jiajuncao

Application hangs when certain handlers are registered at fork

1

If the application registers a handler during ```fork()``` using ```pthread_atfork()```, the handler is called with the execution lock acquired, before ```fork()``` returns. If the handler tries to grab the lock...

Remove single host processing from restart script.

3

We need to use the RM plugin processing even it's a single-host computation. Not 100% sure if multiple host processing can cover the single host case, but it looks good...