findOne queries on _id field are slower in 2.6/2.4 than in 2.2

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    • Type: Bug
    • Resolution: Duplicate
    • Priority: Major - P3
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    • Affects Version/s: 2.4.8, 2.5.4
    • Component/s: Concurrency, Querying
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    • Environment:
      Linux ip-10-237-131-70 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
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      Queries of the kind

      db.foo.findOne({_id: 0})

      are about 5% slower in 2.6 than in 2.2 on heavy-multithreaded tests (8-16 threads), screenshot attached.

        1. Screenshot 2014-01-12 18.47.59.png
          Screenshot 2014-01-12 18.47.59.png
          1.14 MB

            Assignee:
            Davide Italiano (Inactive)
            Reporter:
            Davide Italiano (Inactive)
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              Created:
              Updated:
              Resolved: