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  1. Qt
  2. QTBUG-127178

QProtobufSerializer deserialization performance issue

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Details

    • Bug
    • Resolution: Unresolved
    • P2: Important
    • None
    • 6.7, 6.8.0 Beta2
    • Protocol Buffers
    • None
    • All

    Description

      I have a protobuf structure with over 100 fields.

      When using the raw protoc tool to generate the .cc and .h files, and using the ParseFromArray function, it takes about 600ms to deserialize a total of 150k elements from a byte array.

      However, it takes much longer when I switch to using Qt's built-in protobuf plugin. With QProtobufSerializer, it takes more than 2 seconds to deserialize only 10k elements.

      I'm wondering if this behavior is by design or if I'm misusing the code, causing the performance issue.

      Attachments

        1. pbtest.zip
          337 kB
          Li Xu

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-124594 Protobuf deserialization is slow and the bottleneck for a vectormap application

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          For Gerrit Dashboard: QTBUG-127178
          # Subject Branch Project Status CR V
          578094,2 wip: optimize qstring deserialization dev qt/qtgrpc Status: NEW -2 +1

          Activity

            People

              tatiana.borisova Tatiana Borisova
              photonlili Li Xu
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              Dates

                Created:
                Updated:

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