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  1. Python Driver
  2. PYTHON-4640

ObjectID computation is inefficient when used in a multi-threaded environment

    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Unknown Unknown
    • 4.9
    • Affects Version/s: None
    • Component/s: Python Support
    • Python Drivers
    • Not Needed
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      1. What would you like to communicate to the user about this feature?
      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      3. Which versions of the driver/connector does this apply to?

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

      Detailed steps to reproduce the problem?

      If you call `insert_many()` from two different threads that are being run concurrently, the ObjectId generation will regenerate the random number used for the id each time the threads swap.  This ends up spending a lot of cpu time generating random numbers rather than actually inserting documents.

      Definition of done: what must be done to consider the task complete?

      Swapping threads wouldn't slow down compared to not swapping threads.  That is, using a thread pool shouldn't make inserts substantially slower.

      The exact Python version used, with patch level:

      $ python -c "import sys; print(sys.version)"

      3.11.9 (main, Aug  6 2024, 13:17:01) [GCC 13.2.0]

      The exact version of PyMongo used, with patch level:

      $ python -c "import pymongo; print(pymongo.version); print(pymongo.has_c())"

      4.8.0
      True

      Describe how MongoDB is set up. Local vs Hosted, version, topology, load balanced, etc.

      docker of mongo:latest

      The operating system and version (e.g. Windows 7, OSX 10.8, ...)

      Ubuntu 24.04

      Web framework or asynchronous network library used, if any, with version (e.g. Django 1.7, mod_wsgi 4.3.0, gevent 1.0.1, Tornado 4.0.2, ...)

      Security Vulnerabilities

      If you’ve identified a security vulnerability in a driver or any other MongoDB project, please report it according to the instructions here

            Assignee:
            shane.harvey@mongodb.com Shane Harvey
            Reporter:
            david.manthey@kitware.com David Manthey
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              Created:
              Updated:
              Resolved: