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From GitBox <...@apache.org>
Subject [GitHub] [incubator-tvm] tqchen opened a new pull request #5484: [REFACTOR][RPC][PROCOTOL-CHANGE] Modularize the RPC infra
Date Thu, 30 Apr 2020 03:57:02 GMT

tqchen opened a new pull request #5484:
URL: https://github.com/apache/incubator-tvm/pull/5484


   This PR refactors the RPC protocol to make it more modularized.
   
   - RPCSession: represent a set of features that need to be implemented
   - RPCEndPont: End point that forwards the RPCSession requests over a communication channel.
   - RPCModule: Exposes an RPCSession as an rpc device in the TVM Runtime API.
   
   In the new design, the local machine is presented as a special case of RPCSession.
   The remote is just another client session that calls into RPCEndPoint.
   The RPC communication path is as follows.
   
   ```
   client -> ClientSession -> EndPoint[client@n0]
   -> networking[between n0 <=> n1]
   -> EndPoint[server@n1] -> LocalSession[@n1]
   
   ```
   
   Because of the new modular design, we can now chain more sessions together.
   For example, we can now run the following proxy setup (testcase in test_runtime_rpc.test_session_constructor).
   
   ```
   client -> ClientSession -> Endpoint[client@n0]
   -> networking[between n0 <=> n1]
   -> Endpoint[server@n1] -> ClientSession -> Endpoint[client@n1]
   -> networking[between n1 <=> n2]
   -> Endpoint[server@n2] -> LocalSession[@n2]
   ```
   
   We can also implement other types of Sessions.
   For example, we could make uTVM session a special case of the RPCSession
   and use the same mechanism for session management.
   
   We also add more comments about the internal of the RPC.
   The communication protocol is simplfied using a similar convention as PackedFunc.
   This allows us to further reduce the amount of special remote syscalls.
   
   Due to the major improvement and simplification, we are making a non-compatible update
to the RPC protocol. It means that the client and server needs to be upgraded to together
in order for it to function correctly.
   
   This PR also introduces a versioning mechanism to the current RPC procotol,
   so that future upgrade will be produce more user friendly with error messages.


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