From: Oleh Krehel <ohwoeowho@gmail.com>
To: Artur Malabarba <bruce.connor.am@gmail.com>
Cc: Stefan Monnier <monnier@iro.umontreal.ca>,
emacs-devel <emacs-devel@gnu.org>
Subject: Re: What to do for faster `remove-duplicates'?
Date: Wed, 06 May 2015 16:13:11 +0200 [thread overview]
Message-ID: <87ioc5kd54.fsf@gmail.com> (raw)
In-Reply-To: <CAAdUY-KYbbVMrOJB_q_qdkiV=A6KmbxhSuQ-09Ef3WaY7HrTLg@mail.gmail.com> (Artur Malabarba's message of "Wed, 6 May 2015 15:04:19 +0100")
Artur Malabarba <bruce.connor.am@gmail.com> writes:
>> I attach the patch. I did a bunch of `benchmark-run' and it seems that
>> 100 elements is the breaking point.
>
> Small question. How much slower is this patch compared to the current
> version on a list of 99 elements? (Due to having to calculate the
> length)
For 99 unique candidates, the call to `length' takes 5% time compared to
the call to `delete-dups':
(/ 3.774e-06 6.3028e-05)
0.05987814939392017
It becomes worse for a small amount of unique candidates, going to 30%
for 10 candidates, but a lot of that is the standard cost of calling a
function.
I don't know if it's worth optimizing further.
Oleh
next prev parent reply other threads:[~2015-05-06 14:13 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-06 7:33 What to do for faster `remove-duplicates'? Oleh Krehel
2015-05-06 12:59 ` Stefan Monnier
2015-05-06 13:30 ` Oleh Krehel
2015-05-06 13:50 ` Stefan Monnier
2015-05-06 13:51 ` Oleh Krehel
2015-05-06 17:43 ` Thierry Volpiatto
2015-05-06 17:54 ` Oleh Krehel
2015-05-06 18:31 ` Artur Malabarba
2015-05-06 18:33 ` Artur Malabarba
2015-05-06 18:41 ` Oleh Krehel
2015-05-06 19:24 ` Artur Malabarba
2015-05-06 19:32 ` Oleh Krehel
2015-05-06 21:22 ` Artur Malabarba
2015-05-06 18:48 ` Thierry Volpiatto
2015-05-06 20:54 ` Stefan Monnier
2015-05-06 20:54 ` Stefan Monnier
2015-05-06 21:18 ` Artur Malabarba
2015-05-06 14:04 ` Artur Malabarba
2015-05-06 14:13 ` Oleh Krehel [this message]
2015-05-06 14:49 ` Artur Malabarba
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