The first thread is responsible for recovering the young area of the heap
When the second thread is running out of heap, the heap is traversed, and the size of the older area of the older area is equal to-xmx minus-xmn, and the value of-XMS cannot be set too large because the second thread is forced to run to degrade the performance of the JVM.
The JVM's garbage collection mechanism for detailed understanding and tuning
GC Overview for 1.JVM
A GC is a garbage collection mechanism that is used by the JVM to free memory that is consumed by objects that are no longer in use. The Java language does not require the JVM to have a GC, nor does it stipulate how the GC works. However, the common JVM has GC, and most GC uses a similar algorithm to manage memory and perform collection operations.
After fully understanding the garbage collection algorithm and the execution process, it can effectively optimize its performance. Some garbage collection is dedicated to special applications. For example, real-time applications are primarily designed to avoid garbage collection outages, while most OLTP applications focus on overall efficiency. With an understanding of the workload of the application and the garbage collection algorithms supported by the JVM, the garbage collector can be optimally configured.
The purpose of garbage collection is to clear objects that are no longer in use. The GC determines whether to collect the object by determining whether the object is referenced by the active object. The GC first determines whether the object is ready to be collected. Two common methods are reference counts and object reference traversal.
1.1. Reference counting
The reference count stores all references to a particular object, that is, when the application creates a reference and the reference goes out of scope, the JVM must increase or decrease the number of references appropriately. When the number of references to an object is 0
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P, upgrade the young area to the size of the older area in the older area, etc.