"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
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
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
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
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
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
If the collection algorithm is the method of memory recycling, then the garbage collector is the specific implementation of memory recycling. There is no provision for how the garbage collector should be implemented in the Java Virtual Machine specification, so the garbage collectors provided by different vendors and versions of virtual machines can vary greatly, and typically provide parameters for users t
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
Garbage collector is the implementation of garbage collection algorithm. The garbage collectors provided by different virtual machines can be quite different, and we are using all the collectors contained in the Hotspot,hotspot virtual machineShows 7 collectors that act on different generations, and if there is a connection between the two collectors, that means they can be used with each other. The area in which the virtual machine is located indicat
small number of survival, then choose the replication algorithm, only need to pay a small number of surviving objects of the replication cost can be completed collection. In the old age, because of the high survival rate of the object and the lack of additional space to guarantee it, it must be recycled using the "mark-clean" or "mark-sweep" algorithm.Garbage collectorIf the collection algorithm is the method of memory recycling, the garbage collector
It's been 2014 years now, but for most developers there are two things that are still a mystery--java garbage collection and the opposite sex (the yards were laughed at again). Since I don't know much about the latter, I think I'll try to talk about the former, especially with the advent of Java8, where there have been significant changes and improvements, the most important of which is the removal of persistent generations (PermGen) and some exciting new optimizations (which are mentioned later
History of the Java garbage collectorFirst stage, Serial (serial) collectorBefore jdk1.3.1, the Java virtual machine could only use the serial collector. The serial collector is a single-threaded collector, but its "single-threaded" meaning does not merely mean that it uses only one CPU or one collection thread to complete garbage collection, and more importantly
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
A major feature of the Java language is the ability to automate garbage collection without the developer focusing too much on system resources, such as the release of memory resources. Automatic garbage collection Although greatly reduce the developer's worries, basically do not worry about garbage collection problem, attention is basically oh, because we also have a common oom.
Owning a garbage collector can be said to be a significant difference bet
objects died, only a small number of survival, then choose the replication algorithm, only need to pay a small number of surviving objects of the replication cost can be completed collection. In the old age, because of the high survival rate of the object and the lack of additional space to guarantee it, it must be recycled using the "mark-clean" or "mark-sweep" algorithm.garbage collectorIf the collection algorithm is the method of memory recycling, the garbage
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