Collection Selection Based on Historical Performance for Efficient Processing

A Grid Information Retrieval (GIR) simulation was used to process the TREC Million Query Track queries. The GOV2 collection was partitioned by hostname and the aggregate performance of each host, as measured by qrel counts from the past TREC Terabyte Tracks, was used to rank the hosts in order of quality. Only the 100 highest quality hosts were included in the Grid IR simulation, representing less than 20 % of all GOV2 documents. The IR performance of the GIR simulation, as measured by the topic-averaged AP, b-pref, and Rel@10 over the TREC Terabyte-Track topics is within one standard deviation of the respective topic-averaged TREC Million Query participant median scores. Estimated AP of the Million Query topic results is comparable to the topic-averaged AP of the Terabyte topic results. 1