GCViewer is a tool designed to visualize garbage collection (GC) logs generated by Java Virtual Machines (JVMs). It supports a wide range of JVMs, including Sun/Oracle, IBM, HP-UX, and BEA JRockit. GCViewer parses these logs and presents them in a graphical format, allowing for easy analysis of GC performance metrics like GC times, pause durations, and heap utilization. It builds upon the work of Hendrik Schreiber, aiming to improve support for modern garbage collectors like G1.
GCViewer distinguishes itself through its comprehensive support for various JVMs, including modern collectors like G1, and its detailed event parsing capabilities. The tool visualizes GC events in a user-friendly chart and provides detailed event information in a separate panel. The inclusion of safepoint analysis and data averaging contribute to a deeper understanding of GC performance. It offers a flexible and extensible approach to GC log analysis.
- JVM Support: Supports a broad range of JVMs including Oracle, IBM, HP-UX, and JRockit, with detailed parsing for various GC algorithms.
- Visualization: Presents GC events in an interactive chart with line graphs, rectangles, and areas for easy interpretation.
- Event Details: Provides detailed information about individual GC events, including duration, pause type, and related metrics.
- Pause Analysis: Analyzes and displays various types of pauses (Full GC, concurrent, stop-the-world) and their associated durations.
- Metrics & Statistics: Displays key GC metrics like median, 75th percentile, and standard deviation for deeper performance insights.
- Safepoint Analysis: Reports on application stopped time (safepoints) associated with GC events.
- Parser Output: Provides parser details and error reporting for log format issues.
GCViewer is an actively maintained project, with recent commits indicating ongoing development and improvements. The project has a significant number of stars and forks, pointing towards a community interest. The comprehensive documentation and wiki links suggest a good level of support and a solid foundation. Although it builds upon older code, it continues to evolve to address newer JVM features.
GCViewer is beneficial for Java developers and operations teams who need to monitor and analyze GC performance in their applications. It helps identify GC bottlenecks, optimize GC configurations, and troubleshoot performance issues. By providing insights into GC behavior, GCViewer helps ensure application stability and responsiveness, providing a valuable tool for understanding and managing Java application performance.