Review Request 123852: Optimize: Do not wipe dict cache when copying speller objects.

[Milian Wolff]

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https://git.reviewboard.kde.org/r/123852/
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Review request for KDE Frameworks, Laurent Montel, Martin Tobias Holmedahl Sandsmark, and Kåre Särs.


Repository: sonnet


Description
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This removes a serious performance penalty from enabling on-the-fly spell
checking in KTextEditor. For some reason, the copy assignment of a Speller
object invalidated the internal cache which happened very often from the Kate
code base. Now, the cache is kept valid and reused, and the performance is good
again. I'm not sure whether this has any unintentional side-effects, but the
tests work fine and spell checking in KatePart still looks good as well,
and is now fast again.

E.g. previously I easily ended up with heaptrack reports such as this one:

2284529 calls to allocation functions with 16.23MB peak consumption from
HashMgr::add_word(char const*, int, int, unsigned short*, int, char const*, bool)
  in /usr/lib/libhunspell-1.3.so.0
1978045 calls with 2.30MB peak consumption from:
    HashMgr::load_tables(char const*, char const*)
      in /usr/lib/libhunspell-1.3.so.0
    HashMgr::HashMgr(char const*, char const*, char const*)
      in /usr/lib/libhunspell-1.3.so.0
    Hunspell::Hunspell(char const*, char const*, char const*)
      in /usr/lib/libhunspell-1.3.so.0
    HunspellDict
      at .../sonnet/src/plugins/hunspell/hunspelldict.cpp:36
      in /home/milian/projects/compiled/kf5/lib64/plugins/kf5/sonnet/hunspell.so
    HunspellClient::createSpeller(QString const&)
      at .../sonnet/src/plugins/hunspell/hunspellclient.cpp:43
      in /home/milian/projects/compiled/kf5/lib64/plugins/kf5/sonnet/hunspell.so
    Sonnet::Loader::createSpeller(QString const&, QString const&) const
      at .../sonnet/src/core/loader.cpp:103
      in /home/milian/projects/compiled/kf5/lib64/libKF5SonnetCore.so.5
    Sonnet::Speller::Private::updateDict()
      at .../sonnet/src/core/speller.cpp:64
      in /home/milian/projects/compiled/kf5/lib64/libKF5SonnetCore.so.5
    Sonnet::Speller::Private::recreateDict()
      at .../sonnet/src/core/speller.cpp:79
      in /home/milian/projects/compiled/kf5/lib64/libKF5SonnetCore.so.5
    Sonnet::Speller::operator=(Sonnet::Speller const&)
      at .../sonnet/src/core/speller.cpp:111
      in /home/milian/projects/compiled/kf5/lib64/libKF5SonnetCore.so.5
    Sonnet::BackgroundChecker::setSpeller(Sonnet::Speller const&)
      at .../sonnet/src/core/backgroundchecker.cpp:131
      in /home/milian/projects/compiled/kf5/lib64/libKF5SonnetCore.so.5
    KateOnTheFlyChecker::performSpellCheck()
      at .../ktexteditor/src/spellcheck/ontheflycheck.cpp:405
      in /home/milian/projects/compiled/kf5/lib64/libKF5TextEditor.so.5


Diffs
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  src/core/speller.cpp 3903b42ebb4f7cb98a049fcf7a291c74dd9457e0 

Diff: https://git.reviewboard.kde.org/r/123852/diff/


Testing
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Thanks,

Milian Wolff

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