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 ms0.migadu.com with LMTPS id aPjUJFR1r2H3FgAAgWs5BA (envelope-from ) for ; Tue, 07 Dec 2021 15:53:08 +0100 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 yAxqIFR1r2G8UAAAB5/wlQ (envelope-from ) for ; Tue, 07 Dec 2021 14:53:08 +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 5408731BA for ; Tue, 7 Dec 2021 15:53:08 +0100 (CET) Received: from localhost ([::1]:58906 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mubq7-0005DE-HD for larch@yhetil.org; Tue, 07 Dec 2021 09:53:07 -0500 Received: from eggs.gnu.org ([209.51.188.92]:35326) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mubq2-0005Cq-Aq for guix-patches@gnu.org; Tue, 07 Dec 2021 09:53:02 -0500 Received: from debbugs.gnu.org ([209.51.188.43]:53650) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mubq2-0007Af-2V for guix-patches@gnu.org; Tue, 07 Dec 2021 09:53:02 -0500 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1mubq1-0001Ks-RU for guix-patches@gnu.org; Tue, 07 Dec 2021 09:53:01 -0500 X-Loop: help-debbugs@gnu.org Subject: [bug#52283] [PATCH 02/10] transformations: Add '--tune'. Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= Original-Sender: "Debbugs-submit" Resent-CC: guix-patches@gnu.org Resent-Date: Tue, 07 Dec 2021 14:53:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 52283 X-GNU-PR-Package: guix-patches X-GNU-PR-Keywords: patch To: zimoun Cc: 52283@debbugs.gnu.org, Thiago Jung Bauermann Received: via spool by 52283-submit@debbugs.gnu.org id=B52283.16388887805126 (code B ref 52283); Tue, 07 Dec 2021 14:53:01 +0000 Received: (at 52283) by debbugs.gnu.org; 7 Dec 2021 14:53:00 +0000 Received: from localhost ([127.0.0.1]:36963 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mubq0-0001Kc-21 for submit@debbugs.gnu.org; Tue, 07 Dec 2021 09:53:00 -0500 Received: from mail2-relais-roc.national.inria.fr ([192.134.164.83]:9369) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mubpu-0001K7-Ls for 52283@debbugs.gnu.org; Tue, 07 Dec 2021 09:52:58 -0500 IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23: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 X-IronPort-AV: E=Sophos;i="5.87,293,1631570400"; d="scan'208";a="9135039" Received: from unknown (HELO ribbon) ([193.50.110.120]) by mail2-relais-roc.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Dec 2021 15:52:46 +0100 From: Ludovic =?UTF-8?Q?Court=C3=A8s?= References: <20211204204924.15581-1-ludo@gnu.org> <20211204204924.15581-2-ludo@gnu.org> <7364829.rrRS6mQaNJ@popigai> <871r2olu1j.fsf@inria.fr> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 17 Frimaire 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: Tue, 07 Dec 2021 15:52:44 +0100 In-Reply-To: (zimoun's message of "Tue, 7 Dec 2021 11:32:25 +0100") Message-ID: <875ys0jwlf.fsf@inria.fr> 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-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: guix-patches@gnu.org List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-patches-bounces+larch=yhetil.org@gnu.org Sender: "Guix-patches" X-Migadu-Flow: FLOW_IN X-Migadu-Country: US ARC-Message-Signature: i=1; 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aspmx1.migadu.com; dkim=none; dmarc=none; spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -3.14 Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=none; spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 5408731BA X-Spam-Score: -3.14 X-Migadu-Scanner: scn0.migadu.com X-TUID: s/yL4piXk9fD zimoun skribis: > On Tue, 7 Dec 2021 at 09:06, Ludovic Court=C3=A8s wrote: > >> The reason the test suite is skipped is because we cannot know for sure >> whether the machine that hosts the daemon is able to run code for this >> specific micro-architecture. > > Naive question: is it possible to effectively run it via emulation? Not to my knowledge. >> The test suite runs in the =E2=80=9Cbaseline=E2=80=9D package build anyw= ay, so assuming >> the compiler works fine, skipping the test suite on tuned builds is >> okay. > > I miss if the test suite is effectively run somewhere? Yes, for the default/generic/baseline package, when not using =E2=80=98--tu= ne=E2=80=99. > And "baseline" package build means the package built for generic > architecture, right? Correct. > My questions are coming from Julia packages in mind, where the test > suite is the only way to know all is fine. And many times, add System > Image for Julia had been discussed and basically this System Image is > precompilation (generic one or specialized for micro-architecture). > Therefore, maybe this new 'tune' transformation would fit the bill. > :-) > > https://docs.julialang.org/en/v1/devdocs/sysimg/ According to this page, =E2=80=98--tune=E2=80=99 won=E2=80=99t be necessary= here because Julia supports function multi-versioning for its =E2=80=9Csystem image=E2=80=9D: The system image can be compiled simultaneously for multiple CPU microarchitectures under the same instruction set architecture (ISA). Multiple versions of the same function may be created with minimum dispatch point inserted into shared functions in order to take advantage of different ISA extensions or other microarchitecture features. The version that offers the best performance will be selected automatically at runtime based on available CPU features. I guess we should follow the instructions at to build a system image that contains multiple versions of each function. Thanks, Ludo=E2=80=99.