Uploaded image for project: 'WiredTiger'
  1. WiredTiger
  2. WT-2894

Create workload that shows negative scaling when overwhelmed

    • Type: Icon: Improvement Improvement
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • WT2.9.0, 3.2.10, 3.3.14
    • Affects Version/s: None
    • Component/s: None
    • None

      There have been a few MongoDB workloads that cause a cascading performance degradation in WiredTiger. The application is attempting to push through more workload than the system can handle, as application threads become co-opted into eviction the throughput rate reduces further.

      When the throughput rate drops, the application opens more threads to the database, attempting to keep the amount of throughput stable. As the number of threads grows, WiredTiger successfully completes less and less work.

      The bottle neck appears to be eviction. We should create a workload in standalone WiredTiger that replicates the negative scaling.

        1. wt2894_recent.png
          wt2894_recent.png
          86 kB
        2. wt2894_329.png
          wt2894_329.png
          77 kB
        3. wt2894_326.png
          wt2894_326.png
          69 kB
        4. w2894_recent_stalls.png
          w2894_recent_stalls.png
          82 kB
        5. 2894.tar.gz
          263 kB

            Assignee:
            alexander.gorrod@mongodb.com Alexander Gorrod
            Reporter:
            alexander.gorrod@mongodb.com Alexander Gorrod
            Votes:
            0 Vote for this issue
            Watchers:
            6 Start watching this issue

              Created:
              Updated:
              Resolved: