Daemon Threads, thread count, and total started thread count

Question

I have a simple code for a multi-threaded echo server in Java (it returns whatever received back to the clients). I\'m profiling various resources of the server including the th

Answer 1

I'm not sure what you use to receive those connections, but usually frameworks that handle TCP connections non-blocking like Netty use a master thread to listen to the port and a thread pool to handle incomming connections. This means it will at least open 2 threads for the incomming connection if the thread-pool is limited to 1 thread.

See this example from the netty page, where 2 NioEventLoopGroups are used while bootstrapping the server.

The 2 threads are necessary to not block incoming traffic.