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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
    • None
    • 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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        3. oncpu.html
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        4. java_merged_off.svg
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            Assignee:
            valentin.kovalenko@mongodb.com Valentin Kavalenka
            Reporter:
            daniel.hill@mongodb.com Daniel Hill
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              Created:
              Updated: