>With overlapped IO the amount of buffer memory you need is more by a factor of a thousand because each idle socket still requires a buffer to be allocated to i

>With overlapped IO the amount of buffer memory you need is more by a factor of a thousand because each idle socket still requires a buffer to be allocated to it. Use the select function then. Wait for completion of that instead. No need to allocate buffers for sockets that receive messages infrequently. epoll is a horribly designed API. It should absolutely not be replicated on other platforms.