From: Ken Brown <kbrown@cornell.edu>
To: Eli Zaretskii <eliz@gnu.org>
Cc: yamaoka@jpl.org, 51734@debbugs.gnu.org
Subject: bug#51734: 29.0.50; got slow
Date: Fri, 12 Nov 2021 13:22:28 -0500 [thread overview]
Message-ID: <f611985c-534b-d33b-72e9-5d1d3fb75269@cornell.edu> (raw)
In-Reply-To: <83mtmazay6.fsf@gnu.org>
On 11/11/2021 3:36 PM, Eli Zaretskii wrote:
> LGTM, thanks. It would be good to understand why starting alarms
> causes slowdown on Cygwin, though.
I asked on the cygwin-developers list, and Corinna is not aware of any reason
there should be a problem using timerfd and POSIX timers simultaneously. [In
case it wasn't clear, the slowdown occurs only if we use both timerfd and
alarms; either one by itself is fine.]
The only thing I can think of is that Cygwin is probably the only system that
has timerfd and that also has to use timers to poll for input. (The others all
use SIGIO, if I'm not mistaken.) By using two different kinds of timers
simultaneously, we're getting timers expiring twice as often and not at regular
intervals. Could this account for the slowdown?
In any case, I think I should go ahead and install the patch to make the master
branch usable again on Cygwin.
Ken
next prev parent reply other threads:[~2021-11-12 18:22 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-10 0:36 bug#51734: 29.0.50; got slow Katsumi Yamaoka
2021-11-10 12:38 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-11-10 14:08 ` Eli Zaretskii
2021-11-10 12:53 ` Eli Zaretskii
2021-11-11 2:43 ` Katsumi Yamaoka
2021-11-11 8:09 ` Eli Zaretskii
2021-11-11 12:02 ` Katsumi Yamaoka
2021-11-11 14:15 ` Eli Zaretskii
2021-11-11 18:11 ` Ken Brown
2021-11-11 18:33 ` Ken Brown
2021-11-11 18:42 ` Eli Zaretskii
2021-11-11 19:28 ` Ken Brown
2021-11-11 20:17 ` Ken Brown
2021-11-11 20:20 ` Eli Zaretskii
2021-11-11 20:30 ` Ken Brown
2021-11-11 20:36 ` Eli Zaretskii
2021-11-11 23:45 ` Katsumi Yamaoka
2021-11-12 18:22 ` Ken Brown [this message]
2021-11-12 19:26 ` Eli Zaretskii
2021-11-12 20:06 ` Ken Brown
2021-11-14 1:13 ` Lars Ingebrigtsen
2021-11-14 15:42 ` Ken Brown
2021-11-14 17:58 ` Lars Ingebrigtsen
2021-11-14 19:11 ` Ken Brown
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