gRPC c++ async server vs sync server

[er.z...@gmail.com]

I new to gRPC. I don't get the differences between sync and async server. 

In gRPC C++ example on [github][2]. The distinction in async and sync isn't obvious.

- According to this [question][1] and with my test, sync gRPC server can handle parallele request. 

- And in the asynchronous example the `server.Run();` is blocking.

So What's the difference between both ?

  [1]: https://stackoverflow.com/questions/45486733/simultaneous-grpc-clients-sync-async-server

  [2]:https://github.com/grpc/grpc/tree/master/examples/cpp/helloworld

[Noah Eisen]

The async model give the application code full control over threading. Sync can handle multiple requests in parallel, yes, but they are serviced from a gRPC thread pool.

If you want finer control over threading, then async is the better model to use

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[er.z...@gmail.com]

Thanks for your answer.

I also find this pdf that explain with more details the difference between async and sync server : 
https://docs.google.com/viewer?a=v&pid=forums&srcid=MDMzNjA3NDMyNTkxNjMwNTM0NDkBMTQyMDUzMjc4OTU4MzQ5NzQ3NzMBOF90WUtCZHVDZ0FKATAuMQEBdjI&authuser=0

from this message: https://groups.google.com/forum/#!topic/grpc-io/DuBDpK96B14