Hi Asif, > Can I safely assume that 0mq uses IOCP on Windows? No, it doesn't. There's a lot of discussion about that on the mailing list. Search the archives to find it. > How do you compare ZeroMQ to Boost::ASIO > performance-wise? I am not aware of any comparisons. However, if you do one, please do publish the results on zeromq.org website. Martin