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Subject: bug#47419: 27.1; slow running of snippet which reorders the file
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This is a multi-part message in MIME format.
--b1_iVtHRLNbx1Df3SzaoIoT5Rxm1rGg81oIckyr0BcGk
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As discussed on emacs-help=C2=A0 I'm posting this example here which
reorders the file and runs slowly.
Though it's an sql dump file with long lines, the file is navigable without
any problem or slowness. Only this snippet runs slowly.
Here's the snippet:
(progn
(goto-char (point-min))
(when (search-forward "INSERT INTO `test2` (`aa`, `bb`) VALUES" nil t)
(beginning-of-line)
(while (looking-at "INSERT INTO `test2`.+,\\([0-9]+\\));")
(let ((item (match-string 1))
(line (buffer-substring (line-beginning-position) (line-end-pos=
ition))))
(message item)
(save-excursion
(re-search-backward (concat "INSERT INTO `test1`.+"
"VALUES ("
item
","))
(end-of-line)
(insert "\n" line))
(delete-region (line-beginning-position) (1+ (line-end-position)))
))))
And the example file to run it on is attached. (anonymized sql dump)
--b1_iVtHRLNbx1Df3SzaoIoT5Rxm1rGg81oIckyr0BcGk
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Content-Transfer-Encoding: base64
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Subject: bug#47419: 27.1; Misleading profiler info
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retitle 47419 Misleading profiler info
thanks
> As discussed on emacs-help=A0 I'm posting this example here which
> reorders the file and runs slowly.
[ Right, but the issue was with the profiler info. ]
> Though it's an sql dump file with long lines, the file is navigable witho=
ut
> any problem or slowness. Only this snippet runs slowly.
I think I can explain to you why it's going slow:
> (re-search-backward (concat "INSERT INTO `test1`.+"
> "VALUES ("
> item
> ","))
The ".+" will first match the whole long rest of the line, after which
the regexp matcher will try to match "VALUES (item,", which will fail,
so the matcher will go back trying with .+ matching one char less, and
try to match "VALUES (item," again, etc for every char on the long line.
You can speed it up significantly by tightening the regexp,
e.g. replacing .+ with [\s\t]+. It's still not superfast because our
regexp engine is not tuned for that kind of situation, but it's better.
> And the example file to run it on is attached. (anonymized sql dump)
And the real problem (the one for which I wanted the bug report) is that
the profiler indeed gives a bogus profile (see below) where
`re-search-backwards` doesn't appear at all and all the time is
attributed to `save-excursion` instead.
-- Stefan
16896 99% - command-execute
16896 99% - call-interactively
16844 99% - funcall-interactively
16812 99% - ielm-return
16812 99% - ielm-send-input
16810 99% - ielm-eval-input
16810 99% - eval
16810 99% - progn
16810 99% - when
16810 99% - if
16808 99% - progn
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From: Stefan Monnier <monnier@HIDDEN>
To: scame <laszlomail@HIDDEN>
Subject: Re: bug#47419: 27.1; Misleading profiler info
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retitle 47419 Misleading profiler info
thanks
> As discussed on emacs-help=A0 I'm posting this example here which
> reorders the file and runs slowly.
[ Right, but the issue was with the profiler info. ]
> Though it's an sql dump file with long lines, the file is navigable witho=
ut
> any problem or slowness. Only this snippet runs slowly.
I think I can explain to you why it's going slow:
> (re-search-backward (concat "INSERT INTO `test1`.+"
> "VALUES ("
> item
> ","))
The ".+" will first match the whole long rest of the line, after which
the regexp matcher will try to match "VALUES (item,", which will fail,
so the matcher will go back trying with .+ matching one char less, and
try to match "VALUES (item," again, etc for every char on the long line.
You can speed it up significantly by tightening the regexp,
e.g. replacing .+ with [\s\t]+. It's still not superfast because our
regexp engine is not tuned for that kind of situation, but it's better.
> And the example file to run it on is attached. (anonymized sql dump)
And the real problem (the one for which I wanted the bug report) is that
the profiler indeed gives a bogus profile (see below) where
`re-search-backwards` doesn't appear at all and all the time is
attributed to `save-excursion` instead.
-- Stefan
16896 99% - command-execute
16896 99% - call-interactively
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16812 99% - ielm-send-input
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16810 99% - progn
16810 99% - when
16810 99% - if
16808 99% - progn
16808 99% - while
16808 99% - let
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