From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp12.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms0.migadu.com with LMTPS id yDjsF+KF/mG3cQEAgWs5BA (envelope-from ) for ; Sat, 05 Feb 2022 15:12:50 +0100 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp12.migadu.com with LMTPS id yBxcFOKF/mE+1gAAauVa8A (envelope-from ) for ; Sat, 05 Feb 2022 15:12:50 +0100 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 09B6C30820 for ; Sat, 5 Feb 2022 15:12:50 +0100 (CET) Received: from localhost ([::1]:37044 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nGLo1-0005IR-4z for larch@yhetil.org; Sat, 05 Feb 2022 09:12:49 -0500 Received: from eggs.gnu.org ([209.51.188.92]:49244) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nGLnl-0005IH-UX for guix-devel@gnu.org; Sat, 05 Feb 2022 09:12:33 -0500 Received: from hera.aquilenet.fr ([185.233.100.1]:36062) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nGLnj-0003Is-RL for guix-devel@gnu.org; Sat, 05 Feb 2022 09:12:33 -0500 Received: from localhost (localhost [127.0.0.1]) by hera.aquilenet.fr (Postfix) with ESMTP id 05DE221F; Sat, 5 Feb 2022 15:12:30 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at aquilenet.fr Received: from hera.aquilenet.fr ([127.0.0.1]) by localhost (hera.aquilenet.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mt1ieDWSUbur; Sat, 5 Feb 2022 15:12:29 +0100 (CET) Received: from ribbon (91-160-117-201.subs.proxad.net [91.160.117.201]) by hera.aquilenet.fr (Postfix) with ESMTPSA id 11054140; Sat, 5 Feb 2022 15:12:29 +0100 (CET) From: =?utf-8?Q?Ludovic_Court=C3=A8s?= To: Konrad Hinsen Subject: Re: Investigating a reproducibility failure References: <871r0l9fd1.fsf@gmail.com> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 17 =?utf-8?Q?Pluvi=C3=B4se?= an 230 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: Sat, 05 Feb 2022 15:12:28 +0100 In-Reply-To: (Konrad Hinsen's message of "Thu, 03 Feb 2022 10:16:55 +0100") Message-ID: <87tuddh06r.fsf@gnu.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spamd-Bar: ++ X-Rspamd-Server: hera X-Rspamd-Queue-Id: 05DE221F X-Spamd-Result: default: False [2.11 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_CC(0.00)[gmail.com,gnu.org,elephly.net]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; FREEMAIL_ENVRCPT(0.00)[fastmail.net,gmail.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TAGGED_RCPT(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_ALL(0.00)[]; FREEMAIL_TO(0.00)[fastmail.net]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; R_MIXED_CHARSET(0.71)[subject]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; SUSPICIOUS_RECIPS(1.50)[] Received-SPF: softfail client-ip=185.233.100.1; envelope-from=ludo@gnu.org; helo=hera.aquilenet.fr X-Spam_score_int: -11 X-Spam_score: -1.2 X-Spam_bar: - X-Spam_report: (-1.2 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_SOFTFAIL=0.665, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Guix Devel , zimoun Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: "Guix-devel" X-Migadu-Flow: FLOW_IN X-Migadu-Country: US ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1644070370; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post; bh=CSeYjX+ZVLKfzx2pILjxjJOx0AiHqkeC+4gRT7svyzo=; b=YBk2rUFCK0NJxc85AhVCpd1Eg585/y2ok1+QIdtM5rnqgfiLuELmUEoiNRv5QZ+1bCfYve I5UvBDYDO8u7Fb2JatjK44aSXIIGe2xj8sASGjAX+EHcqH6DBJmZizs6K70c/pHbG6tH7O Rgn9ulsxEQFP2howLl1jqKDQWwWXY79xBD2ph65GCKUYwNlU1ZzGrV4CRiQU3D6LQ2lcgG utnLSB5RAQ7z8WCUyX/pm4gIBQhZuYye/dtTt3aF/Wn+jaIa/QVGyRXV5UMX11y8hzTt7J SBtw6pgAPxN1fjoWqmkyyJ+PasFErNukt7+amoUME8pFcNqf3rmwvuoMoNuUJg== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1644070370; a=rsa-sha256; cv=none; b=m/6YOuFNLtsf8aMARsPj7doce3n/Z+OO9sKZ9ATm1yV1I2XBrfQT2gLb+eBligKJPCjgvT Pttk8t6K7iN2Gn6l3zo5R6OJGvvATLCudFKaIRBDQRIao/01eHhpaYyNoQyYolqwGi1nkG I+9txm21d/JhkRF3iZhn1T3gw7QSiRNeu/go9byzOiRyzHCYMwMH0fxAJPL05fPyb9bwzW MSEob7RDdepT2NaWblB7+AIntUZ58cp+z3KJJf9IT6IRKqrvEnt5bPoO5QgYVUpuFKPikx My5l43NXbuTKW2yUUdx3GGIu0zs5PECOoFMzslbULQuhU7Z8IoLHXQvekAEZKw== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=none; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "guix-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-devel-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -3.63 Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "guix-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-devel-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 09B6C30820 X-Spam-Score: -3.63 X-Migadu-Scanner: scn1.migadu.com X-TUID: 6C4sVDk1npC7 Konrad Hinsen skribis: > There is obviously a trade-off between reproducibility and performance > here. I tried hard to dispel that belief: you do not have to trade one for the ot= her. Yes, in some cases scientific software might lack the engineering work that allows for portable performance; but in those cases, there=E2=80=99s =E2=80=98--tune=E2=80=99. https://hpc.guix.info/blog/2022/01/tuning-packages-for-a-cpu-micro-archit= ecture/ We should keep repeating that message: reproducibility and performance are not antithetic. And I really mean it, otherwise fellow HPC practitioners will keep producing unverifiable results on the grounds that they cannot possibly compromise on performance! Thanks, Ludo=E2=80=99.