From: Pip Cet <pipcet@protonmail.com>
To: "Gerd Möllmann" <gerd.moellmann@gmail.com>
Cc: Helmut Eller <eller.helmut@gmail.com>,
Ihor Radchenko <yantar92@posteo.net>,
Eli Zaretskii <eliz@gnu.org>,
emacs-devel@gnu.org
Subject: Re: MPS: weak hash tables
Date: Sun, 07 Jul 2024 08:47:57 +0000 [thread overview]
Message-ID: <Wv1WuvCOxOw694ALaMiI6S3QBzl1F61IVjNCq1UuGI9Faeaf-Bm34HCprpBkgoUUBx-_62KA9Sm4KK0BBc3M0hKBCSKqJA-6zuzOMei5rv8=@protonmail.com> (raw)
In-Reply-To: <m2tth1vcd1.fsf@pro2.fritz.box>
On Sunday, July 7th, 2024 at 08:24, Gerd Möllmann <gerd.moellmann@gmail.com> wrote:
> Gerd Möllmann gerd.moellmann@gmail.com writes:
> > Helmut Eller eller.helmut@gmail.com writes:
> > > On Sun, Jul 07 2024, Pip Cet wrote:
> > > > What's going on here?
> > >
> > > How likely is a bug in the tree balancing code? I find it rather odd
> > > that the old GC rebalances interval trees during the sweep phase.
> >
> > I'd say not very likely but of course not impossible.
> >
> > The problem with the interval tree is that it isn't self-balancing like
> > say a red-black tree. It isn't using an algorithm that I recognize.
> > Already when I wrote the new redisplay code it was a problem that the
> > tree sometimes degraded for which I added more calls to balance it.
> >
> > Both string and buffer intervals are balanced in the swepp phase of the
> > old GC I see.
> >
> > Hm, maybe we are missing out on something here, in igc. I don't remember
> > that I balance in igc.
Do we remove intervals at all with igc? It looks to me like they're partially-weak objects, effectively, and we scan them strongly, removing them only when the buffer dies?
> I've also run the slow version of the test, when it happens to be slow
> which is a mystery, under Instruments, which is kind of the shitty
> equivalent of perf on macOS.
>
> From the little I see there, something I don't know is concatenating
> strings, and adding text properties to them. This allocates conses and
> intervals. The allocation point is running out of reserved memory,
> mps_ap_fill is called, and MPS scans like mad. That's where the time
> goes. Alone 13% of the whole time is spent in fix_cons for example.
>
> More I can't see with the tools I have available here. Maybe intersting
> could be that balance_intervals doesn't show up here, but that could be
> due to the differences in barrier implementation on macOS.
>
> And the good question is of course why is the test fast when invoked
> like Pip showed?
Well, the backtrace that's scanned lists all tests that have previously run (and their results), and thus it's a lot larger when there are more preceding tests.
And if I modify things a little and make the preceding test fail, the problem test doesn't seem to finish at all, and uses many gigabytes of memory...
Very strange.
Pip
next prev parent reply other threads:[~2024-07-07 8:47 UTC|newest]
Thread overview: 196+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-01 20:47 MPS: weak hash tables Gerd Möllmann
2024-07-01 21:16 ` Pip Cet
2024-07-01 23:10 ` Pip Cet
2024-07-02 4:19 ` Gerd Möllmann
