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 19:28:24 +0200 Message-ID: <83y2j1rz2f.fsf@gnu.org> References: Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="38619"; mail-complaints-to="usenet@ciao.gmane.io" Cc: mattiase@acm.org, p.stephani2@gmail.com, 44674@debbugs.gnu.org To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Nov 16 18:29:11 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 1keiJT-0009vf-1X for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 16 Nov 2020 18:29:11 +0100 Original-Received: from localhost ([::1]:48856 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1keiJR-0003X9-NB for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 16 Nov 2020 12:29:09 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:50748) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1keiJK-0003Wy-Br for bug-gnu-emacs@gnu.org; Mon, 16 Nov 2020 12:29:02 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:45529) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1keiJK-0001oE-0Z for bug-gnu-emacs@gnu.org; Mon, 16 Nov 2020 12:29:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1keiJJ-0006iI-T0 for bug-gnu-emacs@gnu.org; Mon, 16 Nov 2020 12:29:01 -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 17:29:01 +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=B44674.160554772125778 (code B ref 44674); Mon, 16 Nov 2020 17:29:01 +0000 Original-Received: (at 44674) by debbugs.gnu.org; 16 Nov 2020 17:28:41 +0000 Original-Received: from localhost ([127.0.0.1]:57075 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1keiIz-0006hh-5D for submit@debbugs.gnu.org; Mon, 16 Nov 2020 12:28:41 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:50580) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1keiIx-0006hU-Io for 44674@debbugs.gnu.org; Mon, 16 Nov 2020 12:28:39 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:37440) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1keiIr-0001fN-MN; Mon, 16 Nov 2020 12:28:33 -0500 Original-Received: from [176.228.60.248] (port=2997 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1keiIq-0007NG-AH; Mon, 16 Nov 2020 12:28:33 -0500 In-Reply-To: (message from Stefan Monnier on Mon, 16 Nov 2020 10:27:29 -0500) 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:193449 Archived-At: > From: Stefan Monnier > Cc: Eli Zaretskii , 44674@debbugs.gnu.org, Philipp Stephani > > Date: Mon, 16 Nov 2020 10:27:29 -0500 > > > AFAIU, using 'clock' here is not the best idea, as there are caveats wrt to > > calling 'system', and the origin of the returned value is not well defined > > to be portable. > > What do you mean by "origin" and by "calling 'system'"? Quoting https://pubs.opengroup.org/onlinepubs/9699919799/: 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?