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From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Pip Cet <pipcet@gmail.com>
Cc: 46881@debbugs.gnu.org
Subject: bug#46881: 28.0.50; pdumper dumping causes way too many syscalls
Date: Wed, 16 Jun 2021 10:13:01 -0400	[thread overview]
Message-ID: <jwv1r91or0o.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <CAOqdjBehCkGy+Xr4fbkVQMdMmJsEvCGqn3Kmuy00zdBbG1h2Vw@mail.gmail.com> (Pip Cet's message of "Tue, 2 Mar 2021 20:33:42 +0000")

Pip Cet [2021-03-02 20:33:42] wrote:
> Playing around with the WebAssembly port, I noticed that pdumper, in
> creating the dump file, makes way too many syscalls: it uses
> emacs_write(), not fwrite(), so these calls translate to actual
> syscalls and context switches. On immature systems (or in special
> circumstances like a device mounted synchronously),

Thanks for this patch.  For the little story, this inefficiency showed
up on one of my Thinkpads running GNU/Linux with a plain
old ext4 partition mounted in the most standard way (no synchronous
mount or other funny business):

https://serverfault.com/questions/996495/writes-throttled-to-500kb-s

The way this manifested itself is that after some uptime individual
writes to the SSD became very slow.  For most operations, this was
completely invisible, but it was quite noticeable during Emacs's dump
which sometimes took several minutes (while all the rest of the
compilation (including the "load" part of the dump)) progressed at
(apparently) usual speeds.


        Stefan






      parent reply	other threads:[~2021-06-16 14:13 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-02 20:33 bug#46881: 28.0.50; pdumper dumping causes way too many syscalls Pip Cet
2021-03-02 20:45 ` Pip Cet
2021-03-02 21:07   ` Alan Third
2021-03-03  7:10     ` Pip Cet
2021-03-03 19:57       ` Alan Third
2021-03-04  7:25         ` Pip Cet
2021-03-03  5:51   ` Eli Zaretskii
2021-03-03  7:35     ` Pip Cet
2021-03-03 15:09       ` Lars Ingebrigtsen
2021-03-03 19:35       ` Paul Eggert
2021-03-04 22:26     ` Daniel Colascione
2021-03-05  2:30       ` Pip Cet
2021-03-05  7:19         ` Eli Zaretskii
2021-03-05  7:38           ` Pip Cet
2021-03-05  7:54             ` Eli Zaretskii
2021-03-05  9:54               ` Pip Cet
2021-03-05 10:23                 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-05 12:06                 ` Eli Zaretskii
2021-03-05 12:49                   ` Lars Ingebrigtsen
2021-03-05 13:23                     ` Eli Zaretskii
2021-03-05 13:16                   ` Pip Cet
2021-03-05 14:02                     ` Pip Cet
2021-03-05 14:13                       ` Daniel Colascione
2021-03-05 14:55                       ` Eli Zaretskii
2021-03-05 15:12                         ` Pip Cet
2021-03-05  9:35             ` Andreas Schwab
2021-03-05  9:41               ` Pip Cet
2021-06-15  9:25 ` Mattias Engdegård
2021-06-15 12:58   ` Daniel Colascione
2021-06-15 13:06     ` Eli Zaretskii
2021-06-15 13:17       ` Lars Ingebrigtsen
2021-06-15 13:25         ` Daniel Colascione
2021-06-15 13:30           ` Eli Zaretskii
2021-06-15 15:32         ` Mattias Engdegård
2021-06-15 22:44           ` Daniel Colascione
2021-06-16  8:00             ` Mattias Engdegård
2021-06-16  8:14               ` Lars Ingebrigtsen
2021-06-16  8:16               ` Pip Cet
2021-06-16 14:13 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]

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