1. If specified '--mca btl tcp,self', which interface application will run on, use GigE adaper OR use the OpenFabrics interface in IP over IB mode (just like a high performance GigE adapter) ?
2. If '--mca btl tcp,self' forced application to use GigE adapter, how to force application to use OpenFabrics interface in IP over IB mode
3. Does app run slower in IP over IB mode than RDMA mode?
Appreciating your kindly help