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  1. MariaDB Server
  2. MDEV-10064

performance regression with threadpool

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Not a Bug
    • Affects Version/s: 10.0.25, 10.1.14
    • Fix Version/s: 10.1.25
    • Component/s: OTHER
    • Labels:
    • Environment:
      Ubuntu x86_64
    • Sprint:
      10.0.26, 10.0.28, 5.5.55, 10.0.30

      Description

      Enabling the thread pool leads to about 5% performance loss in MariaDB 10.0 and 10.1, but not in MariaDB 5.5. I tested 5.5.49 vs. 10.0.25 vs. 10.1.14.

      The benchmark is sysbench OLTP read-only with 1000 point-selects per transaction. The benchmark machine has 16 cores (32 hyperthreads).

      my.cnf:

      [mysqld]
      max_connections = 1300
      table_open_cache = 2600
      query_cache_type = 0
       
      innodb_buffer_pool_size = 512M
      innodb_buffer_pool_instances = 10
      innodb_adaptive_hash_index_partitions = 20
       
      thread_handling=pool-of-threads
      

      See attached spread sheet for numbers.

        Attachments

        1. one_thread.txt
          77 kB
          Vladislav Vaintroub
        2. pool.txt
          77 kB
          Vladislav Vaintroub
        3. threadpool.ods
          56 kB
          Axel Schwenke
        4. tp10.png
          60 kB
          Axel Schwenke
        5. tp1000.png
          57 kB
          Axel Schwenke

          Activity

            People

            Assignee:
            axel Axel Schwenke
            Reporter:
            axel Axel Schwenke
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              Dates

              Created:
              Updated:
              Resolved:

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