2024-07-02 5:47 ` Gerd Möllmann
2024-07-02 6:23 ` Pip Cet
2024-07-02 6:55 ` Gerd Möllmann
2024-07-02 9:15 ` Pip Cet
2024-07-02 9:37 ` Gerd Möllmann
2024-07-02 10:11 ` Gerd Möllmann
2024-07-02 11:36 ` Gerd Möllmann
2024-07-02 13:15 ` Eli Zaretskii
2024-07-02 13:16 ` Gerd Möllmann
2024-07-02 13:42 ` Eli Zaretskii
2024-07-02 15:03 ` Pip Cet
2024-07-02 15:17 ` Helmut Eller
2024-07-02 15:35 ` Eli Zaretskii
2024-07-02 16:34 ` Pip Cet
2024-07-02 18:20 ` Eli Zaretskii
2024-07-02 20:16 ` Pip Cet
2024-07-03 6:30 ` Gerd Möllmann
2024-07-03 11:23 ` Eli Zaretskii
2024-07-03 11:28 ` Gerd Möllmann
2024-07-02 13:02 ` Eli Zaretskii
2024-07-02 12:45 ` Eli Zaretskii
2024-07-02 11:23 ` Helmut Eller
2024-07-03 6:11 ` Gerd Möllmann
2024-07-03 6:33 ` Pip Cet
2024-07-03 7:04 ` Gerd Möllmann
2024-07-03 7:24 ` Helmut Eller
2024-07-03 7:25 ` Pip Cet
2024-07-03 7:38 ` Gerd Möllmann
2024-07-03 8:26 ` Gerd Möllmann
2024-07-03 9:31 ` Pip Cet
2024-07-03 10:22 ` Gerd Möllmann
2024-07-03 10:41 ` Pip Cet
2024-07-03 11:17 ` Gerd Möllmann
2024-07-03 20:20 ` Pip Cet
2024-07-04 7:17 ` Gerd Möllmann
2024-07-04 15:24 ` Pip Cet
2024-07-04 16:53 ` Gerd Möllmann
2024-07-04 20:05 ` Pip Cet
2024-07-05 3:50 ` Gerd Möllmann
2024-07-05 12:08 ` Pip Cet
2024-07-05 12:54 ` Gerd Möllmann
2024-07-05 13:27 ` Eli Zaretskii
2024-07-05 20:35 ` Pip Cet
2024-07-06 6:10 ` Eli Zaretskii
2024-07-06 6:31 ` Pip Cet
2024-07-06 7:00 ` Eli Zaretskii
2024-07-06 7:40 ` Gerd Möllmann
2024-07-06 9:13 ` Pip Cet
2024-07-06 10:59 ` Eli Zaretskii
2024-07-05 18:14 ` Helmut Eller
2024-07-05 19:25 ` Pip Cet
2024-07-06 3:39 ` Gerd Möllmann
2024-07-06 5:58 ` Pip Cet
2024-07-06 6:20 ` Gerd Möllmann
2024-07-06 6:29 ` Pip Cet
2024-07-06 6:51 ` Gerd Möllmann
2024-07-06 6:46 ` Eli Zaretskii
2024-07-06 9:23 ` Pip Cet
2024-07-06 11:03 ` Eli Zaretskii
2024-07-06 3:38 ` Gerd Möllmann
2024-07-06 9:47 ` Helmut Eller
2024-07-06 10:38 ` Gerd Möllmann
2024-07-06 11:13 ` Eli Zaretskii
2024-07-06 13:50 ` Helmut Eller
2024-07-06 13:59 ` Eli Zaretskii
2024-07-06 14:38 ` Gerd Möllmann
2024-07-06 16:20 ` Helmut Eller
2024-07-06 16:33 ` Eli Zaretskii
2024-07-06 16:48 ` Helmut Eller
2024-07-06 17:21 ` Eli Zaretskii
2024-07-06 17:59 ` Helmut Eller
2024-07-06 18:14 ` Gerd Möllmann
2024-07-06 18:56 ` Eli Zaretskii
2024-07-06 11:37 ` Pip Cet
2024-07-06 11:40 ` Gerd Möllmann
2024-07-06 11:57 ` Gerd Möllmann
2024-07-06 12:03 ` Eli Zaretskii
2024-07-06 12:16 ` Gerd Möllmann
2024-07-06 12:23 ` Pip Cet
2024-07-06 12:39 ` Gerd Möllmann
2024-07-06 12:30 ` Eli Zaretskii
2024-07-06 12:43 ` Gerd Möllmann
2024-07-06 13:53 ` Eli Zaretskii
2024-07-06 12:36 ` Gerd Möllmann
2024-07-06 14:00 ` Helmut Eller
2024-07-06 14:08 ` Gerd Möllmann
2024-07-06 14:24 ` Gerd Möllmann
2024-07-06 14:44 ` Helmut Eller
2024-07-06 14:52 ` Gerd Möllmann
2024-07-06 15:49 ` Pip Cet
2024-07-06 16:31 ` Gerd Möllmann
2024-07-06 16:56 ` Pip Cet
2024-07-06 17:28 ` Gerd Möllmann
2024-07-06 17:31 ` Gerd Möllmann
2024-07-06 18:30 ` Pip Cet
2024-07-06 20:00 ` Gerd Möllmann
2024-07-06 20:09 ` Ihor Radchenko
2024-07-07 3:55 ` Gerd Möllmann
2024-07-07 4:27 ` Gerd Möllmann
