From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#44674: 28.0.50; Adding current-cpu-time for performance tests Date: Mon, 16 Nov 2020 21:17:02 +0200 Message-ID: <83h7ppru1d.fsf@gnu.org> References: <83y2j1rz2f.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="32493"; mail-complaints-to="usenet@ciao.gmane.io" Cc: mattiase@acm.org, 44674@debbugs.gnu.org, monnier@iro.umontreal.ca To: Philipp Stephani Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Nov 16 20:37:24 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kekJY-0008Ma-3M for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 16 Nov 2020 20:37:24 +0100 Original-Received: from localhost ([::1]:38232 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kekJX-0004TA-34 for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 16 Nov 2020 14:37:23 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49040) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kek0o-0001HU-PR for bug-gnu-emacs@gnu.org; Mon, 16 Nov 2020 14:18:02 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:45788) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kek0o-0004de-Fx for bug-gnu-emacs@gnu.org; Mon, 16 Nov 2020 14:18:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1kek0o-0003CN-CL for bug-gnu-emacs@gnu.org; Mon, 16 Nov 2020 14:18:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 16 Nov 2020 19:18:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 44674 X-GNU-PR-Package: emacs Original-Received: via spool by 44674-submit@debbugs.gnu.org id=B44674.160555423712221 (code B ref 44674); Mon, 16 Nov 2020 19:18:02 +0000 Original-Received: (at 44674) by debbugs.gnu.org; 16 Nov 2020 19:17:17 +0000 Original-Received: from localhost ([127.0.0.1]:57324 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kek05-0003B3-3b for submit@debbugs.gnu.org; Mon, 16 Nov 2020 14:17:17 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:48288) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kek03-0003Am-4L for 44674@debbugs.gnu.org; Mon, 16 Nov 2020 14:17:15 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:39130) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kejzx-0004LI-Tr; Mon, 16 Nov 2020 14:17:09 -0500 Original-Received: from [176.228.60.248] (port=1913 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kejzw-0007t5-O0; Mon, 16 Nov 2020 14:17:09 -0500 In-Reply-To: (message from Philipp Stephani on Mon, 16 Nov 2020 19:32:35 +0100) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:193466 Archived-At: > From: Philipp Stephani > Date: Mon, 16 Nov 2020 19:32:35 +0100 > Cc: Stefan Monnier , Mattias Engdegård , > 44674@debbugs.gnu.org > > > The clock() function shall return the implementation's best > > approximation to the processor time used by the process > > since the beginning of an implementation-defined era > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > related only to the process invocation. > > > > How do you write portable Lisp code that returns consistent results > > based on such shaky foundations? > > For non-walltime clocks, only the difference between two measurements > is meaningful. Which is a limitation, when compared to APIs that always measure since the program/thread start. For example, with 'clock' you cannot measure how long the startup takes.