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Date: Fri, 05 Feb 2021 17:10:46 +0100
From: mail@HIDDEN
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#46326: 27.1.50; Excessive memory allocations with
minibuffer-with-setup-hook
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Hello Eli!
> If you are saying that the Lisp code in question conses too many
> objects unnecessarily, then the solution is to modify the code to cons
> less objects. That doesn't necessarily indicates the existence of a
> bug in Emacs, certainly not with its memory management.
My code certainly *does not allocate* too much. It is the add-hook
implementation
or more precisely the minibuffer-with-setup-hook implementation which is
responsible for the excessive allocations. For this reason this is an
upstream
bug. In my workaround, I am replacing the upstream version of
minibuffer-with-setup-hook
with my own version to show the difference. This does not mean that I
consider
the problem to be gone. I rather decided to report the problem instead.
> So if you already have a solution for the problem, what is it that you
> want us as Emacs maintainers to investigate and fix here?
I am actually not sure what the proper upstream fix is. I see the
following
options.
1. Replace minibuffer-with-setup-hook with my version if you think
my version is better and an acceptable fix.
2. Investigate the reasons why add-hook with priorities somehow copies
large closures during sorting. This is unacceptably costly.
To give you a better picture of the overall situation - it looks like
this:
(minibuffer-with-setup-hook
(lambda () ...large closure...)
(minibuffer-with-setup-hook
(lambda () ...another large closure...)
(minibuffer-with-setup-hook
(:append (lambda () ...and yet another one...))
(completing-read ...))))
The bug is that the large closures are copied for some unknown reason in
the
add-hook calls which I am not controlling as a library author. My
replacement
adds the hooks in another way, by creating a symbol+fset instead of
putting the
lambda directly in the minibuffer-setup-hook variable.
Daniel
bug-gnu-emacs@HIDDEN:bug#46326; Package emacs.
Full text available.
Received: (at 46326) by debbugs.gnu.org; 5 Feb 2021 17:07:16 +0000
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Date: Fri, 05 Feb 2021 16:20:13 +0100
From: mail@HIDDEN
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#46326: 27.1.50; Excessive memory allocations with
minibuffer-with-setup-hook
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Hello Eli,
thank you for your prompt answer!
> Please show information about the memory consumption. (The so-called
> "memory profile" doesn't actually measure memory consumption at all,
> it just uses memory allocation calls as a poor-man's profiling
> signal.)
Yes, I am aware. I am not saying that live memory is the problem, but
the
excessive amount of allocations is a problem, which creates unnecessary
garbage
collector pauses. Therefore I can also not show you a profile of the
memory
consumption, since it is not relevant.
> Please show a recipe starting from "emacs -Q" where a lot of memory is
> being consumed, and please show how much memory does the recipe
> consume. Also, I presume invoking "M-x garbage-collect RET" doesn't
> release that memory? If so, please show the return value of
> garbage-collect.
I hope it is not asking too much to load a single elisp file
(consult.el)? The
package file has no further dependencies besides Emacs. Then I can give
you the
following reproducible. The only difference between the two files is
that in one
case minibuffer-with-setup-hook is used and in the other case
consult--minibuffer-with-setup-hook is used. I appended the two files.
The hashes
correspond to the git commit hashes in case you want to pull the files
from the
git repository.
;; excessive allocations - using minibuffer-with-setup-hook
(load "consult-2a197310923a732033bdb757b20c6f90cfad784a.el")
;; no suspicious allocations - using
consult--minibuffer-with-setup-hook
;;(load "consult-27e055e7c75e2148449e7b0be4d464b03c36a1bd.el")
(profiler-start 'mem)
(dotimes (count 100)
(run-at-time 0 nil (lambda ()
(message "%s" count)
(setq unread-command-events '(?\C-g))))
(condition-case _
(consult-buffer)
(quit)))
(profiler-stop)
(profiler-report)
>> See the issue https://github.com/minad/consult/issues/193 for
>> reference.
>
> I don't see any memory information in that discussion. I guess you
> thought the memory profiler somehow shows memory consumption, but it
> doesn't.
The profile in the issue shows the memory allocation profile. I think
you refer
to my comment
https://github.com/minad/consult/issues/193#issuecomment-770416491,
where I
stated my confusion, since the creator of the issue talked about "memory
usage".
I was only wondering what the profiler actually measures and I looked
into the
profiler code to confirm that it indeed measures allocations.
> What exactly caused you to run the profiler? is the code slow or
> something? If so, the problem may be something other than memory
> consumption.
Yes, it is slow. Add-hook performs unnecessary allocations causing
pauses. After
replacing the minibuffer-with-setup-hook default implementation with my
workaround the memory allocations went away and the command is much
faster. The
add-hook calls do not appear in the memory profile anymore. See the
comment
https://github.com/minad/consult/issues/193#issuecomment-770650405.
