From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Robert Pluim Newsgroups: gmane.emacs.devel Subject: Re: string_char_to_byte and string_byte_to_char micro-optimisation Date: Mon, 17 Jun 2019 11:37:15 +0200 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="200602"; mail-complaints-to="usenet@blaine.gmane.org" Cc: emacs-devel@gnu.org To: Paul Eggert Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Jun 17 11:37:41 2019 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hco57-000q3f-FY for ged-emacs-devel@m.gmane.org; Mon, 17 Jun 2019 11:37:41 +0200 Original-Received: from localhost ([::1]:45582 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hco56-0004gO-HF for ged-emacs-devel@m.gmane.org; Mon, 17 Jun 2019 05:37:40 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57700) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hco4m-0004gI-0Z for emacs-devel@gnu.org; Mon, 17 Jun 2019 05:37:20 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hco4l-0008N0-0F for emacs-devel@gnu.org; Mon, 17 Jun 2019 05:37:19 -0400 Original-Received: from mail-ed1-x534.google.com ([2a00:1450:4864:20::534]:38183) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hco4k-0008MQ-Ks for emacs-devel@gnu.org; Mon, 17 Jun 2019 05:37:18 -0400 Original-Received: by mail-ed1-x534.google.com with SMTP id r12so13015699edo.5 for ; Mon, 17 Jun 2019 02:37:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:references:mail-followup-to:mail-copies-to :gmane-reply-to-list:date:message-id:mime-version :content-transfer-encoding; bh=NgItkn/9lcyc2HFMnaxFJYyNfsTXs42/1UpKwNNxu/4=; b=Vkr52Y/Gzo37sq5KF/9hkCdtTRjnkJeTQymJElXVGVmICuCVrBDAt6fGvyKze160N2 0SnIw53FrznH+MtliBB/uVyn40jHPk4w8RCRWYJPjCv1znrgweuvXTWFoOtog/J6GEfB T9P7UYnV8KlbRdsxI9rMg4qWpPKzBRQRB21kHM0lIC9/9TMmXVNiw3UhaNkBrG0JbJTt yQGcPzrB84+DKrBOq6CsjTau0pF9RkNRfWcPIb70bQnTyM+9Kr1aEa3JYHMOFpn4RkSj Ok33uhnmsFacNl12EXaY6f8B2Mq9pP69iWxP7dWcEGGN+V+HGDAbOHYEkbnnhBcietcL NbAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:references:mail-followup-to :mail-copies-to:gmane-reply-to-list:date:message-id:mime-version :content-transfer-encoding; bh=NgItkn/9lcyc2HFMnaxFJYyNfsTXs42/1UpKwNNxu/4=; b=IxyJuiYgE2yeGZju8jYVnaCQxyISWPSGu9er35M3+dHYkZJ3q6C3nKesNOxEJYexfG iNeRg7CNacY86KERmd+yyCyzPFVO2iiqDiKJN1ujaE948ysNFgzT0V56kvtNXOqbvEva 3P+1LCrACRdnwjfJA5bzvhzBuHUcciGkg93v9mGqZQwrE3Wyz4seGLEyN0NNTlDQfdQM CXAnjw1UI4cUXPGGhUUPMN1y/+qHUIdfqjktxf3VL9QB1zTYXihiMc1pIUQ6yoqf6qIR VZyAH8nVIfec2AT6E4tVfsRJdpciBZEah/dPHi/FsYfuZgitpRhl8zVS2J59bUeR+xsO kaAw== X-Gm-Message-State: APjAAAXuJFobTpUBAkWC0GA0L5zYSlywtyYQMobUSJVTwarHXpdVSF0Z TAyXOH6L3YFD1GrHtvMcAbuY5jkw06g= X-Google-Smtp-Source: APXvYqxbhZcAFv6K8rkVamh2TE74bZk+WrbtnRb02DOcSTMxdSnJajn8lOSx+aW5kniH/2ABhRZLyQ== X-Received: by 2002:a17:906:a2d2:: with SMTP id by18mr33257500ejb.245.1560764236920; Mon, 17 Jun 2019 02:37:16 -0700 (PDT) Original-Received: from rpluim-mac ([149.5.228.1]) by smtp.gmail.com with ESMTPSA id k21sm2020151ejk.86.2019.06.17.02.37.15 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 17 Jun 2019 02:37:16 -0700 (PDT) Mail-Followup-To: emacs-devel@gnu.org Mail-Copies-To: never Gmane-Reply-To-List: yes X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::534 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:237768 Archived-At: >>>>> On Fri, 14 Jun 2019 09:53:50 -0700, Paul Eggert = said: Paul> On 6/14/19 5:37 AM, Robert Pluim wrote: >> What I don=CA=BCt have is any intuition on whether such a change act= ually >> makes any difference in real-world Emacs usage. Can anyone suggest a= ny >> benchmarks? Paul> My usual benchmark for this sort of thing is 'make compile-always= ' in Paul> the lisp directory. It doesn=CA=BCt make a significant difference, so I don=CA=BCt think there= =CA=BCs any point in complicating the code: With patch, run 1: real 4m21.097s user 3m39.020s sys 0m33.267s With patch, run 2: real 4m13.649s user 3m34.102s sys 0m31.834s Without patch, run 1: real 4m15.264s user 3m34.305s sys 0m32.719s Without patch, run 2: real 4m18.266s user 3m36.531s sys 0m33.315s