1. Introduction
Garbage Collection in Java is an automatic memory management process that removes unused objects from memory. The JVM provides different types of Garbage Collectors, each designed for specific use cases and performance requirements.
2. What is Garbage Collection in JVM
Garbage Collection is the process of identifying and removing objects that are no longer in use, freeing up memory and improving application efficiency.
Summary
Automatically manages memory.
Removes unused objects.
Prevents memory leaks.
3. Types of Garbage Collectors in JVM
3.1 Serial Garbage Collector
The Serial GC uses a single thread to perform all garbage collection tasks. It is suitable for small applications with low memory requirements.
Summary
Single threaded.
Simple and low overhead.
Best for small applications.
3.2 Parallel Garbage Collector Throughput Collector
The Parallel GC uses multiple threads to perform garbage collection, improving throughput and performance.
Summary
Multi threaded.
High throughput.
Used in applications where performance is important.
3.3 CMS Garbage Collector Concurrent Mark Sweep
CMS GC performs most of its work concurrently with the application, reducing pause times.
Summary
Low pause time.
Runs alongside application.
May cause fragmentation.
3.4 G1 Garbage Collector Garbage First
G1 GC divides heap into regions and prioritizes garbage collection in areas with the most garbage. It is designed for large applications.
Summary
Region based.
Low pause times.
Best for large heaps.
3.5 Z Garbage Collector ZGC
ZGC is a modern low latency garbage collector designed for very large applications. It minimizes pause times to a few milliseconds.
Summary
Ultra low latency.
Handles large heaps.
Highly scalable.
3.6 Shenandoah Garbage Collector
Shenandoah GC focuses on reducing pause times by performing most of its work concurrently with the application.
Summary
Low pause time.
Concurrent processing.
Improves responsiveness.
4. Comparison of Garbage Collectors
| Garbage Collector | Best For | Key Feature |
|---|---|---|
| Serial GC | Small apps | Single thread |
| Parallel GC | High throughput apps | Multi thread |
| CMS GC | Low latency apps | Concurrent execution |
| G1 GC | Large applications | Region based |
| ZGC | Very large apps | Ultra low pause |
| Shenandoah | Responsive apps | Concurrent GC |
5. How to Choose the Right GC
Use Serial GC for small applications.
Use Parallel GC for high throughput.
Use G1 GC for balanced performance.
Use ZGC or Shenandoah for low latency systems.
6. Common Mistakes to Avoid
Choosing wrong GC for application type.
Ignoring GC tuning.
Not monitoring memory usage.
7. Key Takeaways
JVM provides multiple Garbage Collectors.
Each GC has its own use case.
Choosing the right GC improves performance.
Modern GCs focus on low latency.
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9. FAQ Section
9.1 What is Garbage Collection in Java
Garbage Collection is the process of automatically removing unused objects from memory to free up space.
9.2 Which Garbage Collector is best in Java
G1 GC is commonly used as a default because it provides a good balance between performance and latency.
9.3 What is the difference between Serial and Parallel GC
Serial GC uses a single thread, while Parallel GC uses multiple threads for better performance.
9.4 What is low latency Garbage Collector
Low latency collectors like ZGC and Shenandoah minimize pause times to improve application responsiveness.
9.5 Can we change Garbage Collector in Java
Yes, you can choose different Garbage Collectors using JVM options based on application needs.
10. Conclusion
Understanding different Garbage Collectors in JVM helps you optimize memory management and application performance. By selecting the right GC, you can achieve better throughput and lower latency.
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