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  1. Qt
  2. QTBUG-127178

QProtobufSerializer deserialization performance issue

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Details

    • Bug
    • Resolution: Fixed
    • 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.

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          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
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              photonlili Li Xu
              photonlili Li Xu
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                Created:
                Updated:
                Resolved:

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