bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Aaron Jensen]

This is related to or maybe is bug#18522, which supposedly was fixed,
but it is unclear from the thread if just the usage of case-fold-search was
fixed or if the slow binding was meant to have been fixed.

I ran into this while tracking down why my org-agenda gets slower and
slower the longer I have emacs open.

(benchmark 1 '(let ((case-fold-search t)) t))

is roughly 1ms on a longer running emacs and .02ms on a fresh emacs.

My (length (buffer-list)) is 91 on the longer running emacs and 23 on
the fresh.

I don't know how to tell the length of my all_buffers or to see how many
killed buffers I have.

Any advice on how to further troubleshoot?

Thanks!


In GNU Emacs 27.0.50 (build 1, x86_64-apple-darwin17.6.0, NS appkit-1561.40 Version 10.13.5 (Build 17F77))
 of 2018-06-07 built on aaron-mbt.local
Repository revision: e2a98002020369cf0c09c7acf8557290e867705f
Windowing system distributor 'Apple', version 10.3.1561
System Description:  Mac OS X 10.13.5

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bug#31853: (27.0.50; binding case-fold-search is slow when there are many buffers)

[Aaron Jensen]

This is apparently the second time I've spent time tracking down perf
issues that have led to this same issue:

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=23928

Is it possible to improve this somehow? In this instance it's actually
org-mode that's binding case-fold-search in a tight loop in
org-scan-tags.

Thanks,

Aaron

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Noam Postavsky]

Aaron Jensen <aaronjensen@gmail.com> writes:

> I don't know how to tell the length of my all_buffers or to see how many
> killed buffers I have.

Try applying Martin's patch from #18522:

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18522#198

Then you can do M-: (killed-buffer-names) RET.

Although my understanding of the resolution of Bug#18522 is that dead
buffers should no longer affect the time for let-binding variables, just
live ones (but maybe the fix missed something).

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Fri, 15 Jun 2018 18:42:09 -0700
> 
> This is related to or maybe is bug#18522, which supposedly was fixed,

It is related to that bug only if you have a lot of dead buffers.  The
URL pointed out by Noam includes a patch that would allow you to count
dead buffers you have; can you do that?

> but it is unclear from the thread if just the usage of case-fold-search was
> fixed or if the slow binding was meant to have been fixed.

None of the above, AFAIU.  Gnus was fixed to not hit this problem.

> (benchmark 1 '(let ((case-fold-search t)) t))
> 
> is roughly 1ms on a longer running emacs and .02ms on a fresh emacs.
> 
> My (length (buffer-list)) is 91 on the longer running emacs and 23 on
> the fresh.

In a session that has 291 buffers, I get 2.8 microseconds, whereas in
fresh "emacs -Q", I get 1.5 microseconds.  This is 3 orders of
magnitude faster than what you get, and the difference between a large
session and a new one is much smaller.

IOW, there's some factor here that is not just the number of buffers
you have, I think.

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Eli Zaretskii]

[Please don't change the Subject in significant ways.]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Fri, 15 Jun 2018 19:10:08 -0700
> 
> This is apparently the second time I've spent time tracking down perf
> issues that have led to this same issue:
> 
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=23928
> 
> Is it possible to improve this somehow?

We don't yet understand what is there to improve.  Please follow up on
the suggestions elsewhere in this thread to collect more data about
the reason(s) for the slow let-binding in your case.

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@gmail.com>
> Date: Fri, 15 Jun 2018 22:17:44 -0400
> Cc: 31853@debbugs.gnu.org
> 
> Although my understanding of the resolution of Bug#18522 is that dead
> buffers should no longer affect the time for let-binding variables, just
> live ones (but maybe the fix missed something).

Which fix is that?  I think I'm missing it, because I don't think that
bug resolved the general problem.  Maybe I'm forgetting something.

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Aaron Jensen]

On Fri, Jun 15, 2018 at 11:45 PM Eli Zaretskii <eliz@gnu.org> wrote:
> It is related to that bug only if you have a lot of dead buffers.  The
> URL pointed out by Noam includes a patch that would allow you to count
> dead buffers you have; can you do that?

I've got it compiled in now and will report back when it repros as
badly as it did originally.

> In a session that has 291 buffers, I get 2.8 microseconds, whereas in
> fresh "emacs -Q", I get 1.5 microseconds.  This is 3 orders of
> magnitude faster than what you get, and the difference between a large
> session and a new one is much smaller.

I think I missed a zero on my original fresh emacs report. The report
of 1ms per for a long running emacs was correct though.
These should be accurate:
On emacs -Q I get 2 microseconds.
On a newly launched emacs w/ my config I get 3 microseconds with 9
buffers and 1 killed buffer.
On an emacs I've been running for a bit I get 40 microseconds with 71
buffers and 237 killed buffers.

