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  1. Java Driver
  2. JAVA-5680

Investigate connection pool scaling limitation

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    • Type: Icon: Task Task
    • Resolution: Unresolved
    • Priority: Icon: Major - P3 Major - P3
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    • Affects Version/s: None
    • Component/s: Connection Management
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    • Java Drivers

      A modified YCSB 100 ping workload without ssl cannot scale vertically past 300 kops/s no matter how many threads you specify in YCSB. Offcpu flamegraph shows unsafe_park mutex

      Unsafe_Park is being called inside ConcurrentPool.get() and ConcurrentPool.release() where it calls lockInterruptiblyUnfair(). I believe this is the culprit.

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          Daniel Hill
        2. image-2024-10-30-12-50-43-170.png
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          Daniel Hill
        3. java_merged_off.svg
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          Daniel Hill
        4. oncpu.html
          595 kB
          Daniel Hill

            Assignee:
            valentin.kovalenko@mongodb.com Valentin Kavalenka
            Reporter:
            daniel.hill@mongodb.com Daniel Hill
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              Created:
              Updated: