By Mauricio Oliveira. Remarkable Java performance improvements are being seen on the latest IBM Power Systems featuring POWER7+ processors which have significantly bigger, 10MB L3 caches associated with each core. A Java workload called SPECjbb2005 has run-time characteristics which benefit greatly from that larger L3 cache. Comparisons of recent external publishes with the workload compared to earlier POWER7 based publishes show how well Java workloads like this can run on the newer POWER7+ systems.
A new article Java performance improvements seen on POWER7+
discusses the improvements seen, elucidating the benefits of the larger L3 cache and the higher clock frequency of the processors. It also covers a model of the processor's inner working, and how to collect and analyze data from its Performance Monitoring Unit.