Introduction
In the previous chapter we have discussed the implementation of hotspot garbage collector, a total of six implementations of six combinations. This LZ together with you to discuss the six kinds of collectors of their respective power and the power of the combination.
In order to facilitate you to watch and contrast, LZ decided to use the original design pattern used in the way, for some collectors, divided into several dimensions to exp
"declaration"Welcome reprint, but please keep the original source of the article →_→Life One number: http://www.cnblogs.com/smyhvae/Article Source: http://www.cnblogs.com/smyhvae/p/4748313.htmlContact information: [Email protected]The main content of this article:
Review of the Heap
Serial collector
Parallel collector
CMS collector
0, He
Garbage collector
Garbage collector for hotspot virtual machines
There is no provision in the Java Virtual Machine specification for how the garbage collector can be implemented, so different versions of the virtual machine provide a large difference in the garbage collector, and will provide the paramet
stack.
-xx:survivorratio=4: Sets the ratio of the size of Eden and survivor in the younger generation. Set to 4, the ratio of two survivor to one Eden area is 2:4, and a survivor area represents 1/6 of the entire young generation.
-xx:maxpermsize=16m: Set the persistent generation size to 16m.
-xx:maxtenuringthreshold=0: sets the maximum age for garbage. If set to 0, then the young generation object does not go through the survivor area, directly into the old generation. For older g
Tag: New state Operation direct IMG Injection application delayOne, open collector output1, open collector output principleOpen Drain and open Collector are often encountered in the circuit of the two cases. The "drain" referred to in the concept of the open drain circuit refers to the drain of the MOSFET. Similarly, the "set" in the open
GC Algorithm Garbage Collector overviewGarbage collection Garbage Collection is often referred to as the "GC", which was born in the 1960 MIT Lisp language, and has matured for more than half a century.In the JVM, the program counter, virtual machine stack, and local method stack are all born with threads, and stack frames are loaded and out of the stack with the entry and exit of the method, and automatic memory cleanup is realized, so our memory gar
Serial CollectorSerial is a new generation collector; single-threaded garbage collector with a copy algorithm-xx:+useserialgc
Parnew CollectorParnew is a new generation collector; The Parnew collector is actually a multithreaded version of the serial collector, and the rem
This article consists ofimportnew - nice translator from Javapapers. Directory
Introduction to Garbage collection
How does garbage collection work?
Categories of garbage collection
Garbage collection Monitoring and analysis
In this tutorial we will learn several existing garbage collector. In Java, garbage collection is an automated process that can replace programmers in allocating and reclaiming memory for these complex tas
There are three garbage collection algorithms for the JVM: 1. Mark-Clear (Mark-sweep): Nothing to say, direct 2. Mark-Organize (mark-compact) 3. CopyGenerational Collection AlgorithmsThe current garbage collection isusing generational collection algorithmsIt also derived a lot of garbage collector "generational collection" (generational Collection) algorithm, the Java heap is divided into the new generation and the old age, so that according to the ch
In this section, let's summarize what the JVM garbage collector does. Garbage collectorDetermine if an object reference is invalidObject Survival Judgment algorithmReference judgment ProcessIntroduction to garbage collection algorithmsGarbage collectorNew Generation garbage collectorOld age garbage collectorNew generation and old age garbage collector garbage collectors determine whether object reference is
1.Serial CollectorThe advantage is simple and efficient, single threaded to avoid the overhead of thread interaction.Disadvantage, stop the world is required for garbage collection (all user threads are paused).2.ParNew CollectorIt is a multi-threaded version of the serial collector and is a multi-threaded parallel collection of the new generation. Is the default Cenozoic collector for the CMS
What is the Java garbage collector
The Java garbage collector is one of the three key modules of the Java Virtual Machine (JVM) (the other two are interpreters and multithreading mechanisms), providing automatic memory allocation (Memory allocation), automatic recycle (garbage Collect) capabilities for Applications, Both of these actions occur on the Java heap (a section of memory is fast). At one point, a
This article mainly introduces several garbage collectors of the JVM. As shown below, the above three are the new generation of collectors, the following three are the old collectors, wherein the G1 collector can be used for the new generation and the old age collection work.JVM garbage collector1,Serial (serial collector): For the generation of GC, replication algorithm, the default is client mode at start
Introduction
Garbage collection technology is not the Java language Initiative, the 1960 was born at MIT Lisp is the first real use of memory dynamic allocation and garbage collection technology language. Three issues to consider for garbage collection technology are:
1. Which memory needs to be recycled
2. When to recycle
3. How to Recycle
The distribution of Java Memory Runtime regions, where program counters, virtual machine stacks, and local method areas are all born with threads, and a
New generation collectors for hotspot virtual machines
There are seven main types of hotspot garbage collectors: As shown in the picture:The upper part of the figure is the new generation of garbage collectors, the following section represents the old age of the garbage collector, the two garbage collector between the line means that two collectors with the use. Serial
up directly.
Generational collection algorithm (generational Collection): According to the different life cycle of the object divides the memory into several blocks, generally divides the Java heap into the Cenozoic and the old age, then uses the most appropriate collection algorithm according to the characteristic of each age.
garbage collectorThe garbage collector is a specific implementation of memory reclamation. A hotspot vir
machines. The idea of active interruption is that when the interruption occurs, the virtual machine sets a flag on all threads, the thread checks the flag on its own, and then enters the "security point ". The inspection mark is located at the same place as the security point.3. Security zoneThe problem not solved above is that when a thread is in sleep or no CPU clock is allocated, such as sleep or blocked status, it cannot go to the security point to suspend itself. In this case, we
Java Virtual machine garbage collector and memory allocation policy overview
Those memory needs to be recycled, when to recycle, and how to recycle is the 3 things a GC needs to accomplish.
program counters, the virtual machine stack and the local method stack are all three areas of thread-private, memory allocation and recycling are deterministic, and memory is recycled as the method ends or the thread ends.
The Java heap and
collection (generational Collection) algorithm, which does not have any new ideas, but divides the memory into several blocks based on the different inventory cycles of the objects. In general, the Java heap is divided into the new generation and the old age, so that the characteristics of each era to adopt the most appropriate mobile phone algorithm. In the new generation, each garbage collection found that a large number of objects died, only a small number of survival, then the choice of rep
with the thread, and out of the thread, so that the memory allocation and recovery of these areas are deterministic, there is no need to too much consideration of the recycling problem, because the end of the method or the end of the thread, memory naturally with the recycling. The Java heap and method areas are different and different! (How not to say the catchy), this part of the memory allocation and recycling is dynamic, it is the garbage collector
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