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copied!<p>Whether the socket blocks or drops messages depends on the socket type as described in the <a href="http://zeromq.github.com/rbzmq/classes/ZMQ/Socket.html" rel="noreferrer">ZMQ::Socket documentation</a> (emphasis below is mine):</p> <blockquote> <p>ZMQ::HWM: Retrieve high water mark</p> <p>The ZMQ::HWM option shall retrieve the high water mark for the specified socket. The high water mark is a hard limit on the maximum number of outstanding messages 0MQ shall queue in memory for any single peer that the specified socket is communicating with.</p> <p><strong>If this limit has been reached the socket shall enter an exceptional state and depending on the socket type, 0MQ shall take appropriate action such as blocking or dropping sent messages.</strong> Refer to the individual socket descriptions in ZMQ::Socket for details on the exact action taken for each socket type.</p> <p>The default ZMQ::HWM value of zero means “no limit”.</p> </blockquote> <p>You can see if it will block or drop by looking through the documentation for the socket type for <code>ZMQ::HWM option action</code> which will either be <code>Block</code> or <code>Drop</code>.</p> <p>The action for <code>ZMQ::PUB</code> is <code>Drop</code>, so if it is not dropping you should check the HWM (High Water Mark) value and heed the warning that <strong>The default ZMQ::HWM value of zero means “no limit”,</strong> meaning that it will not enter an exceptional state until the system runs out of memory (at which point I don't know how it behaves).</p>

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