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  1. Java Driver
  2. JAVA-220

CLONE -performance impact with multiple concurrent queries

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Duplicate
    • Affects Version/s: 2.3
    • Fix Version/s: None
    • Component/s: Performance
    • Labels:
      None
    • Environment:
      Ubuntu 10.04 x64, mongodb-unstable 20101028, mongo-java-driver 2.3, quadcore, 3.2G RAM

      Description

      when running my testcase (attachment)
      i get these values back:

      ========================================================================================
      Testname: 1 Thread
      	# of Threads:   1
      	# of Loops:     400
      	# of values:     400
      	Average Returned Values:  100
      	Average Time:   53ms
      ========================================================================================
      ========================================================================================
      Testname: 5 Thread
      	# of Threads:   5
      	# of Loops:     800
      	# of values:     4000
      	Average Returned Values:  100
      	Average Time:   196ms
      ========================================================================================
      ========================================================================================
      Testname: 10 Thread
      	# of Threads:   10
      	# of Loops:     40
      	# of values:     400
      	Average Returned Values:  100
      	Average Time:   458ms
      ========================================================================================
      ========================================================================================
      Testname: 20 Thread
      	# of Threads:   20
      	# of Loops:     20
      	# of values:     400
      	Average Returned Values:  100
      	Average Time:   1020ms
      ========================================================================================
       

      so 20 threads use approx 988ms per query,
      one thread uses approx 53ms, so 20 concurrent requests seem to increase the query time by factor 20 ...
      is this to be expected? is this a known issue? can we tweak it somewhere?

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              • Created:
                Updated:
                Resolved: