Peloton crashes at bootstrap without command parameters on 4 sockets and 144 hardware threads big machine.

[lisihao]

Machine configuration：

1. 4 soclets，144 hardware threads，Ubuntu14.04 LTS
2. I compiled peloton without errors

Using peloton command without parameters，peloton crashed with “setting” error. I use “Pelot -connection_thread_count=64” then it was ok. I trace to the root cause and find that the SETTING_in（connection_thread_count，“number of connection treads......”，std：：tread：：hardware_concurrency（），1，64，false，fasle） caused the error，because my hardware threads larger than 64.