|
| From: | Eli Zaretskii |
| Subject: | Re: emacs rendering comparisson between emacs23 and emacs26.3 |
| Date: | Sat, 28 Mar 2020 12:08:30 +0300 |
> Date: Sat, 28 Mar 2020 10:09:59 +0300
> From: Eli Zaretskii <address@hidden>
> Cc: address@hidden, address@hidden, address@hidden
>
> > It would be interesting to compare 24 and 23, to see what slowdown
> > there is.
>
> I expect an average twofold slowdown due to bidirectional support.
Actually, I take that back: in benchmarks such as scroll-up-benchmark,
and in a buffer with predominantly ASCII text, the effect of
bidirectional support should be very small, perhaps 10% or 20%.
So the issue of testing old v23.x CC Mode with newer versions of Emacs
becomes more important than I originally thought. Just as a teaser,
here's the profile I obtained by scrolling in Emacs 26.3 through the
entire xdisp.c, it seems to point to c-find-decl-spots and its
immediate callers and subroutines as the hot spots:
- command-execute 1446 100%
- call-interactively 1446 100%
- funcall-interactively 1446 100%
- execute-extended-command 1446 100%
- command-execute 1446 100%
- call-interactively 1446 100%
- funcall-interactively 1446 100%
- scroll-up-benchmark 1446 100%
- let 1446 100%
- condition-case 1446 100%
- while 1446 100%
- redisplay 1351 93%
- redisplay_internal (C function) 1071 74%
- jit-lock-function 1064 73%
- jit-lock-fontify-now 1063 73%
- jit-lock--run-functions 1063 73%
- run-hook-wrapped 1063 73%
- #<compiled 0x2000000008356520> 1063 73%
- font-lock-fontify-region 1061 73%
- c-font-lock-fontify-region 1061 73%
- font-lock-default-fontify-region 982 67%
- font-lock-fontify-keywords-region 969 67%
- c-font-lock-declarations 686 47%
- c-find-decl-spots 674 46%
- #<compiled 0x20000000077e07c0> 477 32%
- c-get-fontification-context 253 17%
- c-looking-at-or-maybe-in-bracelist 203 14%
- c-backward-token-2 196 13%
- c-backward-sws 35 2%
- c-beginning-of-macro 12 0%
back-to-indentation 6 0%
- c-backward-token-2 16 1%
- c-backward-sws 7 0%
c-beginning-of-current-token 1 0%
c-beginning-of-current-token 1 0%
- c-back-over-compound-identifier 15 1%
- c-backward-sws 6 0%
- c-beginning-of-macro 3 0%
back-to-indentation 3 0%
c-on-identifier 5 0%
c-backward-token-2 2 0%
- c-backward-sws 6 0%
c-beginning-of-macro 1 0%
- c-forward-decl-or-cast-1 125 8%
- c-forward-type 65 4%
- c-forward-name 18 1%
c-forward-sws 4 0%
- c-syntactic-content 4 0%
c-forward-sws 1 0%
apply 1 0%
c-add-type 3 0%
- c-forward-keyword-clause 2 0%
c-forward-sws 1 0%
- c-backward-token-2 9 0%
c-backward-sws 3 0%
c-beginning-of-current-token 2 0%
- c-directly-in-class-called-p 3 0%
- c-looking-at-decl-block 2 0%
- c-syntactic-skip-backward 2 0%
- c-parse-state 2 0%
- c-parse-state-1 1 0%
- c-parse-state-get-strategy 1 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
- c-parse-state 1 0%
c-parse-state-1 1 0%
- c-forward-name 3 0%
c-forward-sws 2 0%
c-forward-sws 3 0%
c-forward-annotation 1 0%
- c-forward-label 33 2%
- c-after-conditional 8 0%
- c-backward-token-2 6 0%
- c-backward-sws 5 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
c-beginning-of-current-token 1 0%
