What language of gRPC? That'll allow me to route it to the correct person 
to answer.

On Sunday, September 18, 2022 at 9:29:16 AM UTC-4 Timo wrote:

> I did research on this topic but did not find detailed information in the 
> documentation yet.
> How exactly does the thread model of the new callback API work?
>
> When using the synchronous API, the thread model I guess is this:
> - grpc owns threads, number can be limited
> - Several RPCs can operate on one thread, but there's a limit
> - When too many RPCs are open, the client receives a "resource exhausted"
> - An application with multiple clients needs at least one thread per each 
> open RPC.
>
> In the callback (not asynchronous) API, I understand:
> - grpc owns threads and spawns new threads if needed
> - multiple RPCs can be handled on one thread non-blocking
> For the server, I wonder how this scales with many (don't have a number in 
> mind) RPCs being open. Assuming all 16 threads are spawned, how many RPCs 
> can I operate?
> Assuming I have an application with multiple clients implemented, each 
> connecting to different servers.
> Would all the clients be able to share the same thread pool, or would (in 
> worst case) each client spawn 16 threads?
>
> Especially when designing microservices where each service offers a 
> server, but can be a client to another service it may be important to not 
> scale threads too much.
>
> Thanks
>

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