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Connection establishment
UCT supports either connecting to a remote interface, or connecting to a remote endpoint (p2p mode).
When connecting to an interface, need to create endpoint with uct_ep_create_connected()
, and the endpoint can be used immediately. When connecting to a remote endpoint, need to create an endpoint using uct_ep_create()
and then connect it using uct_ep_conenct()
. This endpoint can be use only after remote side has connected its endpoint as well.
UCP, on the other hand, exposes only one-sided semantics: ucp_ep_create()
would create an endpoint which could be used immediately for communications to a remote worker.
Therefore, UCP has to implement a connection establishment protocol - wireup - which would bridge this gap and support the following scenarios:
- Establish connection over p2p transport.
- Create endpoint for sending replies back, for one-sided transports.
- Use multiple transports for different types of operations.