56,846,572 89% - consult-buffer
56,846,572 89% - consult--buffer
56,846,572 89% - consult--multi
53,076,020 83% - consult--read
53,076,020 83% - apply
53,076,020 83% - #<compiled -0x1bf0d3486ff553f9>
53,076,020 83% - consult--with-async-1
53,076,020 83% - #<compiled 0x3e0275e58912bf7>
53,076,020 83% - consult--with-preview-1
53,074,964 83% - #<compiled -0xbfb98ce1324d29c>
53,074,964 83% - completing-read
53,074,964 83% - selectrum-completing-read
5,530,436 8% + selectrum-read
70,240 0% + consult--multi-candidates
4,360 0% consult--multi-predicate
1,056 0% + consult--multi-preprocess
Daniel Mendler
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--=_8eacb995e016baed37890613fffd2ad6--
bug-gnu-emacs@HIDDEN:bug#46326; Package emacs.
Full text available.Received: (at 46326) by debbugs.gnu.org; 5 Feb 2021 15:58:31 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Feb 05 10:58:31 2021 Received: from localhost ([127.0.0.1]:44531 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1l83V8-0005iL-RO for submit <at> debbugs.gnu.org; Fri, 05 Feb 2021 10:58:31 -0500 Received: from eggs.gnu.org ([209.51.188.92]:42112) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1l83V7-0005i8-DV for 46326 <at> debbugs.gnu.org; Fri, 05 Feb 2021 10:58:29 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]:46937) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1l83V1-00012J-G5; Fri, 05 Feb 2021 10:58:23 -0500 Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:3098 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from <eliz@HIDDEN>) id 1l83V0-0005aB-Aq; Fri, 05 Feb 2021 10:58:23 -0500 Date: Fri, 05 Feb 2021 17:58:27 +0200 Message-Id: <83a6sipkv0.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: mail@HIDDEN In-Reply-To: <4aab2ef892b1df213ca67210021bcd47@HIDDEN> (mail@HIDDEN) Subject: Re: bug#46326: 27.1.50; Excessive memory allocations with minibuffer-with-setup-hook References: <62c490ed0d8d24d8b259ac1ba55ea79e@HIDDEN> <83eehuppx6.fsf@HIDDEN> <4aab2ef892b1df213ca67210021bcd47@HIDDEN> X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 46326 Cc: 46326 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.7 (-) > Date: Fri, 05 Feb 2021 16:20:13 +0100 > From: mail@HIDDEN > Cc: 46326 <at> debbugs.gnu.org > > > Please show information about the memory consumption. (The so-called > > "memory profile" doesn't actually measure memory consumption at all, > > it just uses memory allocation calls as a poor-man's profiling > > signal.) > > Yes, I am aware. I am not saying that live memory is the problem, > but the excessive amount of allocations is a problem, which creates > unnecessary garbage collector pauses. Therefore I can also not show > you a profile of the memory consumption, since it is not relevant. If you are saying that the Lisp code in question conses too many objects unnecessarily, then the solution is to modify the code to cons less objects. That doesn't necessarily indicates the existence of a bug in Emacs, certainly not with its memory management. > > What exactly caused you to run the profiler? is the code slow or > > something? If so, the problem may be something other than memory > > consumption. > > Yes, it is slow. Add-hook performs unnecessary allocations causing > pauses. After replacing the minibuffer-with-setup-hook default > implementation with my workaround the memory allocations went away > and the command is much faster. The add-hook calls do not appear in > the memory profile anymore. See the comment > https://github.com/minad/consult/issues/193#issuecomment-770650405. So if you already have a solution for the problem, what is it that you want us as Emacs maintainers to investigate and fix here?
bug-gnu-emacs@HIDDEN:bug#46326; Package emacs.
