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

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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.

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Message #23 received at 44674 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 44674 <at> debbugs.gnu.org,
 Philipp Stephani <p.stephani2 <at> gmail.com>
Subject: Re: bug#44674: 28.0.50; Adding current-cpu-time for performance tests 
Date: Mon, 16 Nov 2020 11:11:34 +0100

> +The return value is a pair (CPU-TICKS . TICKS-PER-SEC).

Perhaps not ideal to cons in a timing primitive where low overhead is called for.
What about just returning an integer and have a different way to get at TICKS-PER-SEC?
After all, the timer frequency is not specific to each measurement.

Ideally the returned value should be a fixnum to minimise overhead, but it may restrict the range on 32-bit platforms.

I also agree with Phillipp's comment about clock_gettime.
This bug report was last modified 3 years and 107 days ago.

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