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  1. WiredTiger
  2. WT-2894

Create workload that shows negative scaling when overwhelmed

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Details

    • Improvement
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • WT2.9.0, 3.2.10, 3.3.14
    • None
    • None

    Description

      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.

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

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              alexander.gorrod@mongodb.com Alexander Gorrod
              alexander.gorrod@mongodb.com Alexander Gorrod
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                Created:
                Updated:
                Resolved: