16. The apparatus as recited in claim 15 , wherein the lists that have been truncated from the plurality of processes are merged into a global topicality list.
16. The apparatus as recited in claim 15 , wherein the lists that have been truncated from the plurality of processes are merged into a global topicality list. 17. The apparatus as recited in claim 16 , wherein one or more of the processors further rank and truncate the global topicality list.