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  1. WiredTiger
  2. WT-3746

Don't busy wait when syncing the log and waiting for writes to complete

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    Details

    • Type: Task
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.6.0-rc5, WT3.0.0
    • Component/s: None
    • Labels:
      None
    • Sprint:
      Storage 2017-12-04

      Description

      While looking at FTDC for the insert workload from SERVER-31694, I noticed some interesting WT log statistics. Namely we are force writing the log slot almost as many times as we write a log record. MongoDB uses the in-memory mode for maximal consolidation and performance. There are a number of places where and reasons why we force out the current in-memory log records. We should investigate where these calls are coming from.

      Most of these are effectively a no-op because in attempting to force out the log records we find we can skip it because there are no outstanding records to write.

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            Assignee:
            sue.loverso Susan LoVerso
            Reporter:
            sue.loverso Susan LoVerso
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              Updated:
              Resolved: