GNU bug report logs - #20154
25.0.50; json-encode-string is too slow for large strings

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Message #35 received at 20154 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 20154 <at> debbugs.gnu.org
Subject: Re: bug#20154: 25.0.50; json-encode-string is too slow for
 large strings
Date: Fri, 20 Mar 2015 20:42:14 +0200

On 03/20/2015 07:44 PM, Eli Zaretskii wrote:

> That's not what I see here.  I cannot get the time above 1 sec even
> with a 1000 time longer input string, if I replace json-encode-char
> with 1+.

What code exactly have you tried? You can't just replace 
json-encode-char with 1+. The former returns a string, the latter 
returns a number (or a char, I guess).

> So I think your 100ms is the constant overhead of some kind.

If you just changed the upper bound in the defvar init form (from 30000 
to something), I suspect you forgot to use C-M-x instead of C-x C-e, to 
update the actual value of the variable.

Making the string 10 times longer increases the runtime by ~5 here (0.1 
-> 0.5). Another 10x increase in length makes it run 4.3 seconds.

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