From owner-freebsd-hackers@freebsd.org Fri Jan 4 11:02:33 2019 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 3E8BF1425E4E for ; Fri, 4 Jan 2019 11:02:33 +0000 (UTC) (envelope-from unledev@gmail.com) Received: from mail-qt1-x831.google.com (mail-qt1-x831.google.com [IPv6:2607:f8b0:4864:20::831]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 5CF0E8B30E for ; Fri, 4 Jan 2019 11:02:32 +0000 (UTC) (envelope-from unledev@gmail.com) Received: by mail-qt1-x831.google.com with SMTP id l11so39987792qtp.0 for ; Fri, 04 Jan 2019 03:02:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=hDoD4rmA6MgF9sxWF6llqsR8QC2QYU3lUQv78IO+tGc=; b=SpGdRwVrrspAX83OMhurIngReWUCptshdZzpHB8++7a5bdtrjirYoSBpoqhcitfzSb VbeYlCO9VLdSY7stKjhnP2IGK0whB5orWG0ldyxDQhx/LxPyN96xnGiT//YvpYweXJn0 6RNIbfMPhvlxB695nsmAUzzCgZkoORbiboe3XU/R63jqtLJl8QHVTjRFIHquYb9Y6C0r 3cUjLH0KUjnRpRgvuRJQLFonipt/0UjNuzUCyAcF2OZ2D2bzMDO9a3Dc7RQMvOET7B6q TNgvlevORwe3MFfTwIrwXC768buKjFq/we0XEpBTPZoUd9a7sG9tHpVHJKyirEa239PS Jpfw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=hDoD4rmA6MgF9sxWF6llqsR8QC2QYU3lUQv78IO+tGc=; b=lrMwm8/4i8SQ5J2skuX3lX9zTuLotwEPY5RMGifqVmU5dTGEqcUcyXw/ojsnEP5zNL bPc04a4s3NWpL/KCDkyaNwT6a4ARgT57qWqb/K4QxI8tdQJ1Or0ny7GCJ0HLvSwqdXJG 7isNMMKkU3z6O4PCV5kZkMvILycWt2rUjvuNicuWYGfzGBCQKo8FgI/dbeX1LRGtg4HZ dIcQjNUMohqaqh68hqKIYp3QQ6aWMMFUxBndho5wV39xpYChV/0BVzPUw1AIl6QaMlsb Cl6obHrRoNT8Ztns2eJR0jQEkezZpSvEF/8COpkyfFmuae6gYX5z7USrIB1CyyIsLzcF ubrw== X-Gm-Message-State: AJcUukdG2/uy/RpbpFMKhgtx7G+rfOMTMx43GQUwACSg1jGHkdKsj8Fu 3R6BogMBCjkX4s3pe8R++sC9gtfBEYE9rmB6RmU= X-Google-Smtp-Source: ALg8bN6LROuHIZSPJYxNYkXPXGtHewhtvnaW2etQRihrYgdahN0xg8q9vr7umHXnm/OoCj1de0XzsGvUR9U+FzWxf0Y= X-Received: by 2002:a0c:b48d:: with SMTP id c13mr49164974qve.91.1546599751893; Fri, 04 Jan 2019 03:02:31 -0800 (PST) MIME-Version: 1.0 References: <7d7bc47d-04cf-2f9b-00a3-e3d9d92b3623@aceshardware.com> <72922F2C-9D27-47AA-BB1C-2DA8589CF008@rpi.edu> <92bd5362-d898-aa12-8f3d-9fbe23f38e0c@aceshardware.com> In-Reply-To: <92bd5362-d898-aa12-8f3d-9fbe23f38e0c@aceshardware.com> From: Alejandro Martinez Date: Fri, 4 Jan 2019 11:02:18 +0000 Message-ID: Subject: Re: Speculative: Rust for base system components To: Brian Neal Cc: Garance A Drosehn , freebsd-hackers@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 5CF0E8B30E X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=SpGdRwVr; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of unledev@gmail.com designates 2607:f8b0:4864:20::831 as permitted sender) smtp.mailfrom=unledev@gmail.com X-Spamd-Result: default: False [-6.45 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[1.3.8.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; RCVD_TLS_LAST(0.00)[]; NEURAL_HAM_SHORT(-0.86)[-0.859,0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; IP_SCORE(-2.59)[ip: (-9.02), ipnet: 2607:f8b0::/32(-2.17), asn: 15169(-1.65), country: US(-0.08)]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Jan 2019 11:02:33 -0000 Hi Brian, On Tue, Jan 1, 2019 at 7:02 AM Brian Neal wrote: > > It was a debug build with no optimization for either compiler. But we > can easily run a variety of settings for comparison: > > Compiler Flags Inst. Count Build Time > ====================================================================== > clang 7.0.0 none 33 296ms > -O3 23 341ms > rustc 1.31.0 none 110 606ms > -C opt-level=3 67 643ms > gcc 8.2 none 37 211ms > -O2 24 249ms > -O3 119* 206ms > > * With -O3, gcc unrolled and vectorized the loop. The other compilers > did not emit vectorized code at any of the standard optimization levels. > > So, essentially, double the build time and ~3 times the code for the > same logic. Can you share your exact tests so others can replicate? Thanks, Alex