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  1. Qt Creator
  2. QTCREATORBUG-27152

clangd code completion slower than with libclang

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Details

    • Windows
    • 86b8f68f78 (qt-creator/qt-creator/9.0)

    Description

      I've compared a Qt Creator 7 MinGW build that uses LLVM/Clang 14.0 PGO optimized binaries with both clangd and libclang in a simple scenario:

      1. Load Qt Creator 7 project
      2. open texteditor.cpp
      3. navigate at the end of the file and do Ctrl+Space

      In the two attached screenshots you can see the difference. libclang is visibly faster than clangd.

      QtCreator7-clangd-14-mingw-optimized.mp4
      QtCreator7-libclang-14-mingw-optimized.mp4

      Attachments

        1. qtc-7.0.0-clangd-full.log
          11 kB
        2. qtc-7.0.0-clangd-full.mp4
          2.94 MB
        3. qtc-7.0.2-clangd-single.log
          10 kB
        4. qtc-7.0.2-clangd-single.mp4
          2.71 MB
        5. qtc-7.0.2-libclang.log
          221 kB
        6. qtc-7.0.2-libclang.mp4
          2.31 MB
        7. QtCreator7-clangd-14-mingw-optimized.mp4
          2.54 MB
        8. QtCreator7-libclang-14-mingw-optimized.mp4
          2.12 MB

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTCREATORBUG-27264 clangd background indexing takes forever

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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              cadam Cristian Adam
              cadam Cristian Adam
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              Dates

                Created:
                Updated:
                Resolved:

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