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GCViewer is a tool to analyse gc logs generated by recent Sun / Oracle Java versions and some older IBM / HP UX / BEA Java versions as well. It displays the data in graphical form and calculates some metrics that help to understand the efficency of the currently used garbage collection algorithm and deduce tuning measures.

BTrace is a safe, dynamic tracing tool for the Java platform. BTrace can be used to dynamically trace a running Java program (similar to DTrace for OpenSolaris applications and OS). BTrace dynamically instruments the classes of the target application to inject tracing code ("bytecode tracing"). ... [More] Tracing code is expressed in Java programming language. There is also integration with DTrace for the OpenSolaris platform. [Less]

The goal of the GChisto project is to create a tool that can visualize, and provide summary statistics for, GC logs so that its user can get a good understanding of how the GC operated and how it affected the user's application(s).