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d="scan'208";a="14163908" Received: from unknown (HELO ribbon) ([193.50.110.156]) by mail2-relais-roc.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Jan 2022 10:46:26 +0100 From: =?utf-8?Q?Ludovic_Court=C3=A8s?= To: zimoun Cc: 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?= References: <87fsq0eswh.fsf@inria.fr> <86pmp44kkn.fsf@gmail.com> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 18 =?utf-8?Q?Niv=C3=B4se?= an 230 de la =?utf-8?Q?R?= =?utf-8?Q?=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: Fri, 07 Jan 2022 10:46:25 +0100 In-Reply-To: <86pmp44kkn.fsf@gmail.com> (zimoun's message of "Thu, 06 Jan 2022 22:32:08 +0100") Message-ID: <87o84nc1zi.fsf@inria.fr> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; 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dkim=none; dmarc=none; 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: DFA04123B0 X-Spam-Score: -3.30 X-Migadu-Scanner: scn1.migadu.com X-TUID: +z3sv/kxWGaJ Hello, zimoun skribis: > 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 detrime= ntal 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=99pac= kage-with-tune=E2=80=99 > rewriting the =E2=80=99tune=E2=80=99 properties to all the packages and t= hen run a > world-rebuild. ;-) Heh. :-) > Well, the conscious choice of letting =E2=80=99--tune=E2=80=99 operates o= nly on packages > explicitly marked as =E2=80=9Ctunable=E2=80=9D appears to me a clean desi= gn. 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 = both worlds: as > much as possible reproducible, sacrificing for few corner-cases, keeping > the performance for all. Yeah, I think so. A question that remains: even as a =E2=80=9Cregular user=E2=80=9D on my lap= top, I use things that depend for instance on Eigen. Often Eigen is not critical to the overall performance (and energy efficiency) of those things, but it still plays its part; it would be tempting from that perspective to have =E2=80=98--tune=E2=80=99 turned on by default. I think it=E2=80=99s t= oo early to take that route but might be something to consider in the future. Thanks for your feedback! Ludo=E2=80=99.