From: Eli Zaretskii <eliz@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: How to count the number of occurrences of a character in a string?
Date: Tue, 13 Oct 2015 23:17:28 +0300 [thread overview]
Message-ID: <83si5ey147.fsf@gnu.org> (raw)
In-Reply-To: <CAFyQvY2N9gprSFx2hUr0bJBnsTDoyhXcXXgwe8-Rgk14NqO_7A@mail.gmail.com>
> From: Kaushal Modi <kaushal.modi@gmail.com>
> Date: Tue, 13 Oct 2015 15:56:57 -0400
> Cc: Help Gnu Emacs mailing list <help-gnu-emacs@gnu.org>
>
> Now I see some convergence in the results and this was the conclusion,
> fastest to slowest
>
> 1. cl-count
> 2. Eli's cdr approach
> 3. My string-match-p approach
>
> Code: https://gist.github.com/ab487f63727381179f61
> Raw results:
>
> 1000 executions of string-match-p approach took 0.047036 seconds
> 1000 executions of cl-count approach took 0.036476 seconds
> 1000 executions of cdr approach took 0.043735 seconds
> nil
> 1000 executions of string-match-p approach took 0.046918 seconds
> 1000 executions of cl-count approach took 0.035476 seconds
> 1000 executions of cdr approach took 0.202394 seconds
> nil
Looks like 1000 loops is too few: your measurements hit clock
quantization error, and also some background activities affect the
results. I suggest to try 10000 iterations.
Also, did you actually try 'mapc', per my second suggestion?
next prev parent reply other threads:[~2015-10-13 20:17 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 19:45 How to count the number of occurrences of a character in a string? Marcin Borkowski
2015-10-12 21:43 ` Kaushal Modi
2015-10-12 23:27 ` Nick Dokos
2015-10-13 1:18 ` Stefan Monnier
2015-10-13 16:06 ` Kaushal Modi
2015-10-13 16:31 ` Kaushal Modi
2015-10-13 16:48 ` Eli Zaretskii
2015-10-13 17:41 ` Eli Zaretskii
2015-10-13 17:43 ` Kaushal Modi
2015-10-13 19:07 ` Eli Zaretskii
2015-10-13 19:56 ` Kaushal Modi
2015-10-13 20:17 ` Eli Zaretskii [this message]
2015-10-13 20:41 ` Kaushal Modi
[not found] ` <mailman.267.1444767491.7904.help-gnu-emacs@gnu.org>
2015-10-13 20:46 ` Brendan Halpin
2015-10-13 21:07 ` Kaushal Modi
[not found] ` <mailman.273.1444770543.7904.help-gnu-emacs@gnu.org>
2015-10-13 22:44 ` Joost Kremers
2015-10-14 10:04 ` Oleh Krehel
2015-10-14 17:06 ` Eli Zaretskii
2015-10-13 20:43 ` Michael Heerdegen
2015-10-13 20:59 ` Charles Curley
2015-10-14 18:19 ` Noam Postavsky
2015-10-14 20:00 ` Kaushal Modi
2015-10-13 22:00 ` Emanuel Berg
[not found] <mailman.164.1444679125.7904.help-gnu-emacs@gnu.org>
2015-10-12 23:35 ` Joost Kremers
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