Uploaded image for project: 'Java Driver'
  1. Java Driver
  2. JAVA-5680

Investigate connection pool scaling limitation

XMLWordPrintableJSON

    • Type: Icon: Task Task
    • Resolution: Unresolved
    • Priority: Icon: Major - P3 Major - P3
    • None
    • 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.

        1. image-2024-10-30-12-49-09-756.png
          image-2024-10-30-12-49-09-756.png
          255 kB
        2. image-2024-10-30-12-50-43-170.png
          image-2024-10-30-12-50-43-170.png
          646 kB
        3. oncpu.html
          595 kB
        4. java_merged_off.svg
          372 kB

            Assignee:
            valentin.kovalenko@mongodb.com Valentin Kavalenka
            Reporter:
            daniel.hill@mongodb.com Daniel Hill
            Votes:
            0 Vote for this issue
            Watchers:
            5 Start watching this issue

              Created:
              Updated: