GNU bug report logs - #44674
28.0.50; Adding current-cpu-time for performance tests

Previous Next

Package: emacs;

Reported by: Stefan Monnier <monnier <at> iro.umontreal.ca>

Date: Mon, 16 Nov 2020 01:08:01 UTC

Severity: wishlist

Tags: moreinfo

Found in version 28.0.50

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

Full log

Message #77 received at 44674 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: mattiase <at> acm.org, p.stephani2 <at> gmail.com, 44674 <at> debbugs.gnu.org
Subject: Re: bug#44674: 28.0.50; Adding current-cpu-time for performance tests
Date: Mon, 16 Nov 2020 13:41:13 -0500

>> 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?

You only consider differences between measurements.


        Stefan
This bug report was last modified 3 years and 107 days ago.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.