2024-07-07 4:30 ` Gerd Möllmann
2024-07-07 6:38 ` Pip Cet
2024-07-07 7:31 ` Gerd Möllmann
2024-07-07 7:44 ` Helmut Eller
2024-07-07 8:10 ` Gerd Möllmann
2024-07-07 8:24 ` Gerd Möllmann
2024-07-07 8:47 ` Pip Cet [this message]
2024-07-07 9:24 ` Gerd Möllmann
2024-07-07 9:26 ` Gerd Möllmann
2024-07-07 10:47 ` Eli Zaretskii
2024-07-07 11:19 ` Gerd Möllmann
2024-07-07 14:09 ` Eli Zaretskii
2024-07-07 14:15 ` Gerd Möllmann
2024-07-07 14:42 ` Eli Zaretskii
2024-07-07 14:52 ` Gerd Möllmann
2024-07-07 15:34 ` Eli Zaretskii
2024-07-07 15:36 ` Gerd Möllmann
2024-07-07 16:00 ` Eli Zaretskii
2024-07-07 17:08 ` Gerd Möllmann
2024-07-07 17:49 ` Eli Zaretskii
2024-07-07 18:15 ` Gerd Möllmann
2024-07-07 18:22 ` Eli Zaretskii
2024-07-07 18:29 ` Gerd Möllmann
2024-07-07 14:16 ` Gerd Möllmann
2024-07-07 14:18 ` Gerd Möllmann
2024-07-07 10:57 ` Pip Cet
2024-07-07 11:35 ` Gerd Möllmann
2024-07-07 11:48 ` Gerd Möllmann
2024-07-07 14:07 ` Gerd Möllmann
2024-07-07 14:21 ` Pip Cet
2024-07-07 14:27 ` Gerd Möllmann
2024-07-07 15:22 ` Helmut Eller
2024-07-07 15:40 ` Gerd Möllmann
2024-07-07 15:52 ` Helmut Eller
2024-07-07 15:56 ` Gerd Möllmann
2024-07-07 15:57 ` Pip Cet
2024-07-07 16:26 ` Helmut Eller
2024-07-07 17:03 ` Gerd Möllmann
2024-07-07 18:40 ` Gerd Möllmann
2024-07-07 18:53 ` Helmut Eller
2024-07-07 19:00 ` Gerd Möllmann
2024-07-07 19:31 ` Pip Cet
2024-07-07 19:36 ` Gerd Möllmann
2024-07-08 9:11 ` MPS: commit limit Gerd Möllmann
2024-07-10 6:46 ` Helmut Eller
2024-07-10 7:08 ` Gerd Möllmann
2024-07-16 15:16 ` Helmut Eller
2024-07-16 15:27 ` Eli Zaretskii
2024-07-16 15:43 ` Helmut Eller
2024-07-16 15:54 ` Eli Zaretskii
2024-07-16 16:29 ` Helmut Eller
2024-07-16 16:39 ` Gerd Möllmann
2024-07-16 16:43 ` Pip Cet
2024-07-16 16:56 ` Gerd Möllmann
2024-07-16 15:32 ` Eli Zaretskii
2024-07-16 16:27 ` Helmut Eller
2024-07-16 18:49 ` Pip Cet
2024-07-17 6:15 ` Helmut Eller
2024-07-16 16:32 ` Pip Cet
2024-07-16 16:48 ` Helmut Eller
2024-07-08 5:11 ` MPS: weak hash tables Pip Cet
2024-07-08 5:17 ` Gerd Möllmann
2024-07-08 5:37 ` Pip Cet
2024-07-08 5:43 ` Gerd Möllmann
2024-07-07 8:49 ` Gerd Möllmann
2024-07-08 9:16 ` Andrea Corallo
2024-07-08 9:24 ` Gerd Möllmann
2024-07-08 9:54 ` Andrea Corallo
2024-07-08 10:10 ` Gerd Möllmann
2024-07-08 11:57 ` MPS: out-of-memory Eli Zaretskii
2024-07-08 13:46 ` Gerd Möllmann
2024-07-08 16:45 ` Pip Cet
2024-07-08 18:26 ` Gerd Möllmann
2024-07-08 19:44 ` Pip Cet
2024-07-09 3:58 ` Gerd Möllmann
2024-07-08 18:27 ` Helmut Eller
2024-07-08 18:31 ` Gerd Möllmann
2024-07-08 19:14 ` Eli Zaretskii
2024-07-08 19:35 ` Gerd Möllmann
2024-07-08 19:08 ` Eli Zaretskii
2024-07-08 19:31 ` Pip Cet
2024-07-04 15:22 ` MPS: weak hash tables Helmut Eller
2024-07-04 15:33 ` Pip Cet
2024-07-04 16:46 ` Gerd Möllmann
2024-07-04 16:43 ` Gerd Möllmann
2024-07-02 13:50 ` Mattias Engdegård
2024-07-02 6:57 ` Gerd Möllmann
2024-07-02 7:15 ` Gerd Möllmann
2024-07-02 8:46 ` Ihor Radchenko
2024-07-02 8:59 ` Gerd Möllmann
2024-07-02 9:33 ` Ihor Radchenko
2024-07-02 9:35 ` Pip Cet
2024-07-02 11:03 ` Ihor Radchenko
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