e pieces, we need a mechanism to answer the question: I want to request
blocks from this piece, which peer is the most likely to be able to deliver it
to me the soonest.</p>
<p>This question is answered by <tt class="docutils literal"><span class="pre">torrent::request_time_critical_pieces()</span></tt> in
libtorrent.</p>
<p>At a high level, this algorithm keeps a list of peers, sorted by the estimated
download queue time. That is, the estimated time for a new request to this
peer to be received. The bottom