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  1. Core Server
  2. SERVER-17111

Performance minimum at wiredTigerConcurrentWriteTransactions=16

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    Details

    • Type: Bug
    • Status: Open
    • Priority: Major - P3
    • Resolution: Unresolved
    • Affects Version/s: 3.0.0-rc7
    • Fix Version/s: Backlog
    • Component/s: Storage
    • Labels:
      None
    • Operating System:
      ALL

      Description

      For a constant load, as wiredTigerConcurrentWriteTransactions is varied a minimum in performance is seen at a value of 16 concurrent write transactions.

      Tests below on 6-CPU VMware machine.

      Insert-only workload, 64 clients:

      Mixed (but write-heavy) workload of inserts, updates, queries, 512 clients:

      Profile and stats showing effect of changing from (effectively) unlimited to limit of 16 during the middle of a run:

        Attachments

        1. insert.png
          insert.png
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        2. insert-profile.png
          insert-profile.png
          333 kB
        3. insert-ss.png
          insert-ss.png
          138 kB
        4. mixed.png
          mixed.png
          11 kB

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              Dates

              • Created:
                Updated: