Reported by: Peter Münster <pmlists <at> free.fr>
Date: Mon, 22 Sep 2014 10:38:02 UTC
Severity: normal
Tags: fixed
Found in version 24.4.50
Done: Lars Ingebrigtsen <larsi <at> gnus.org>
Bug is archived. No further changes may be made.
Message #90 received at 18522 <at> debbugs.gnu.org (full text, mbox):
From: Peter Münster <pmlists <at> free.fr> To: Eli Zaretskii <eliz <at> gnu.org> Cc: larsi <at> gnus.org, 18522 <at> debbugs.gnu.org Subject: Re: bug#18522: 24.4.50; mapcar is very slow Date: Sun, 21 Feb 2016 12:00:07 +0100
On Sat, Feb 20 2016, Eli Zaretskii wrote:
> I'd start with profiler.el, to profile the Lisp portions of the
> function. It's probably best to load the .el file first and profile
> that, although this could skew the profile (because the byte-compiled
> version behaves differently).
Here are 2 profiler reports. The first one, where parse-time-string is
very slow:
--8<---------------cut here---------------start------------->8---
- command-execute 8396 93%
- call-interactively 8396 93%
- funcall-interactively 7881 88%
- eval-expression 7848 87%
- eval 7848 87%
- let 7848 87%
- while 7848 87%
- parse-time-string 7840 87%
- let 7836 87%
- parse-time-tokenize 7089 79%
- let 7073 79%
- while 7057 78%
- while 6959 77%
- and 6891 77%
- setq 4445 49%
- parse-time-string-chars 4413 49%
- let 4301 48%
- unwind-protect 4189 46%
- progn 4141 46%
- let 436 4%
- cond 408 4%
- string-match 96 1%
setq 68 0%
set-match-data 4 0%
- not 2338 26%
- setq 2310 25%
- parse-time-string-chars 2282 25%
- let 2258 25%
- unwind-protect 2170 24%
- progn 2126 23%
- let 176 1%
- cond 160 1%
- string-match 24 0%
setq 16 0%
--8<---------------cut here---------------end--------------->8---
And this one from "emacs -Q":
--8<---------------cut here---------------start------------->8---
- command-execute 2643 90%
- call-interactively 2643 90%
- funcall-interactively 2221 75%
- eval-expression 2013 68%
- eval 2013 68%
- let 2013 68%
- while 2013 68%
- parse-time-string 2002 68%
- let 2002 68%
- parse-time-tokenize 1291 44%
- let 1283 43%
- while 1272 43%
- while 1112 38%
- and 1044 35%
- setq 640 21%
- parse-time-string-chars 608 20%
- let 557 19%
- unwind-protect 461 15%
- progn 401 13%
- let 345 11%
- cond 285 9%
- string-match 56 1%
setq 40 1%
set-match-data 16 0%
- not 288 9%
- setq 268 9%
- parse-time-string-chars 244 8%
- let 208 7%
- unwind-protect 192 6%
- progn 152 5%
- let 120 4%
- cond 112 3%
- string-match 32 1%
setq 32 1%
set-match-data 4 0%
--8<---------------cut here---------------end--------------->8---
It seems to me, that there is a problem with "progn":
Slow emacs:
- progn 4141 46%
- let 436 4%
Fast emacs:
- progn 401 13%
- let 345 11%
What do you think?
--
Peter
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