From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp0 ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms0.migadu.com with LMTPS id SD1bFU8y22CwUgEAgWs5BA (envelope-from ) for ; Tue, 29 Jun 2021 16:46:39 +0200 Received: from aspmx1.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp0 with LMTPS id gHMjEU8y22AvWAAA1q6Kng (envelope-from ) for ; Tue, 29 Jun 2021 14:46:39 +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 B96DF20CFA for ; Tue, 29 Jun 2021 16:46:38 +0200 (CEST) Received: from localhost ([::1]:40230 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lyF0X-0005yF-Bz for larch@yhetil.org; Tue, 29 Jun 2021 10:46:37 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57870) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lyEsi-0000I5-OS for guix-devel@gnu.org; Tue, 29 Jun 2021 10:38:32 -0400 Received: from mail3-relais-sop.national.inria.fr ([192.134.164.104]:14658) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lyEsg-0006rc-5S for guix-devel@gnu.org; Tue, 29 Jun 2021 10:38:32 -0400 IronPort-HdrOrdr: =?us-ascii?q?A9a23=3AcxVrHqhGMMKH48z/s7Cw0Utn5HBQXs8ji2hC?= =?us-ascii?q?6mlwRA09TyX4raGTdZsgpHzJYVoqM03I+urvBEDjex/hHPdOiOEs1NGZNjUO01?= =?us-ascii?q?HGEGgN1+bf6gylMSv46+ZWyONBfsFFaOHNMQ=3D=3D?= X-IronPort-AV: E=Sophos;i="5.83,309,1616454000"; d="scan'208";a="386526087" Received: from 91-160-117-201.subs.proxad.net (HELO ribbon) ([91.160.117.201]) by mail3-relais-sop.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Jun 2021 16:38:25 +0200 From: =?utf-8?Q?Ludovic_Court=C3=A8s?= To: Eric Brown Subject: Re: LAPACK vs. OpenBLAS References: <87wnqjs9qv.fsf@inria.fr> <87k0mj71eu.fsf@ericcbrown.com> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 11 Messidor 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: Tue, 29 Jun 2021 16:38:24 +0200 In-Reply-To: <87k0mj71eu.fsf@ericcbrown.com> (Eric Brown's message of "Thu, 24 Jun 2021 10:00:41 -0500") Message-ID: <87im1wrb1b.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 Received-SPF: pass client-ip=192.134.164.104; envelope-from=ludovic.courtes@inria.fr; helo=mail3-relais-sop.national.inria.fr X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.23 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 Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: "Guix-devel" X-Migadu-Flow: FLOW_IN ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1624977998; 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=0JiyVje3FEy/f9/y0MM4hy13zwrejufPQ0Lh5Jissuo=; b=SEF9qSHNGE7Mq2hO6MpCTOMSCAfWOJIObwogdDc372w8vXRb2ZwT81SiMKv1aj8Eg13ZMW nYTiY81zy0o1UUO/PZ721rAkOd5c2dxZnKH8KusfukBemunkUQ8o33Y9zWSJCj6ZMtND5e qjWNQvOZEGZvE3J3RWiIeOVph90/9wB02nZ8h8o9gmJBeo5/jM3xGcPHZc54XiSc/E8p8H JKch92QtnOFn1/BPnCF9ltzomGIcb4KaH+weYHiH4KB+t10pfpUt/+efZTCT+htqlmUU8l 1a1hZpyxgc6hYoPRhyBklGeBS6fRV5KYd9e1R6ug6HMjF/FBr5VG0GfznzStgg== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1624977998; a=rsa-sha256; cv=none; b=jTDVRR5sbr6g/8CbecZRXFfwEhs10OLN0NQ/NoIG4k5/P3FA9/tI/A+QBtXouJz44A0Gjw +hh2knbagrK8AaTjn5+I+m9k29psL1cbvC8v7ealxvCnP83B+7S8NKIsTtUeQ/FLyLG9yW rhA6G4IVh1sHGA76Tdgw9uCZq2amQKAgK9ixkzz9HrchmdNPVi/UXliLsG33cqjGcPO2Ck 8IgIkHgNDsMD7mWyccLaxOE9jlbYarXzqaD1Fn/U/kRJPWAKlrTS4YNsi2yFl9sWYGkqpS SrbJKbEyN3fxQO5+9pwug7H/oO+BAcBDvpYNfN6QZgyOsA2PL/+nJzdZqQ+Ufg== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=none; spf=pass (aspmx1.migadu.com: domain of guix-devel-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-devel-bounces@gnu.org X-Migadu-Spam-Score: -2.42 Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=none; spf=pass (aspmx1.migadu.com: domain of guix-devel-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-devel-bounces@gnu.org X-Migadu-Queue-Id: B96DF20CFA X-Spam-Score: -2.42 X-Migadu-Scanner: scn0.migadu.com X-TUID: eEQwQXzvdDa8 Hi Eric, Eric Brown skribis: > There are scenarios where reference BLAS is more stable and/or > reproducible than optimized BLAS libraries. Sometimes its lack of > knowledge of OpenBLAS and/or a numerical issue. > > (cf. GNU R's discussion of which BLAS to use.) Do you have a pointer to that discussion? Are there other cases where netlib BLAS is considered more appropriate than OpenBLAS because it=E2=80=99s more numerically stable? Thanks for your feedback, Ludo=E2=80=99.