From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: John Wiegley Newsgroups: gmane.emacs.devel Subject: Re: Should we land Lisp reader optimizations? Date: Wed, 21 Jun 2017 23:25:41 -0700 Message-ID: References: <83y3snx6b7.fsf@gnu.org> <56EA228B-387F-4983-A91E-97ACFE56F42F@raeburn.org> <83a852wuk0.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1498112765 31593 195.159.176.226 (22 Jun 2017 06:26:05 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 22 Jun 2017 06:26:05 +0000 (UTC) User-Agent: Gnus/5.130016 (Ma Gnus v0.16) Emacs/25.2.50 (darwin) Cc: Eli Zaretskii , Ken Raeburn , rms@gnu.org, emacs-devel@gnu.org To: michael schuldt Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Jun 22 08:25:55 2017 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNvYx-0007h7-8f for ged-emacs-devel@m.gmane.org; Thu, 22 Jun 2017 08:25:55 +0200 Original-Received: from localhost ([::1]:57232 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dNvZ2-00025q-62 for ged-emacs-devel@m.gmane.org; Thu, 22 Jun 2017 02:26:00 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:52044) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dNvYw-00025a-AN for emacs-devel@gnu.org; Thu, 22 Jun 2017 02:25:55 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dNvYv-00071k-GR for emacs-devel@gnu.org; Thu, 22 Jun 2017 02:25:54 -0400 Original-Received: from mail-pf0-x229.google.com ([2607:f8b0:400e:c00::229]:35560) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dNvYr-000715-Gs; Thu, 22 Jun 2017 02:25:49 -0400 Original-Received: by mail-pf0-x229.google.com with SMTP id c73so4453897pfk.2; Wed, 21 Jun 2017 23:25:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:in-reply-to:date:message-id:references :user-agent:mail-followup-to:mime-version; bh=RwvitGcCgTAJEQnL/s13MOmRftYLh4E2CnGIooXkWxQ=; b=FV8zaMhqIFtu7dcikAinOyl+/PhnalzITntLEmORgnmgrS+okSj82r7Y28ufhOjTJ/ XEG2pJuw30B9tRzGmvD6AOeWPiPJq5yLDncpvWIpEpQk9r6wHOoa8QPL/gaq2RzZxgtF hO+d/pPOb4uPWbXVMgbE1rispL1FWzDk3IoVwyjQXp5GXfRgONA1pPQanYt52Xe4Id5P NPSiwut7z7d8PV5dPuHaVTE9Xif1F2TbtLY41b/eSzSu0ONzZ6qQPadu/0uwNjQd6d4d 4//2OUEF8OjpS5Gae8zAkk4bwS73abohDq1p5crpcwMYLTfYPIOiqAAls8rOrXpdn0bI NS7w== 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:in-reply-to:date:message-id :references:user-agent:mail-followup-to:mime-version; bh=RwvitGcCgTAJEQnL/s13MOmRftYLh4E2CnGIooXkWxQ=; b=ngKEGN2F3E7Noo/LHtD6ncrO2g2qGurmskmzAz5S9Awz+mK9HxscnWJdSu+STRXtid XGb3o3i8JzUt55Sw4WQ/AW8L9wYh4DtgQLAUxZgCZ1GyJ2z89gnEbYRIjm75mykGreld 7Fgnovr9k1XnoQaBumPtSAHbH75vBOFm67QH4rwrcyF+2q99+8YgfFoFJN0eqMy+u/KP r63vcxh0hNgpQo7iictxTI+gAGJv7OENYz8032Z0odYgp0I8TxrR8D9tvLyGqPRaOMi2 J4R/HF34F3GfKILO2H7dmyFOYVL8xMNGGDALAK0+Py/QNvZ5VjoaqpgoejinrWeW8gRx cgWQ== X-Gm-Message-State: AKS2vOyiZ44q7/S0PTEfojBHxVYgq//mCsqtl55eW1ZBO/A8tJB4SQ/z 0xuPhb9VFGQnjw== X-Received: by 10.84.217.152 with SMTP id p24mr1165725pli.276.1498112746695; Wed, 21 Jun 2017 23:25:46 -0700 (PDT) Original-Received: from Vulcan.local (76-234-69-149.lightspeed.frokca.sbcglobal.net. [76.234.69.149]) by smtp.gmail.com with ESMTPSA id a84sm1448985pfe.19.2017.06.21.23.25.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 21 Jun 2017 23:25:45 -0700 (PDT) X-Google-Original-From: "John Wiegley" Original-Received: by Vulcan.local (Postfix, from userid 501) id 241996022957; Wed, 21 Jun 2017 23:25:44 -0700 (PDT) In-Reply-To: (michael schuldt's message of "Wed, 21 Jun 2017 19:56:06 -0700") Mail-Followup-To: michael schuldt , rms@gnu.org, Eli Zaretskii , Ken Raeburn , emacs-devel@gnu.org X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:400e:c00::229 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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:215876 Archived-At: >>>>> "ms" == michael schuldt writes: ms> But in either case Ken seems to make it clear that it does not really ms> matter - GC overhead is small when reading normal files and already ms> minimized for the big .elc read And in fact, the GC can make things faster, by quickly freeing temporarily allocated memory that can be reused in a subsequent loop iteration. Although it does take "work" to walk the heap and free objects, sometimes this work is less than freshly allocating new temporary blocks at ever-new places on the heap. -- John Wiegley GPG fingerprint = 4710 CF98 AF9B 327B B80F http://newartisans.com 60E1 46C4 BD1A 7AC1 4BA2