gc games

First of all, I would like to thank Alibaba Cloud for helping me understand the adjustment of this GC algorithm, rather than staying at the stage of understanding. After reading Sun's document and discussing it with Apsara, let's make a small summary. If there are any mistakes, please correct me.CMS, full name concurrent low pause collector, is a new GC algorithm introduced in later versions of jdk1.4, whic

Collector speciesThere are four types of GC in HotSpot VM 5.0:incremental (sometimes called train) low pause collector has been deprecated, not introduced. Category Serial collector Parallel collector( throughput collector ) Concurrent Collector(Concurrent low Pause collector) Introduced Single Thread CollectorUsing a single thread to do all the GC work, witho

There are a number of algorithms for GC (garbage Collection) in the JVM, such as the tag purge collector, the compression collector, the generational collector, and more, see the types of hotspot VM GCNow more commonly used is generational collection (generational collection, also used by Sun VMs, introduced after j2se1.2), which will divide the memory into several regions, placing objects of different life cycles in different regions: youngGeneration

Transferred from: http://jeromecen1021.blog.163.com/blog/static/18851527120117274624888/Interview Topics:The people of the Earth know that Java has a thing called the garbage collector, it makes the object created does not need to be like c/cpp, delete, free, can you talk about when the GC is, to what, what things?A. Answer: When? 1. When the system is idle.Analysis: This answer accounts for about 30%, in general I will be ready to turn

Why you should know about GCWe all know that Java developers do not need to be concerned about the recycling of objects in the development process, because the Java virtual machine causes it to automatically reclaim the failed garbage objects. So why do we have to learn about GC and memory allocation?The answer is simple: when we need to troubleshoot various memory overflows, memory leaks, and when the garbage collector becomes a bottleneck for the sy

The JPS (Java Virtual machine process Status Tool) is a command that JDK 1.5 provides to show all current Java process PID, and is simple and practical, ideal for linux/ Simple view of the current Java process on the UNIX platform.JPS stored in the JAVA_HOME/BIN/JPS, when used for convenience please add java_home/bin/to path.Jstat1. JSTAT-GC PIDYou can display GC information, the number of times the

Transferred from: http://blog.csdn.net/heyutao007/article/details/381515811. JVM Memory Composition StructureThe JVM memory structure consists of heap, stack, local method stack, method area and so on, and the structure diagram is as follows:1) HeapAll the memory of objects created by new is allocated in the heap, and its size can be controlled by-XMX and-XMS. The heap is divided into the Cenozoic and the old generation, and the Cenozoic is further divided into the Eden and survivor areas, the s

() function . Circular References is the main culprit that caused the memory leak. However, circular references between objects without the __del__ () function can be reclaimed by the garbage collector. How do I know if an object is leaking out of memory?You can view the details of objects that cannot be reclaimed by using the Python extension GC. CasesExample 1: A memory leak is not presentImport gcimport sysclassCgcleak (Object): def __init__ (self

Description: In this paper, Garbage Collection is translated as "garbage collection", garbage collector translated as "garbage collector"; It is generally recognized that garbage collection and garbage collecting are synonyms. Minor GC translates as: small GC; Rather than a secondary GC Major GC translates as: large

One of the online development of ghost-hunting games, the development of ghost-hunting games Friends who have seen a well-known mango TV program should be "who is undercover" will not be unfamiliar: N people involved, N-1 people get the same word (such as steamed buns ), when one person gets another word (such as Steamed Stuffed Bun), N people can only see their own words, so no one knows whether they are d

Combination games and element combination games Before introducing SG functions and SG theorem, let's first introduce the verbs and verbs.The concept of "yes" and "yes": "Yes". In other words, if both parties operate correctly, they will be defeated. N: Yes. In this case, if both parties operate correctly, yes. Vertices and vertices: 1. All endpoints are vertices P. (We use this as the basic premise for rea

A: A brief introduction to the Java Memory Area 1. HeapThe memory initially allocated by the JVM is specified by-XMS, which defaults to 1/64 of the physical memory.The maximum allocated memory for the JVM is specified by-XMX, which defaults to 1/4 of the physical memory.When the default free heap memory is less than 40%, the JVM increases the heap until the maximum limit of-xmx, which can be specified by the-xx:minheapfreeratio= parameter.When the default free heap memory is less than 70%, the J

Interview Topics:The people of the Earth know that Java has a thing called the garbage collector, it lets the object created do not need to be like c/cpp, delete, free off, you can talk about:When was the GC, and what did it do to something?The above is considered as three questions, the following one analysis:question one answer : When?1. When the system is idle.Analysis: This answer accounts for about 30%, in general I will be ready to turn to other

. Net GC misunderstanding I recently interviewed some people and found that there are errors in the. NET GC (garbage collection) comprehension. GC is actually a very complex system. Although we don't need to consider it in 95% cases, we still have to deal with the GC system in 5% cases to solve the problem. For exampl

the purpose of garbage collection is to clear objects that are no longer in use. GC determines whether to collect the object by determining whether the object is referenced by the active object. Two common methods are reference count and Object Reference traversal. (1) reference count: The reference count stores the number of all references to a specific object, that is, when the Program is used to create a reference, the JVM must increase or decre

Recently, I have studied Clr and GC. On the msdn blog, I saw a female technician from the ms clr testing team raise more than a dozen questions. I think the questions are quite interesting and difficult, then modify it, delete a few and add a few more, and solicit a wide range of answers ^_^ 1. if a managed process runs on a dual-core CPU machine, GC runs in server

Very early on to Java GC do a little summary, has not time, recently read the Java paper on the Java GC article, feel good, read read, by the way to summarize.Java paper GC article address, there are a lot of Java technical articles, written well.1. Introduction to Java GCThe JVM's garbage collection mechanism frees developers from taking too much account of memo

Managed heap memory management policy and garbage collection The managed heap stores the objects in sequence, and carries out memory sorting after garbage collection. Therefore, if GC occurs frequently, the system performance will be reduced because GC cleans up the memory, causing the object to move in the memory, applications on CLR before GC endsProgramIt is

Jstat1. JSTAT-GC PIDYou can display GC information, the number of times the GC is viewed, and the time.The last five items were the number of young GC, the time of young GC, the number of full GC, the time of full

VisualVM is a free, integrated visualization tool with multiple JDK command-line tools that provides you with powerful analytics and performance analysis and tuning of your Java applications. These features include generating and analyzing massive amounts of data, tracking memory leaks, monitoring the garbage collector, performing memory and CPU analysis, and it also supports browsing and manipulation on MBeans.In memory analysis, the biggest benefit of Java VISUALVM is that you can analyze