garbage collection in java interview questions

Garbage collection Overview A user program (mutator) modifies the object set in the heap area, obtains space from the storage manager, creates an object, and introduces and removes references to existing objects. When mutator cannot "reach" some objects, these objects become garbage. Objective: To find inaccessible objects and hand them over to the storage manage

Memory management is an important factor that affects the performance of software applications. Allocating and unloading memory takes longer than the actual data calculation time. Although C + + can directly control memory allocation and release, Java uses garbage collection to reclaim memory that the program no longer needs, trying to master memory management.

Garbage collection optimization for high throughput and low latency Java applicationsHigh-performance applications form the backbone of modern networks. LinkedIn has many internal high-throughput services to meet user requests thousands of times per second. To optimize the user experience, it is important to respond to these requests with low latency.For example,

local method stack. 1.4. Java HeapThe largest chunk of memory, used to hold object instances and arrays, and areas where the garbage collector is primarily administered. The virtual machine is created when it is started, all threads are shared, but there is a thread-private allocation buffer. You can throw an exception outofmemoryerror (dynamic expansion cannot apply to enough memory). Cenozoic 1/3⎧⎩⎨⎪⎪ede

also use the-xx:maxgcpausemillis=n parameter to limit the pause time. GC ProcessHowever, the Parallel Collector (parallel GC) generally sets the-xx:maxgcpausemillis parameter, as the system can use the Concurrent Mark Sweep (CMS) if required for the pause time Collector.The Concurrent Mark Sweep collector (CMS GC): Its command is-XX:+USECONCMARKSWEEPGC. Its main goal is to shorten the pausetime. It is divided into two stages mark–sweep. So it has two pause times, but the time is short. GC Proce

This article consists ofimportnew - lomoxy translated from javapapers. Directory Introduction to Garbage collection How does garbage collection work? Categories of garbage collection

Compared to C + +, Java has the technical advantage of dynamically allocating memory and garbage collection mechanisms , so that we don't have to focus on memory management, so why do we need to know about GC and memory allocation? The reason is simple: when you need to troubleshoot various memory overflows, When a memory leak problem occurs, when

In the memory area of the Java Virtual machine, the program counter, the virtual machine stack, and the local method stack three areas are thread-private, generates with the thread, and out of line, with the stack frame in the stack and out of the stack as the method enters and exits, the amount of memory allocated per stack frame is basically known when the class structure is determined. As a result, memory allocation and recycling in these three reg

The principle of the garbage collection mechanism in AVA recommend an article: the memory management of High-performance Java code more than you write the code, the GC simply can not recycle, the direct system hangs off. GC is a program that is not intelligent, he only reclaims the rubbish he thinks of, instead of recycling what you think of rubbish. GC

In- depth understanding of the Java garbage collection mechanism----I. The significance of garbage collection mechanismA notable feature of the Java language is the introduction of a garbage