On Mon, Sep 17, 2012 at 6:54 AM, Kangmo Kim <kangmo.kim at thankyousoft.com> wrote: > ZMQ_HWM : > Both PUB and SUB uses the default value 0 (unlimitted). I double checked it > with getsockopt. What version of 0MQ are you using? In 3.x the default HWM was set to 1,000. -Pieter