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Re: What to do for faster `remove-duplicates'?

From: Oleh Krehel
Subject: Re: What to do for faster `remove-duplicates'?
Date: Wed, 06 May 2015 16:13:11 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

Artur Malabarba <address@hidden> 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)

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

I don't know if it's worth optimizing further.


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