Version –
Mongod RC11binaries

Environment:

• Single mongod with wiredtiger as storage engine
• Windows 2012
• WriedTiger configured with 1GB cache
• EC2 machine c3.large

Workload:

• Used hammer.mongo to do insert only workload
• The machine throughput dropped by 40% after 17 hours of execution

Will continue and investigate this issue

At this stage

• This is the 2nd repro of the same problem, when I analyzed the dump, I found a huge internal heap fragmentation (see more details on the comment)

• No indication that client stress tool slow down (I observed steady amount of incoming TCP connection per/sec and TCP connection established remained stable)

Next plan – Keep it running to death and debug it when the throughput is significant low.