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  1. MariaDB Server
  2. MDEV-26935

Improve MDL to be scalable with many thousands OS threads

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    • Task
    • Status: Open (View Workflow)
    • Major
    • Resolution: Unresolved
    • 11.5
    • Locking
    • None

    Description

      In MDEV-26873, a high contention workload is run with 10K concurrent users using default --thread-handling=one-thread-per-connection. The throughput is very low, and the main bottleneck is find_deadlock() by the MDL.

      it does much better with pool-of-threads, even with thread-pool-max-threads=1000, but one can argue that fixing/relaxing this bottleneck could be important.

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              wlad Vladislav Vaintroub
              wlad Vladislav Vaintroub
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                Updated:

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