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  1. Core Server
  2. SERVER-12428

2.5.4 seems significantly slower than 2.4.x releases

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: 2.5.4
    • Fix Version/s: 2.5.5
    • Component/s: Performance
    • Labels:
      None
    • Environment:
      linux
    • Operating System:
      Linux
    • Steps To Reproduce:
      Hide

      Don't think I'm doing anything special. Just doing a large volume of queries should do it.

      Show
      Don't think I'm doing anything special. Just doing a large volume of queries should do it.

      Description

      I have started using 2.5.4 for development (as I am using the new $min and $max operators). Noticed performance is much worse than 2.4.x versions.
      Apologies if this is already a known error. Have searched for duplicate issue but can't find one.

      Criteria:
      I am volume testing using pymongo on amazon EC2. Mongod is running on an m1.large instance and I am querying from a separate box within the same availability zone.
      Start 100 paralllel processes (each with its own MongoClient). Each process makes 3000 find queries across 3 different collections.
      On 2.4.9, I see a throughput of approx 7200 queries / second.

      If I switch to the 2.5.4 64bit linux binaries, my throughput drops to around 3500 queries / second.

      Performance graphs included. Further info available on request.

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                Updated:
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