43850) by debbugs.gnu.org; 26 Oct 2020 23:00:04 +0000 Received: from localhost ([127.0.0.1]:41962 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kXBTA-0000yH-JC for submit@debbugs.gnu.org; Mon, 26 Oct 2020 19:00:04 -0400 Received: from eggs.gnu.org ([209.51.188.92]:52384) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kXBT9-0000xE-2d for 43850@debbugs.gnu.org; Mon, 26 Oct 2020 19:00:03 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:37224) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kXBT3-00051S-OJ for 43850@debbugs.gnu.org; Mon, 26 Oct 2020 18:59:57 -0400 Received: from [2a01:e0a:1d:7270:af76:b9b:ca24:c465] (port=37664 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kXBSy-0003xQ-M1; Mon, 26 Oct 2020 18:59:56 -0400 From: Ludovic =?UTF-8?Q?Court=C3=A8s?= References: <87a6wyhviz.fsf@gnu.org> <87362gg35r.fsf@gnu.org> <87362986k7.fsf@gnu.org> <87blguzdig.fsf@gnu.org> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 5 Brumaire an 229 de la =?UTF-8?Q?R=C3=A9volution?= X-PGP-Key-ID: 0x090B11993D9AEBB5 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 3CE4 6455 8A84 FDC6 9DB4 0CFB 090B 1199 3D9A EBB5 X-OS: x86_64-pc-linux-gnu Date: Mon, 26 Oct 2020 23:59:51 +0100 In-Reply-To: <87blguzdig.fsf@gnu.org> (Mathieu Othacehe's message of "Thu, 22 Oct 2020 13:49:43 +0200") Message-ID: <87blgo8ufs.fsf@gnu.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.3 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-Spam-Score: -3.3 (---) X-BeenThere: bug-guix@gnu.org List-Id: Bug reports for GNU Guix List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 43850@debbugs.gnu.org Errors-To: bug-guix-bounces+larch=yhetil.org@gnu.org Sender: "bug-Guix" X-Scanner: scn0 Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Spam-Score: -1.51 X-TUID: qepllIhpVkjz Hi, Mathieu Othacehe skribis: >> I have now copied the database to a tmpfs mounted directory to make sure >> that those inconsistent duration are only caused by the I/O pressure on >> berlin. > > This helps a lot. The Cuirass web service has been running smooth since > two days, without any inconsistent query times. Interesting. > I'm considering using a tmpfs backed database for good. The problem is > that we would need a save/restore mechanism in case Berlin > reboots. Hmm sounds risky, no? I wonder if we could instead ensure no I/O-intensive workload runs that machine. I=E2=80=99m thinking in particular of the derivations that produce ISO/qcow images that are not offloaded but maybe should. WDYT? Do you think that=E2=80=99d be enough? Or is tmpfs our only hope? Thanks, Ludo=E2=80=99.