bug#61489: [PATCH 1/1] Increase BLOCK_ALIGN from 2¹⁰to 2¹⁵

[Ihor Radchenko <yantar92@posteo.net>]

Konstantin Kharlamov <Hi-Angel@yandex.ru> writes:

> While testing this change on Archlinux system with Intel i5-7200U CPU,
> average time of garbage collection gets reduced by ≈25%. While
> monitoring PSS of emacs with and without customizations loaded before
> and after the patch, no statistically significant differences were
> discovered. So overall, this change is a win.

In GNU Emacs 30.0.50 (build 9, x86_64-pc-linux-gnu, GTK+ Version
 3.24.35, cairo version 1.17.6) of 2023-02-14 built on localhost
Repository revision: 51320630cfbc452326e1d0d7b8a313f682129ec1
Repository branch: kk/bug-61489-increase-block
Windowing system distributor 'The X.Org Foundation', version 11.0.12101006
System Description: Gentoo Linux

Linux localhost 6.1.9-gentoo-x86_64 #1 SMP PREEMPT_DYNAMIC Mon Feb 13
14:05:49 +03 2023 x86_64 Intel(R) Core(TM) i7-10510U CPU @ 1.80GHz
GenuineIntel GNU/Linux

Running the benchmark from the blog post:
- without the patch: 0.600450
- with the patch:    0.321723 (~50% improvement)

I also changed gc-cons-threshold to 250,000,000 and gc-cons-percentage
to 0.0001. The results are nearly the same.

Running
(1) gc-cons-threshold <- most-positive-fixnum;
(2) org-element-parse-buffer on huge Org file (22Mb)
(3) garbage-collect:
- with the patch:    1.2494823932647705
- without the patch: 1.1721010208129883 (~6% improvement)

Memory consumption nearly unchanged.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
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