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Sat, 16 Jun 2018 00:39:00 -0700
> Cc: 31853@debbugs.gnu.org
> 
> > In a session that has 291 buffers, I get 2.8 microseconds, whereas in
> > fresh "emacs -Q", I get 1.5 microseconds.  This is 3 orders of
> > magnitude faster than what you get, and the difference between a large
> > session and a new one is much smaller.
> 
> I think I missed a zero on my original fresh emacs report. The report
> of 1ms per for a long running emacs was correct though.
> These should be accurate:
> On emacs -Q I get 2 microseconds.
> On a newly launched emacs w/ my config I get 3 microseconds with 9
> buffers and 1 killed buffer.
> On an emacs I've been running for a bit I get 40 microseconds with 71
> buffers and 237 killed buffers.

In https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18522#201 I proposed
a change to set-default that would use FOR_EACH_LIVE_BUFFER.  Could
you see if that change helps in your case?

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Noam Postavsky]

Eli Zaretskii <eliz@gnu.org> writes:

>> Although my understanding of the resolution of Bug#18522 is that dead
>> buffers should no longer affect the time for let-binding variables, just
>> live ones (but maybe the fix missed something).
>
> Which fix is that?  I think I'm missing it, because I don't think that
> bug resolved the general problem.  Maybe I'm forgetting something.

Oh, nevermind, I had gathered from reading the bug#18522 thread that
set-internal's FOR_EACH_BUFFER was replaced with FOR_EACH_LIVE_BUFFER,
but actually looking at the code I see it isn't so.

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Aaron Jensen]

[-- Attachment #1: Type: text/plain, Size: 459 bytes --]

On Sat, Jun 16, 2018 at 12:53 AM Eli Zaretskii <eliz@gnu.org> wrote:
> In https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18522#201 I proposed
> a change to set-default that would use FOR_EACH_LIVE_BUFFER.  Could
> you see if that change helps in your case?

So far so good. I'll try it out for a few more days and see if it
stays fast. The patch I'm trying is attached if anyone else wants to
give it a go or check to ensure I didn't do something wrong in it.

[-- Attachment #2: 0001-Test.patch --]
[-- Type: application/octet-stream, Size: 905 bytes --]

From 6b1884635a4bac85fe2a9a04d685cc80dc84a909 Mon Sep 17 00:00:00 2001
From: Aaron Jensen <aaronjensen@gmail.com>
Date: Sat, 16 Jun 2018 01:13:21 -0700
Subject: [PATCH] Test

---
 src/data.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/data.c b/src/data.c
index 49c3dd834b..1133dc02da 100644
--- a/src/data.c
+++ b/src/data.c
@@ -1710,11 +1710,12 @@ set_default_internal (Lisp_Object symbol, Lisp_Object value,
 	       set it in the buffers that don't nominally have a local value.  */
 	    if (idx > 0)
 	      {
+                Lisp_Object tail, buf;
 		struct buffer *b;
 
-		FOR_EACH_BUFFER (b)
-		  if (!PER_BUFFER_VALUE_P (b, idx))
-		    set_per_buffer_value (b, offset, value);
+		FOR_EACH_LIVE_BUFFER (tail, buf)
+		  if (!PER_BUFFER_VALUE_P (XBUFFER (buf), idx))
+		    set_per_buffer_value (XBUFFER (buf), offset, value);
 	      }
 	  }
 	else
-- 
2.17.1

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Aaron Jensen]

> On Sat, Jun 16, 2018 at 12:53 AM Eli Zaretskii <eliz@gnu.org> wrote:
> > In https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18522#201 I proposed
> > a change to set-default that would use FOR_EACH_LIVE_BUFFER.  Could
> > you see if that change helps in your case?

With 148 live buffers and 6 hours of uptime, I'm up to about 23
microseconds. Still a far cry from 1ms. I'll keep testing.

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Sun, 17 Jun 2018 05:37:41 -0700
> Cc: 31853@debbugs.gnu.org
> 
> > On Sat, Jun 16, 2018 at 12:53 AM Eli Zaretskii <eliz@gnu.org> wrote:
> > > In https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18522#201 I proposed
> > > a change to set-default that would use FOR_EACH_LIVE_BUFFER.  Could
> > > you see if that change helps in your case?
> 
> With 148 live buffers and 6 hours of uptime, I'm up to about 23
> microseconds. Still a far cry from 1ms. I'll keep testing.

Thanks.

