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  1. MariaDB Server
  2. MDEV-19167

Add stall-related status variables to thread pool

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    Details

    • Type: Task
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Won't Do
    • Fix Version/s: N/A
    • Component/s: Variables
    • Labels:
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      Description

      It might make sense to add some stall-related status variables to the Unix implementation of the thread pool.

      Maybe like:

      • Threadpool_stalled_thread_groups

      This could get incremented if the timer thread detects a stall. Around here:

      https://github.com/MariaDB/server/blob/3503fbbebf90cb0fe63993a66dad9bf97fb74c0a/sql/threadpool_generic.cc#L735

      • Threadpool_throttled_thread_creations

      This could get incremented if the timer thread does not create a new worker thread when a stall is detected because the thread group was still within the throttling interval. Around here:

      https://github.com/MariaDB/server/blob/3503fbbebf90cb0fe63993a66dad9bf97fb74c0a/sql/threadpool_generic.cc#L1025

      • Threadpool_oversubscribed_thread_groups

      This could get incremented every time a thread has to go to sleep because the thread group already has thread_pool_oversubscribe active threads. Around here:

      https://github.com/MariaDB/server/blob/3503fbbebf90cb0fe63993a66dad9bf97fb74c0a/sql/threadpool_generic.cc#L1218

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              Assignee:
              wlad Vladislav Vaintroub
              Reporter:
              GeoffMontee Geoff Montee
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                Updated:
                Resolved:

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