[SERVER-17838] Find operations slow down over time as results of heap contention under stress Created: 01/Apr/15  Updated: 26/Sep/15  Resolved: 26/Sep/15

Status: Closed
Project: Core Server
Component/s: Querying
Affects Version/s: None
Fix Version/s: None

Type: Bug Priority: Major - P3
Reporter: Eitan Klein Assignee: Eitan Klein
Resolution: Incomplete Votes: 0
Labels: 32qa
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Attachments: PNG File ProfilerHeap.png     JPEG File heapContention.jpg    
Operating System: ALL
Participants:

 Description   

Environment:
771f17-2015-03-30\bin>mongo.exe --version
MongoDB shell version: 3.0.2-pre-

Stand alone Mongod, configured on Windows

Test:

  • Hammer.Mongo - query only profile

Expected - Steady state throughput.
Actual - Throughput slow down, more parallel query lower throughput

  1. See attached graph that highlight contention vs. I/O operation per sec
  2. Profiler output highlight the malloc/free as hot function

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