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rust: Preallocate the returned `Vec` in `utils::files::relativize_path` Profiling `rhg files > /dev/null` on an old snapshot of mozilla-central (with `perf` and the Firefox Profiler: https://github.com/firefox-devtools/profiler/blob/main/docs-user/guide-perf-profiling.md) showed non-trivial time spend in this function and in `realloc`. This change makes the wall-clock time for that process on my machine go from ~190 ms to ~150 ms. Differential Revision: https://phab.mercurial-scm.org/D10199
author Simon Sapin <simon.sapin@octobus.net>
date Sat, 13 Mar 2021 08:59:03 +0100
parents a492610a2fc1
children
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Augie Fackler <augie@google.com>
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1 Our full contribution guidelines are in our wiki, please see:
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2
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3 https://www.mercurial-scm.org/wiki/ContributingChanges
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4
a492610a2fc1 contributing: add new file with a pointer to the wiki
Augie Fackler <augie@google.com>
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5 If you just want a checklist to follow, you can go straight to
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6
a492610a2fc1 contributing: add new file with a pointer to the wiki
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7 https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
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8
a492610a2fc1 contributing: add new file with a pointer to the wiki
Augie Fackler <augie@google.com>
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9 If you can't run the entire testsuite for some reason (it can be
a492610a2fc1 contributing: add new file with a pointer to the wiki
Augie Fackler <augie@google.com>
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10 difficult on Windows), please at least run `contrib/check-code.py` on
a492610a2fc1 contributing: add new file with a pointer to the wiki
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11 any files you've modified and run `python contrib/check-commit` on any
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12 commits you've made (for example, `python contrib/check-commit
a492610a2fc1 contributing: add new file with a pointer to the wiki
Augie Fackler <augie@google.com>
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13 273ce12ad8f1` will report some style violations on a very old commit).