From: Eli Zaretskii <eliz@gnu.org>
To: Philipp Stephani <p.stephani2@gmail.com>
Cc: mattiase@acm.org, 44674@debbugs.gnu.org, monnier@iro.umontreal.ca
Subject: bug#44674: 28.0.50; Adding current-cpu-time for performance tests
Date: Mon, 16 Nov 2020 21:17:02 +0200 [thread overview]
Message-ID: <83h7ppru1d.fsf@gnu.org> (raw)
In-Reply-To: <CAArVCkQCtJFt4rUzXmGjdgo62UZ=A7wc_nEO9TieXYWUvjyzCw@mail.gmail.com> (message from Philipp Stephani on Mon, 16 Nov 2020 19:32:35 +0100)
> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Mon, 16 Nov 2020 19:32:35 +0100
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, Mattias Engdegård <mattiase@acm.org>,
> 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.
next prev parent reply other threads:[~2020-11-16 19:17 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-16 1:07 bug#44674: 28.0.50; Adding current-cpu-time for performance tests Stefan Monnier
2020-11-16 7:13 ` Philipp Stephani
2020-11-16 7:58 ` Eli Zaretskii
2020-11-16 8:18 ` Eli Zaretskii
2020-11-16 11:46 ` Philipp Stephani
2020-11-16 17:17 ` Eli Zaretskii
2020-11-16 18:31 ` Philipp Stephani
2020-11-16 19:12 ` Eli Zaretskii
2020-11-16 22:09 ` Lars Ingebrigtsen
2020-11-16 10:11 ` Mattias Engdegård
2020-11-16 10:40 ` Eli Zaretskii
2020-11-16 10:48 ` Philipp Stephani
2020-11-16 10:53 ` Mattias Engdegård
2020-11-16 17:15 ` Eli Zaretskii
2020-11-16 15:27 ` Stefan Monnier
2020-11-16 16:14 ` Mattias Engdegård
2020-11-16 17:28 ` Eli Zaretskii
2020-11-16 17:38 ` Eli Zaretskii
2020-11-16 17:59 ` Andreas Schwab
2020-11-16 18:27 ` Eli Zaretskii
2020-11-16 18:41 ` Stefan Monnier
2020-11-16 19:22 ` Eli Zaretskii
2020-11-16 18:32 ` Philipp Stephani
2020-11-16 19:17 ` Eli Zaretskii [this message]
2020-11-16 20:10 ` Stefan Monnier
2020-11-16 18:41 ` Stefan Monnier
2020-11-16 18:39 ` Philipp Stephani
2020-11-16 19:07 ` Stefan Monnier
2020-11-16 17:13 ` Eli Zaretskii
2020-11-16 19:15 ` Mattias Engdegård
2022-04-26 13:55 ` Lars Ingebrigtsen
2022-04-26 15:13 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-04-27 13:09 ` Lars Ingebrigtsen
2022-04-27 17:14 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-04-27 17:20 ` Lars Ingebrigtsen
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