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bug#24603: [RFC 16/18] Refactor character class checking; optimise ASCII


From: Michal Nazarewicz
Subject: bug#24603: [RFC 16/18] Refactor character class checking; optimise ASCII case
Date: Thu, 22 Dec 2016 15:02:19 +0100
User-agent: Notmuch/0.19+53~g2e63a09 (http://notmuchmail.org) Emacs/26.0.50.2 (x86_64-unknown-linux-gnu)

On Tue, Dec 20 2016, Eli Zaretskii wrote:
>> From: Michal Nazarewicz <address@hidden>
>> Cc: address@hidden
>> Date: Tue, 20 Dec 2016 15:32:27 +0100
>> 
>> As can be seen, [[:graph:]] slows-down by almost 28% :( and I don’t
>> quite understand where all that can come from.
>
> If no ideas come up, perhaps run this under perf?

Yes, that’s what I’m trying to do.

It gets a bit convoluted since the benchmark attempts to test C code
with Elisp code which adds various superfluous entries in the profile
(e.g. Finotify_valid_p takes third of the time but I doubt it has
anything to do with character class matching).

On top of that, the generated gmon.out doesn’t include call traces which
makes it harder to track what is actually going on.

But hopefully I’ll figure something out.

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»





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