Some questions of DFL to support clustering

[Noah Yan]

Hi,

Per my understanding, dragonfly designed to be high performance for SMP, and 
later scale up to a single system image for clustering. In current work, is 
there any topics covering effecient inter-node (inter-box) communication? I 
mean not the fast TCP/IP, but some more effecient and less complex protocol 
for fast message passing between two OSes. And also some topics for 
collective communication in clustering or SMP?

Also, seem to me that DFL put the scheduler to userland which I like very 
much because lots of application-specific co-scheduling protocol in 
clustering can be developed on it. But how much the scheduling is push to 
userland, completely, or partially.

User-land process/thread control: any new interface from  userland to 
control a thread/process? These should be important if put scheduler to 
userland. Can I put a process/thread purposely to a waiting state or 
sleeping state?

Thanks very much.
Noah Yan