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Aaron Jensen]

On Sun, Jun 17, 2018 at 6:11 AM Eli Zaretskii <eliz@gnu.org> wrote:
>
> > From: Aaron Jensen <aaronjensen@gmail.com>
> > Date: Sun, 17 Jun 2018 05:37:41 -0700
> > Cc: 31853@debbugs.gnu.org
> >
> > > On Sat, Jun 16, 2018 at 12:53 AM Eli Zaretskii <eliz@gnu.org> wrote:
> > > > In https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18522#201 I proposed
> > > > a change to set-default that would use FOR_EACH_LIVE_BUFFER.  Could
> > > > you see if that change helps in your case?
> >
> > With 148 live buffers and 6 hours of uptime, I'm up to about 23
> > microseconds. Still a far cry from 1ms. I'll keep testing.
>
> Thanks.

I haven't noticed any slowdown yet. It seems to be an improvement. If
you're good with the patch and could provide me with some text to
write in the commit message (I roughly understand what it does, but I
don't know anything about the other ramifications) I can send another
patch. Otherwise, please feel free to use the patch and commit w/ your
own message/name.

Thanks.

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Fri, 22 Jun 2018 22:23:09 -0700
> Cc: 31853@debbugs.gnu.org
> 
> > > > On Sat, Jun 16, 2018 at 12:53 AM Eli Zaretskii <eliz@gnu.org> wrote:
> > > > > In https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18522#201 I proposed
> > > > > a change to set-default that would use FOR_EACH_LIVE_BUFFER.  Could
> > > > > you see if that change helps in your case?
> > >
> > > With 148 live buffers and 6 hours of uptime, I'm up to about 23
> > > microseconds. Still a far cry from 1ms. I'll keep testing.
> >
> > Thanks.
> 
> I haven't noticed any slowdown yet. It seems to be an improvement. If
> you're good with the patch and could provide me with some text to
> write in the commit message (I roughly understand what it does, but I
> don't know anything about the other ramifications) I can send another
> patch. Otherwise, please feel free to use the patch and commit w/ your
> own message/name.

There's no rush.  Let's give this another week, and I will push the
change if no problems come up by that date.

Thanks.

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Eli Zaretskii]

> Date: Sat, 23 Jun 2018 09:54:07 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 31853@debbugs.gnu.org
> 
> > From: Aaron Jensen <aaronjensen@gmail.com>
> > Date: Fri, 22 Jun 2018 22:23:09 -0700
> > Cc: 31853@debbugs.gnu.org
> > 
> > > > > On Sat, Jun 16, 2018 at 12:53 AM Eli Zaretskii <eliz@gnu.org> wrote:
> > > > > > In https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18522#201 I proposed
> > > > > > a change to set-default that would use FOR_EACH_LIVE_BUFFER.  Could
> > > > > > you see if that change helps in your case?
> > > >
> > > > With 148 live buffers and 6 hours of uptime, I'm up to about 23
> > > > microseconds. Still a far cry from 1ms. I'll keep testing.
> > >
> > > Thanks.
> > 
> > I haven't noticed any slowdown yet. It seems to be an improvement. If
> > you're good with the patch and could provide me with some text to
> > write in the commit message (I roughly understand what it does, but I
> > don't know anything about the other ramifications) I can send another
> > patch. Otherwise, please feel free to use the patch and commit w/ your
> > own message/name.
> 
> There's no rush.  Let's give this another week, and I will push the
> change if no problems come up by that date.

Pushed to master.

Is there anything else to do in this bug, or should it be closed now?

Thanks.

bug#31853: (27.0.50; binding case-fold-search is slow when there are many buffers)

[Stefan Monnier]

> Is it possible to improve this somehow? In this instance it's actually
> org-mode that's binding case-fold-search in a tight loop in
> org-scan-tags.

BTW, I think that the idea that let-binding a dynamically-scoped var is
cheap is wrong.
It's basically only cheap when lexical-binding works as well ;-)

So regardless of whether we can speed it up like Eli did just now (by
only looping over the live buffers), the org-scan-tags code that
let-binds it within a tight loop should be fixed.


        Stefan

bug#31853: (27.0.50; binding case-fold-search is slow when there are many buffers)

[Eli Zaretskii]

> From: Stefan Monnier <monnier@IRO.UMontreal.CA>
> Date: Sat, 30 Jun 2018 09:18:23 -0400
> Cc: 31853@debbugs.gnu.org
> 
> So regardless of whether we can speed it up like Eli did just now (by
> only looping over the live buffers), the org-scan-tags code that
> let-binds it within a tight loop should be fixed.

I agree.

bug#31853: 27.0.50; binding case-fold-search is slow when there are many buffers

[Aaron Jensen]

On Sat, Jun 30, 2018 at 1:19 AM Eli Zaretskii <eliz@gnu.org> wrote:
> Pushed to master.
>
> Is there anything else to do in this bug, or should it be closed now?

Thanks! I'm happy to close. I do agree with Stefan as well that it
should be fixed in org, but it was non-obvious to me as the loop
depends on two different values of case-fold-search :/