Full text available.Received: (at 46326) by debbugs.gnu.org; 5 Feb 2021 14:09:13 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Feb 05 09:09:13 2021 Received: from localhost ([127.0.0.1]:43228 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1l81nN-0000cL-H5 for submit <at> debbugs.gnu.org; Fri, 05 Feb 2021 09:09:13 -0500 Received: from eggs.gnu.org ([209.51.188.92]:45184) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1l81nM-0000c9-3p for 46326 <at> debbugs.gnu.org; Fri, 05 Feb 2021 09:09:12 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]:45276) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1l81nG-0003a2-8i; Fri, 05 Feb 2021 09:09:06 -0500 Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:4333 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from <eliz@HIDDEN>) id 1l81nF-0000jl-Hc; Fri, 05 Feb 2021 09:09:06 -0500 Date: Fri, 05 Feb 2021 16:09:09 +0200 Message-Id: <83eehuppx6.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: mail@HIDDEN In-Reply-To: <62c490ed0d8d24d8b259ac1ba55ea79e@HIDDEN> (mail@HIDDEN) Subject: Re: bug#46326: 27.1.50; Excessive memory allocations with minibuffer-with-setup-hook References: <62c490ed0d8d24d8b259ac1ba55ea79e@HIDDEN> X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 46326 Cc: 46326 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.7 (-) > Date: Fri, 05 Feb 2021 13:51:41 +0100 > From: mail@HIDDEN > > I have an issue on 27.1.50 with excessive memory allocations when using > minibuffer-with-setup-hook with large closures and :append. This issue > has been > observed in my Consult package, which is similar to Counsel and which > provides > commands based on completing-read. Naturally I have to perform some > setup in the > minibuffer-setup-hook. Most of the memory allocations are due to > add-hook and in > particular the sort function. The sort functions is called because of > :append > which sets a hook priority. The reason seems to be that large closures > are > copied, but I didn't fully investigate the reasons for the issue. > > Example profile: > > 140,068,687 92% - consult-buffer > 140,068,687 92% - consult--buffer Please show information about the memory consumption. (The so-called "memory profile" doesn't actually measure memory consumption at all, it just uses memory allocation calls as a poor-man's profiling signal.) Please show a recipe starting from "emacs -Q" where a lot of memory is being consumed, and please show how much memory does the recipe consume. Also, I presume invoking "M-x garbage-collect RET" doesn't release that memory? If so, please show the return value of garbage-collect. > See the issue https://github.com/minad/consult/issues/193 for reference. I don't see any memory information in that discussion. I guess you thought the memory profiler somehow shows memory consumption, but it doesn't. What exactly caused you to run the profiler? is the code slow or something? If so, the problem may be something other than memory consumption.
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Subject: 27.1.50; Excessive memory allocations with minibuffer-with-setup-hook
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Dear Emacs developers,
I have an issue on 27.1.50 with excessive memory allocations when using
minibuffer-with-setup-hook with large closures and :append. This issue
has been
observed in my Consult package, which is similar to Counsel and which
provides
commands based on completing-read. Naturally I have to perform some
setup in the
minibuffer-setup-hook. Most of the memory allocations are due to
add-hook and in
particular the sort function. The sort functions is called because of
:append
which sets a hook priority. The reason seems to be that large closures
are
copied, but I didn't fully investigate the reasons for the issue.
Example profile:
140,068,687 92% - consult-buffer
140,068,687 92% - consult--buffer
140,068,687 92% - consult--multi
138,933,527 91% - consult--read
138,933,527 91% - apply
138,933,527 91% - #<subr consult--read>
99,916,347 65% - consult--with-async-1
99,916,347 65% - #<compiled 0x3e02774d5b1a3f7>
99,912,203 65% - consult--with-preview-1
80,735,735 53% - #<compiled -0xbfb98ad3a8adf1c>
80,735,735 53% - completing-read
80,735,735 53% - selectrum-completing-read
62,909,765 41% - selectrum-read
>>> 58,826,659 38% + add-hook
1,077,206 0% +
selectrum--minibuffer-post-command-hook
....
>>> 19,176,468 12% + add-hook
>>> 39,017,180 25% + add-hook
The issue can be mitigated by using a modified version of
minibuffer-with-setup-hook, where I am creating a symbol and fsetting
instead of
adding a lambda directly via add-hook. This technique is also used in
set-transient-map in order to avoid problems with letrec-closures and
add-hook/remove-hook.
(defmacro consult--minibuffer-with-setup-hook (fun &rest body)
(declare (indent 1) (debug t))
(let ((hook (make-symbol "hook"))
(append))
(when (eq (car-safe fun) :append)
(setq append '(t) fun (cadr fun)))
`(let ((,hook (make-symbol "consult--minibuffer-setup")))
(fset ,hook (lambda ()
(remove-hook 'minibuffer-setup-hook ,hook)
(funcall ,fun)))
(unwind-protect
(progn
(add-hook 'minibuffer-setup-hook ,hook ,@append)
,@body)
(remove-hook 'minibuffer-setup-hook ,hook)))))
See the issue https://github.com/minad/consult/issues/193 for reference.
Maybe there exists an alternative solution to the problem and the
problem should
be fixed on a different level than by replacing the
minibuffer-with-setup-hook
macro?
Daniel Mendler
In GNU Emacs 27.1.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.5,
cairo version 1.16.0) of 2020-10-24
Repository revision: c847d5998f588dbf3eca5ea1ec573a2d64a97607
Repository branch: emacs-27
Windowing system distributor 'The X.Org Foundation', version
11.0.12004000
System Description: Debian GNU/Linux 10 (buster)
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