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Thu, 06 Jan 2022 13:35:30 -0800 (PST) From: zimoun To: Ludovic =?utf-8?Q?Court=C3=A8s?= , guix-science@gnu.org Subject: Re: =?utf-8?Q?=E2=80=9CTuning?= packages for a CPU =?utf-8?Q?micr?= =?utf-8?Q?o-architecture=E2=80=9D?= In-Reply-To: <87fsq0eswh.fsf@inria.fr> References: <87fsq0eswh.fsf@inria.fr> Date: Thu, 06 Jan 2022 22:32:08 +0100 Message-ID: <86pmp44kkn.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Host-Lookup-Failed: Reverse DNS lookup failed for 2a00:1450:4864:20::42f (failed) Received-SPF: pass client-ip=2a00:1450:4864:20::42f; envelope-from=zimon.toutoune@gmail.com; helo=mail-wr1-x42f.google.com X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: guix-science@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-science-bounces+larch=yhetil.org@gnu.org Sender: "Guix-Science" X-Migadu-Flow: FLOW_IN X-Migadu-Country: US ARC-Message-Signature: i=1; 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aspmx1.migadu.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=COJVqLHv; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (aspmx1.migadu.com: domain of "guix-science-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-science-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -4.30 Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=COJVqLHv; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (aspmx1.migadu.com: domain of "guix-science-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-science-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: D52873531C X-Spam-Score: -4.30 X-Migadu-Scanner: scn1.migadu.com X-TUID: J5kuKxK1DH1y Hi Ludo, Thanks for this nice blog post! On Thu, 06 Jan 2022 at 17:22, Ludovic Court=C3=A8s wrote: > I=E2=80=99ve found reproducibility to be often depicted as being detrimen= tal to > performance in HPC circles, so this is a contribution to suggest > otherwise. Who knows if an =E2=80=9CHPC fool=E2=80=9D would not write a =E2=80=99packa= ge-with-tune=E2=80=99 rewriting the =E2=80=99tune=E2=80=99 properties to all the packages and the= n run a world-rebuild. ;-) Well, the conscious choice of letting =E2=80=99--tune=E2=80=99 operates onl= y on packages explicitly marked as =E2=80=9Ctunable=E2=80=9D appears to me a clean design= . It makes a an explicit and clear separation between =E2=80=9Cportable-optimized=E2=80= =9D packages (almost all) vs =E2=80=9Cmicro-optimized=E2=80=9D packages. The best of bo= th worlds: as much as possible reproducible, sacrificing for few corner-cases, keeping the performance for all. Cheers, simon