Reported by: John Wiegley <jwiegley <at> gmail.com>
Date: Wed, 23 May 2012 07:27:02 UTC
Severity: normal
Done: Stefan Kangas <stefan <at> marxist.se>
Bug is archived. No further changes may be made.
View this message in rfc822 format
From: John Wiegley <jwiegley <at> gmail.com> To: Alan Mackenzie <acm <at> muc.de> Cc: Glenn Morris <rgm <at> gnu.org>, mituharu+bug-gnu-emacs-mac <at> math.s.chiba-u.ac.jp, 11545 <at> debbugs.gnu.org Subject: bug#11545: 24.0.96-mac-2.92; Strange speed problem scrolling in C++ code Date: Sat, 26 May 2012 02:46:15 -0500
>>>>> Alan Mackenzie <acm <at> muc.de> writes: > Could you possibly check this is the case in your file.c++ using elp. > Here's a quick recipe in case you haven't used it before: [ M-x > elp-instrument-package <ret> c- <ret>. Scroll with C-v, either once or an > arbitrary number of times. M-x elp-results.] Results attached below. > The cost of this correct fontification is the "slight" sluggishness being > seen here. It is likely possible to optimise this function somewhat, though > probably it's now too late for Emacs 24.1. I'd rather forgo the correctness for the speed, since cc-mode has never been 100% correct, but it's always been correct enough. John Function Name Call Count Elapsed Time Average Time c-font-lock-fontify-region 1529 31.313269999 0.0204795748 c-beginning-of-decl-1 3657 11.680622999 0.0031940451 c-font-lock-declarations 1529 11.070964000 0.0072406566 c-find-decl-spots 1529 11.035531000 0.0072174826 c-context-set-fl-decl-start 1529 10.549607 0.0068996775 c-set-fl-decl-start 1529 10.542452999 0.0068949986 c-beginning-of-statement-1 3910 9.8793279999 0.0025266823 c-backward-sws 123582 8.8908430000 7.194...e-05 c-crosses-statement-barrier-p 15967 7.1756169999 0.0004494029 c-parse-state 14667 6.1785950000 0.0004212582 c-parse-state-1 14667 5.6588790000 0.0003858238 c-font-lock-enclosing-decls 1529 4.462361 0.0029184833 c-determine-limit 5498 3.4111050000 0.0006204265 c-append-to-state-cache 14467 2.5331440000 0.0001750980 c-remove-stale-state-cache 14425 2.0322649999 0.0001408849 c-forward-decl-or-cast-1 6632 1.9189249999 0.0002893433 c-beginning-of-macro 164245 1.8161729999 1.105...e-05 c-forward-type 18312 1.5136799999 8.266...e-05 c-in-knr-argdecl 3367 1.5124650000 0.0004492025 c-syntactic-skip-backward 3882 1.3911049999 0.0003583475 c-font-lock-enum-tail 1529 1.1747370000 0.0007683041 c-font-lock-complex-decl-prepare 1529 0.786506 0.0005143924 c-backward-token-2 21271 0.7062790000 3.320...e-05 c-literal-limits 25371 0.7047289999 2.777...e-05 c-at-macro-vsemi-p 30271 0.7038709999 2.325...e-05 c-font-lock-declarators 3723 0.6608859999 0.0001775143 c-forward-name 18056 0.5404579999 2.993...e-05 c-parse-state-get-strategy 14667 0.4485610000 3.058...e-05 c-cheap-inside-bracelist-p 5015 0.4087189999 8.149...e-05 c-forward-sws 60915 0.3506809999 5.756...e-06 c-syntactic-re-search-forward 7741 0.2931619999 3.787...e-05 c-syntactic-content 10849 0.2439560000 2.248...e-05 c-forward-token-2 5974 0.2161999999 3.619...e-05 c-add-type 3181 0.1633079999 5.133...e-05 c-append-lower-brace-pair-to-state-cache 153 0.1180970000 0.0007718758 c-state-semi-safe-place 7045 0.1104430000 1.567...e-05 c-remove-stale-state-cache-backwards 242 0.0868989999 0.0003590867 c-beginning-of-current-token 8514 0.0621019999 7.294...e-06 c-looking-at-inexpr-block 342 0.0573979999 0.0001678304 c-state-get-min-scan-pos 14865 0.0395270000 2.659...e-06 c-get-fallback-scan-pos 106 0.039258 0.0003703584 c-forward-label 274 0.0353939999 0.0001291751 c-get-cache-scan-pos 14667 0.0347800000 2.371...e-06 c-beginning-of-syntax 250 0.0315929999 0.0001263719 c-font-lock-doc-comments 3058 0.0247469999 8.092...e-06 c-safe-position 4286 0.0241799999 5.641...e-06 c-state-literal-at 267 0.0240109999 8.992...e-05 c-on-identifier 694 0.0237040000 3.415...e-05 c-after-conditional 79 0.0234840000 0.0002972658 c-syntactic-end-of-macro 684 0.0193390000 2.827...e-05 c-forward-annotation 6632 0.0187899999 2.833...e-06 c-skip-comments-and-strings 7979 0.0155589999 1.949...e-06 c-punctuation-in 636 0.0123149999 1.936...e-05 c-forward-keyword-clause 831 0.0096369999 1.159...e-05 c-fontify-recorded-types-and-refs 6869 0.0094569999 1.376...e-06 c-state-safe-place 267 0.0069390000 2.598...e-05 c-end-of-macro 2442 0.0062260000 2.549...e-06 c-font-lock-invalid-string 1031 0.0052879999 5.129...e-06 c-end-of-current-token 1207 0.0048019999 3.978...e-06 c-state-balance-parens-backwards 202 0.00426 2.108...e-05 c-most-enclosing-brace 1789 0.0022139999 1.237...e-06 c-renarrow-state-cache 10 0.0010699999 0.0001069999 c-state-mark-point-min-literal 10 0.001004 0.0001003999 c-forward-single-comment 37 0.0004699999 1.270...e-05 c-at-toplevel-p 2 0.00028 0.00014 c-forward-to-cpp-define-body 8 8.099...e-05 1.012...e-05 c-search-uplist-for-classkey 2 1.2e-05 6e-06 c-leave-cc-mode-mode 3 4.999...e-06 1.666...e-06
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