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Multi-core processors based SMP servers have become building blocks for Linux clusters in recent years because they can deliver better performance for multi-threaded programs through on-chip multi-threading. However, a relative slow software barrier can hinder the performance of a data-parallel scientific application on a multi-core system. In this paper we study the performance of different software barrier algorithms on a server based on newly introduced AMD quad-core Opteron processors. Wedoi:10.1109/nas.2008.27 dblp:conf/iwnas/ChenW08 fatcat:t22byftaj5eq3k7xoobrlf34ty