he number of items processed by a</span></div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;      <span class="comment">// single thread and reduces the impact of initialization overhead.</span></div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;      block_size = (block_size &lt; 128 ? block_size : 128);</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;    }</div><div class="line"><a name="l00060"></a><span cl