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The performance and scalability issues of multithreaded Java programs on multi-core systems are studied in this paper. First, the authors examine the performance scaling of benchmarks with various numbers of processor cores and application threads. Secondly, by correlating low-level hardware performance data to JVM threads and system components, the detail analyses of performance and scalability are presented, such as the hardware stall events and memory system latencies. Thirdly, the usages of memory resource are detailed to observe the potential bottlenecks. Finally, the JVM tuning techniques are proposed to alleviate the bottlenecks, and improve the performance and scalability. Several key findings are revealed through this study.
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