- c-syntactic-re-search-forward 7 0%
- c-beginning-of-macro 4 0%
back-to-indentation 1 0%
c-forward-sws 4 0%
c-beginning-of-current-token 1 0%
- c-backward-sws 12 0%
- c-beginning-of-macro 2 0%
back-to-indentation 1 0%
- c-font-lock-single-decl 10 0%
- c-font-lock-declarators 9 0%
- c-forward-declarator 8 0%
- c-backward-sws 3 0%
c-beginning-of-current-token 2 0%
- c-forward-name 2 0%
c-forward-sws 1 0%
c-syntactic-re-search-forward 1 0%
- c-backward-token-2 10 0%
c-backward-sws 4 0%
c-beginning-of-current-token 3 0%
- c-bs-at-toplevel-p 141 9%
- c-brace-stack-at 135 9%
- c-update-brace-stack 126 8%
- c-syntactic-re-search-forward 87 6%
- c-beginning-of-macro 22 1%
back-to-indentation 15 1%
c-beginning-of-current-token 17 1%
match-string-no-properties 1 0%
- c-beginning-of-macro 13 0%
back-to-indentation 9 0%
c-forward-sws 11 0%
c-backward-sws 1 0%
- c-font-lock-cut-off-declarators 116 8%
- c-back-over-member-initializers 35 2%
- c-parse-state 8 0%
- c-parse-state-1 8 0%
- c-remove-stale-state-cache 3 0%
- c-beginning-of-macro 3 0%
back-to-indentation 1 0%
- c-append-to-state-cache 2 0%
- c-beginning-of-macro 2 0%
back-to-indentation 2 0%
- c-parse-state-get-strategy 1 0%
c-beginning-of-macro 1 0%
- c-just-after-func-arglist-p 7 0%
c-beginning-of-statement-1 7 0%
- c-backward-sws 5 0%
- c-beginning-of-macro 2 0%
back-to-indentation 2 0%
- c-back-over-compound-identifier 2 0%
c-on-identifier 2 0%
- c-syntactic-skip-backward 30 2%
- c-parse-state 16 1%
- c-parse-state-1 16 1%
- c-append-lower-brace-pair-to-state-cache 5 0%
c-beginning-of-macro 1 0%
c-remove-stale-state-cache 2 0%
c-append-to-state-cache 2 0%
- c-remove-stale-state-cache-backwards 2 0%
c-state-balance-parens-backwards 1 0%
- c-state-literal-at 1 0%
c-state-pp-to-literal 1 0%
- c-parse-state-get-strategy 1 0%
- c-beginning-of-macro 1 0%
#<compiled 0x2000000001a3f060> 1 0%
c-beginning-of-macro 1 0%
- c-determine-limit 22 1%
c-state-semi-pp-to-literal 8 0%
- c-determine-limit 3 0%
c-state-semi-pp-to-literal 2 0%
- c-parse-state 6 0%
- c-parse-state-1 6 0%
c-append-lower-brace-pair-to-state-cache 6 0%
- c-forward-decl-or-cast-1 5 0%
c-forward-annotation 1 0%
- c-forward-type 1 0%
c-forward-name 1 0%
- c-get-fontification-context 3 0%
- c-looking-at-or-maybe-in-bracelist 3 0%
c-backward-token-2 3 0%
- c-at-toplevel-p 3 0%
- c-search-uplist-for-classkey 3 0%
- c-looking-at-decl-block 3 0%
- c-syntactic-skip-backward 3 0%
- c-parse-state 2 0%
- c-parse-state-1 1 0%
c-remove-stale-state-cache-backwards 1 0%
c-beginning-of-macro 1 0%
c-forward-sws 2 0%
- c-font-lock-single-decl 1 0%
c-font-lock-declarators 1 0%
- c-font-lock-enclosing-decls 54 3%
- c-determine-limit 25 1%
- c-state-semi-pp-to-literal 12 0%
#<compiled 0x2000000001a640b8> 1 0%
- c-determine-limit 4 0%
c-state-semi-pp-to-literal 3 0%
- c-syntactic-skip-backward 16 1%
- c-parse-state 10 0%
- c-parse-state-1 9 0%
- c-parse-state-get-strategy 3 0%
- c-beginning-of-macro 2 0%
back-to-indentation 1 0%
- c-remove-stale-state-cache-backwards 3 0%
c-state-balance-parens-backwards 1 0%
- c-state-literal-at 1 0%
c-state-pp-to-literal 1 0%
