netflow collector

ObjectiveThe garbage collection algorithm has been described in more detail here, we will introduce the specific garbage collector in the JVM, in the virtual machine specification is not how to implement the garbage collector, so each manufacturer's garbage collector may be completely different, However, we are introducing the JDK1.7-based hotspot virtual machine

The garbage collector is a concrete implementation of the memory recovery algorithm. Shows 7 collectors that act on different generations, and if there is a connection between the two collectors, they can be used together.Below is a collection of 7, divided into two pieces, above the new generation collector, the following is the old age collector. If there is a

1. Serial Collector The serial collector is a single thread collector, but its "single-threaded" meaning does not simply mean that it uses only one CPU or a collection thread to do the garbage collection, and more importantly, when it does garbage collection, all the other worker threads must be paused until the collection is complete. Serial

Java heap is not the same as the method area, where memory allocations are uncertain, and only when the program is running can you know which objects are being created, and this part of the memory and recycling is dynamic, and the garbage collector is concerned about this part of memory.Memory allocation and recycling in the "static" area is clear, but how does the "dynamic" area determine which memory to recycle and which memory should not? As we al

Java heap memory is divided into two parts of the new generation and the old generation, the new generation mainly uses the replication and labeling-clearing garbage collection algorithm, the old generation mainly use tag-sorting garbage collection algorithm, so in Java virtual for the new generation and the old generation of different garbage collectors, JDK1.6 in sun The garbage collector for the hotspot virtual machine is as follows:If the two garb

Preface The garbage collection algorithm has been described in more detail here, we will introduce the specific garbage collector in the JVM, in the virtual machine specification is not how to implement the garbage collector, so each manufacturer's garbage collector may be completely different, However, we are introducing the JDK1.7-based hotspot virtual machine

The garbage collector is a special feature that distinguishes Java from other programming languages. It frees programmers from the heavy work of manually reclaiming memory space. In the Java Programmer certification exams of SUN, the garbage collector is mandatory and generally accounts for about 6% of the total score. But because SUN's Java Programming Language SL-275 curriculum standard textbooks, the con

1. PrefaceGarbage collector is the previous chapter of the garbage collection algorithm theoretical knowledge of the specific implementation of the different virtual machines provided by the garbage collector may be a great difference, and we must explain in advance that there is no best garbage collector, more than a universal

), weak references (Weak Reference), virtual references (Phantom Reference) These 4 kinds of references are under the Java.lang.ref package:　　Strong references (Final Reference)Refers to references that are common in program code, such as Object obj = new Object (), as long as a strong reference exists, and the garbage collector never reclaims the referenced object.strong references have the following three features:1. A strong reference can directly

Master three garbage algorithms, seven garbage collectors, and learn what garbage collection algorithms are used for each garbage collector, as well as knowledge points about SafePoint.garbage Collection Algorithm1. Tag-purge algorithm (mark-sweep)tags (such as the accessibility algorithm) are all objects that need to be recycled, and all tagged objects are reclaimed after the tag is marked.Disadvantage: The labeling and purging process is inefficient

efficiency is very high. According to the characteristics of the Cenozoic, there are few objects that still exist, but what to do if a survivor space cannot provide enough space for the surviving object to be stored. The answer is to go to the old age to rent a little memory for emergency In some extreme cases, the target survival rate may be 100%, when more memory needs to be requested from the old age One, serial collector Cenozoic collectors, usi

The garbage collector is a specific implementation of memory recycling, the Java virtual machine specification does not specify its implementation, different vendors, different versions of the virtual machine provides a large variety of garbage collectors. This article mainly introduces the garbage collector in the HotSpot virtual machine.Various garbage collectorsShows different garbage collectors, each of

, the garbage collector will never reclaim Objectobj = new Object (); The corresponding object such as Obj.equels (NewObject ()) can be obtained directly through the objective lens. And so the Obj object is a strong reference to the subsequent newobject, and only if the obj reference is released, the object will be released, which is also the encoding form we often use. 2, soft reference Must be referenced and reclaimed before memory overflows, and ca

This article is based on Zhou Zhiming's "in-depth understanding of Java virtual machines"If the collection algorithm is the method of memory recycling, 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 different vendors, different versions of the virtual machines, m

Read the Java Paper garbage collector type article, here to do a summary, the article part of the translation from the Java Paper GC collector, part of the summary of their own, the image from the network, which is only used to understand the expression.One, JVM GC garbage collector typeThe JVM's garbage collector is b

If the collection algorithm is the method of memory recycling, then the garbage collector is the specific implementation of memory recycling. In the Java Virtual Machine specification, how the object garbage collector should be implemented does not have any rules, so different vendors, different versions of the virtual machines provided by the collector may be qu

Serial collector: (Serial collector) This collector is a single-threaded collector, but its single-threaded meaning does not just mean that it uses only one CPU or a collection thread to do the garbage collection, but more importantly, when it does garbage collection, All of the other worker threads must be paused (Sto

http://blog.csdn.net/java2000_wl/article/details/8030172 Click on the Open link HotSpot JVM Collector There are 7 collectors, divided into two, the new generation of collectors, the following is the old age collector. If there is a connection between the two collectors, it means they can be used in combination.serial (serial GC) collectorThe serial collector is

Java 8 series Stream powerful tool Collector, streamcollector Stream series: The basic syntax of Stream in Java 8 series Java 8 series Stream powerful tool Collector Reconstruction and customization of Java 8 series collectors Universal reduce in Stream of Java 8 series Overview Previously we used collect (toList () to generate a list in the stream. In the actual development process, List is the data

Garbage collector:The main implementation of Java's garbage collection mechanism is the "garbage collector", but the garbage collector provided by each vendor's virtual machine is very different, and even the same virtual machine provides several separate garbage collectors for users to combine according to their different characteristics. Is the collector that t