On 09/28/2011 02:31 PM, Whit Armstrong wrote: > I modified the code to use HWM=1, but the sender still manages to send > more than 10 messages even if I only call zmq_recv once on the PULL > socket. There's just 1 message in the 0MQ queue, the rest of the messages you see to be in flight are stored in TCP buffers. Martin