service handles only one socket per core

 

I am writing a server application using Boost Asio:

  • Server: Running io_service.run() from pool of threads (one thread per core), accepting connections & reading data from sockets is done asynchronously.
  • Client: Each client connects and sends a heavy file (~500MB) to the server.

    • Issue: All Clients are connected to the server (number of clients > number of server cores); io_service handles only one connection/socket per thread while data from other sockets are not processed until one of the processed connections completes.

    I would expect that data from all connected sockets gets processed by the io_service thread pool at a same time?

    What is the expected behavior? Your io_service can only invoke n handlers if you have n threads invoking io_service::run() . If the number of outstanding asynchronous operations is greater than n , their handlers will wait in the io_service queue until a thread is free to invoke them.

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