c-beginning-of-macro 1 0%
- c-append-to-state-cache 1 0%
c-beginning-of-macro 1 0%
c-beginning-of-macro 1 0%
- c-backward-sws 2 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
copy-tree 1 0%
c-beginning-of-macro 1 0%
- c-parse-state 7 0%
- c-parse-state-1 6 0%
- c-append-to-state-cache 4 0%
c-beginning-of-macro 1 0%
c-remove-stale-state-cache 1 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
c-forward-sws 1 0%
- c-font-lock-complex-decl-prepare 25 1%
- c-parse-state 15 1%
- c-parse-state-1 15 1%
- c-append-to-state-cache 8 0%
c-append-lower-brace-pair-to-state-cache 1 0%
- c-parse-state-get-strategy 3 0%
- c-beginning-of-macro 2 0%
back-to-indentation 2 0%
- c-get-fallback-scan-pos 1 0%
- beginning-of-defun 1 0%
beginning-of-defun-raw 1 0%
- c-remove-stale-state-cache 2 0%
- c-beginning-of-macro 2 0%
back-to-indentation 1 0%
- c-backward-sws 7 0%
- c-beginning-of-macro 5 0%
back-to-indentation 2 0%
#<compiled 0x20000000077e7950> 13 0%
#<compiled 0x20000000077e7538> 12 0%
- c-font-lock-enum-tail 11 0%
- c-backward-over-enum-header 6 0%
- c-backward-token-2 4 0%
- c-backward-sws 4 0%
c-beginning-of-current-token 1 0%
- c-parse-state 5 0%
- c-parse-state-1 4 0%
- c-remove-stale-state-cache 2 0%
c-beginning-of-macro 1 0%
c-append-to-state-cache 1 0%
c-beginning-of-macro 1 0%
#<compiled 0x20000000077e79d0> 11 0%
#<compiled 0x20000000077e7aa0> 7 0%
- c-font-lock-invalid-single-quotes 7 0%
- c-literal-limits 3 0%
c-state-full-pp-to-literal 3 0%
#<compiled 0x20000000077e7678> 7 0%
- #<compiled 0x2000000007807748> 3 0%
- c-font-lock-doc-comments 3 0%
- c-literal-start 2 0%
c-state-semi-pp-to-literal 2 0%
#<compiled 0x20000000077e7808> 2 0%
c-font-lock-enum-body 1 0%
- font-lock-fontify-syntactically-region 9 0%
syntax-ppss 7 0%
- c-before-context-fl-expand-region 77 5%
- mapc 77 5%
- #<compiled 0x20000000078876d8> 77 5%
- c-context-expand-fl-region 76 5%
- c-fl-decl-start 62 4%
- c-syntactic-skip-backward 27 1%
- c-parse-state 11 0%
- c-parse-state-1 11 0%
- c-append-to-state-cache 5 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
c-append-lower-brace-pair-to-state-cache 1 0%
- c-parse-state-get-strategy 1 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
c-remove-stale-state-cache 1 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
- c-determine-limit 17 1%
c-state-semi-pp-to-literal 9 0%
- c-determine-limit 2 0%
- c-determine-limit 1 0%
c-state-semi-pp-to-literal 1 0%
c-state-semi-pp-to-literal 1 0%
- c-literal-start 6 0%
- c-state-semi-pp-to-literal 6 0%
c-parse-ps-state-below 2 0%
- c-looking-at-or-maybe-in-bracelist 5 0%
c-backward-token-2 5 0%
- c-forward-type 3 0%
c-forward-name 2 0%
c-backward-sws 1 0%
- c-fl-decl-end 11 0%
- c-literal-start 7 0%
- c-state-semi-pp-to-literal 6 0%
c-parse-ps-state-below 1 0%
c-on-identifier 1 0%
c-forward-declarator 1 0%
- c-backward-sws 1 0%
c-beginning-of-macro 1 0%
bug-reference-fontify 2 0%
file-remote-p 3 0%
- find-image 2 0%
image-search-load-path 2 0%
- eval 1 0%
if 1 0%
- timer-event-handler 1 0%
- apply 1 0%
jit-lock-force-redisplay 1 0%
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