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