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epriestley e2cf1e4288 Skip copied code detection for changes that are too large for it to be useful
Summary:
Ref T13210. See PHI944. When parsing certain large diffs (the case in PHI944 is an 2.5-million line JSON diff), we spend ~66% of runtime and ~80% of memory doing copy detection (the little yellow bar which shows up to give you a hint that code was moved around within a diff).

This is pretty much pointless and copy hints are almost certainly never useful on large changes. Instead, just bail if the change is larger than some arbitrary "probably too big for copy hints to ever be useful" threshold (here, 65535 lines).

Test Plan:
Roughly, ran this against a 2.5 million line JSON diff:

```
$changes = id(new ArcanistDiffParser())->parseDiff($raw_diff);
$diff = DifferentialDiff::newFromRawChanges($viewer, $changes);
```

Before the changes, it took 20s + 2.5GB RAM to parse. After the changes, it took 7s + 500MB RAM to parse.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13210

Differential Revision: https://secure.phabricator.com/D19748
2018-10-20 03:36:34 -07:00
bin Add a "lock log" for debugging where locks are being held 2018-03-05 17:55:34 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Add profile images to Repositories 2017-06-12 07:51:39 -07:00
resources Add an explicit "max-width" to PHUIDocumentPro pages to force large tables to scroll 2018-10-01 13:15:59 -07:00
scripts Remove outdated "rebuild_summaries.php" script 2018-09-06 08:18:47 -07:00
src Skip copied code detection for changes that are too large for it to be useful 2018-10-20 03:36:34 -07:00
support Append the intermediate chain to the "cert" parameter in Aphlict 2018-06-26 19:34:28 +00:00
webroot Add an explicit "max-width" to PHUIDocumentPro pages to force large tables to scroll 2018-10-01 13:15:59 -07:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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