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bug#59641: term is very slow
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From: |
Akib Azmain Turja |
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Subject: |
bug#59641: term is very slow |
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Date: |
Sat, 17 Dec 2022 00:29:02 +0600 |
Eli Zaretskii <eliz@gnu.org> writes:
>> Date: Mon, 28 Nov 2022 02:00:29 +0600
>> From: Akib Azmain Turja via "Bug reports for GNU Emacs,
>> the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>>
>> Term mode is very slow. On my computer, Coterm is 2-3x faster than
>> term, and my own terminal emulator, Eat, is 4-5x faster.
>>
>> I tried to profile Term. Steps:
>>
>> 1. emacs -Q (+ -nw, environment variable DISPLAY was unset)
>> 2. M-x profiler-start RET cpu+mem RET
>> 3. M-x term
>> 4. Run the following stupid command:
>> timeout 1 bash -c 'i=0 ; while true ; do echo $i ; i=$((i+1)) ; done'
>> Note I also run emacs -nw in before this command.
>> 5. Wait for finishing.
>> 6. M-x profiler-stop
>> 7. M-x profiler-report
>>
>> Here are the reports (attached), but don't seem to be human readable:
>
> Copy them from the display shown by profiler-report, after you expand it
> completely.
>
> And the "cpu" profile is enough; the "mem" one doesn't add anything useful.
Sorry, I missed this reply. I found this in debbugs.gnu.org. :O
Here is the data: (I didn't redo the steps, I just did
'M-x profiler-find-profile RET path/to/profile'. ;) )
--8<---------------cut here---------------start------------->8---
9397 95% - term-emulate-terminal
2710 27% - term-handle-ansi-escape
1831 18% - term-down
8 0% term-move-columns
765 7% - term-goto
714 7% term-down
82 0% - term--handle-colors-list
66 0% - term--color-as-hex
34 0% - face-background
34 0% - face-attribute
20 0% - face-attribute-merged-with
16 0% face-attribute
6 0% face-attribute
32 0% - face-foreground
20 0% - face-attribute
8 0% face-attribute
1846 18% - term-down
68 0% - vertical-motion
68 0% - jit-lock-function
68 0% - jit-lock-fontify-now
28 0% - jit-lock--run-functions
8 0% - #<compiled -0x1552f4e0aae95e03>
8 0% - font-lock-fontify-region
8 0% - font-lock-default-fontify-region
8 0% font-lock-unfontify-region
8 0% - #<compiled -0x1554fa224e318f03>
8 0% - font-lock-fontify-region
8 0% font-lock-default-fontify-region
4 0% - #<compiled -0x1546c88d0dca1d03>
4 0% - font-lock-fontify-region
4 0% - font-lock-default-fontify-region
4 0% font-lock-extend-region-wholelines
4 0% - #<compiled -0x1546c2ed8adb7d03>
4 0% font-lock-fontify-region
68 0% - term-insert-char
28 0% jit-lock-after-change
28 0% term-move-columns
379 3% - vertical-motion
363 3% - jit-lock-function
317 3% - jit-lock-fontify-now
155 1% - run-with-timer
155 1% - run-at-time
100 1% - timer-activate
96 0% - timer--activate
8 0% timer--time-less-p
20 0% timer-set-time
98 0% - jit-lock--run-functions
22 0% - #<compiled -0x1552ff392e9c9603>
22 0% font-lock-fontify-region
20 0% - #<compiled -0x1552f71a36b2fc03>
20 0% - font-lock-fontify-region
20 0% - font-lock-default-fontify-region
20 0% - font-lock-extend-region-wholelines
20 0% syntax-propertize-wholelines
20 0% - #<compiled -0x1546fd5b53d9da03>
20 0% - font-lock-fontify-region
20 0% font-lock-default-fontify-region
12 0% - #<compiled -0x1552f745b3231203>
12 0% - font-lock-fontify-region
12 0% - font-lock-default-fontify-region
12 0% font-lock-extend-region-wholelines
12 0% - #<compiled -0x1540fac747b55603>
12 0% - font-lock-fontify-region
12 0% - font-lock-default-fontify-region
12 0% font-lock-unfontify-region
8 0% #<compiled -0x1540fac747b55603>
4 0% - #<compiled -0x1540f619efa85203>
4 0% - font-lock-fontify-region
4 0% font-lock-set-defaults
235 2% - term-move-columns
10 0% term-move-to-column
137 1% term-handle-deferred-scroll
111 1% jit-lock-after-change
24 0% - redisplay_internal (C function)
8 0% - term--update-term-menu
8 0% - easy-menu-change
8 0% - easy-menu-add-item
8 0% - easy-menu-get-map
8 0% - mapcar
8 0% - #<compiled 0x12afad0b062c4ebb>
8 0% easy-menu-lookup-name
8 0% - jit-lock-function
8 0% - jit-lock-fontify-now
8 0% - jit-lock--run-functions
4 0% - #<compiled -0x1540fe59cc42d603>
4 0% - font-lock-fontify-region
4 0% font-lock-set-defaults
4 0% - #<compiled -0x1540fe59cc42d603>
4 0% font-lock-fontify-region
8 0% - eval
4 0% if
12 0% syntax-ppss-flush-cache
12 0% - timer-event-handler
12 0% - apply
4 0% - show-paren-function
4 0% - show-paren--default
4 0% syntax-ppss
8 0% - eval
8 0% if
4 0% - jit-lock-function
4 0% - jit-lock-fontify-now
4 0% - jit-lock--run-functions
4 0% #<compiled -0x1546deb559806303>
347 3% - ...
347 3% Automatic GC
127 1% - command-execute
82 0% - funcall-interactively
77 0% - execute-extended-command
65 0% - command-execute
53 0% - byte-code
26 0% - require
26 0% byte-code
4 0% - read-shell-command
4 0% read-from-minibuffer
8 0% funcall-interactively
4 0% - defvar
4 0% byte-code
4 0% term-send-raw
45 0% - byte-code
45 0% - read-extended-command
45 0% - read-extended-command-1
40 0% - completing-read-default
11 0% - timer-event-handler
11 0% - apply
7 0% #<subr
F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_9>
4 0% - show-paren-function
2 0% show-paren--default
3 0% #<compiled -0xa873503662230e4>
6 0% - timer-event-handler
6 0% - apply
4 0% - #<compiled -0xb30f43a056c4866>
4 0% - execute-extended-command--shorter
4 0% #<compiled 0x1a044bbfab7de9f2>
2 0% - show-paren-function
2 0% buffer-match-p
2 0% - redisplay_internal (C function)
2 0% - redisplay--pre-redisplay-functions
2 0% - run-hook-with-args
2 0% redisplay--update-region-highlight
--8<---------------cut here---------------end--------------->8---
--
Akib Azmain Turja, GPG key: 70018CE5819F17A3BBA666AFE74F0EFA922AE7F5
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- bug#59641: term is very slow,
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