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Monitor Non-Heap Memory in the Java Virtual Machine
- Non-heap memory in the Java Virtual Machine (JVM) is crucial for performance and stability, handling class metadata, compiled bytecode, and thread stacks.
- Monitoring non-heap memory is essential to prevent issues like Metaspace OutOfMemoryError and performance degradation from growing code caches.
- Creating a sample Java application can demonstrate non-heap memory usage through activities like loading custom class loaders and spawning threads.
- Tools like VisualVM help monitor non-heap memory areas like Metaspace, Code Cache, and thread stacks by providing insights into usage and performance metrics.
- Using VisualVM's MBeans plugin, deeper access to JVM internals like Metaspace and loaded classes can be gained for efficient monitoring.
- JConsole, another tool, offers graphical monitoring capabilities for observing heap and non-heap memory usage, CPU, threads, and class loading.
- jcmd, a command-line utility, enables inspecting memory usage and offers detailed statistics, including Metaspace and Code Cache metrics.
- Native Memory Tracking (NMT) with jcmd provides insights into non-heap memory usage categories like Metaspace and Code Cache.
- Additional tools like Java Mission Control (JMC) and Prometheus + Grafana can enhance JVM memory monitoring for performance optimization in distributed systems.
- Monitoring non-heap memory is vital for JVM performance optimization and application stability, ensuring efficient resource utilization.
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