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Optimize your JVM using memory management and garbage collection
- The Java Virtual Machine (JVM) manages memory allocation, garbage collection, thread management, and JIT compilation.
- Performance tuning of the JVM can optimize configuration and behavior for improved performance, scalability, and reliability.
- Inadequately configured JVM may lead to high latency, out of memory errors, CPU spikes, slow response times, or crashes.
- Key techniques for performance tuning include memory management and garbage collection.
- Memory management involves flags like -Xmx (maximum heap size), -Xms (initial heap size), and -Xss (thread stack size).
- -Xmx sets the maximum heap memory allowed for JVM, preventing memory allocation errors.
- -Xms sets the initial heap memory allocated at JVM start to improve performance.
- -Xss determines the stack memory size for each thread in the JVM.
- Garbage Collection automatically removes unused objects to free up memory, aiding memory management and preventing leaks.
- GC process involves finding and reclaiming memory of unused objects, returning it for new object creation.
- Flags like -XX are used for garbage collection configuration in advanced JVM tuning.
- Java 8 uses -XX flags like +PrintGCDetails to configure GC behavior.
- From Java 9 onwards, -Xlog:gc* flags are used for similar GC tuning.
- Optimizing JVM through memory management and garbage collection enhances Java application performance, scalability, and reliability.
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