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Java record-70-HashSet source code profilingHashSet does not contain duplicate elements, which are supported by the hash table. Next I will start to analyze the source code of the HashSet: first, start with the constructor; private transient HashMap We will be surprised to find that the HashMap constructor of HashSet has constructed HashMap and directly uses
JavaPerformance analysis toolsProfiler provides two completely different methods for profiling applicationsProgram. By default, you can useJprofiler GuiFor application performance analysis. The jprofiler GUI provides a button for you to start and close records and displays all analysis data for you. If you do not want to use the jprofiler GUI profiling program, you can useJprofilerProvidedOffline profilingF
Java profiling toolJprofilerProvides 4 differentProfiling Mode, The three modes involvedJprofiler Gui. Therefore, you can view and analyze the data immediately. The fourth mode does not involve the jprofiler gui. It is an offline profiling mode. 1. Attach Mode For profiling Jav
Compared with static code analysis, profiling is a dynamic analysis method for studying program behavior by collecting information during program running. The purpose is to locate the part of the program that needs to be optimized to improve the program running speed or memory usage efficiency. The following three methods are used to collect information when a program is running: Event method: for
In the development process of Java program, it is unavoidable to encounter memory usage, performance bottleneck and so on. javaprofiler Tools Help developers locate these issues quickly and effectively, making them an important tool in the Java development process. At present, there are many kinds of JavaProfiler tools on the market, this article will briefly introduce several common tools, and compare them
survivor area. Then tidy up the two districts of survivor. Full GCOrganize the entire heap, including young, tenured and perm. The full GC is slower than the scavenge GC, so the full GC should be minimized as much as possible. The full GC may be caused by the following reasons: Dynamic changes in the domain allocation policy of the heap after the last GC System.GC () is displayed call Perm field is full Tenured was written full
, there is not enough memory space for its use, there is an out-of-memory; for example, an integer is applied, but a long can be stored to save it.memory leak memories leak, refers to the program after the application of memory, can not release the requested memory space, a memory leak damage may be ignored, but the memory leak accumulation of serious consequences, no matter how much memory, sooner or later will be occupied. In fact, it is not recycled after the memory space has been used. Other
https://laurent-leturgez.com/2017/12/22/profiling-java-application-with-systemtap/https://myaut.github.io/dtrace-stap-book/app/java.htmlI ' m not a JVM internals geek but I am sure there was a a-do the job without restarting the JVM, and I found some COO L Stuff with Systemtap.To does this, you has to install the packages on your Linux Distribution:systemtap and Systemtap-runtime-
Download and activation: http://download.csdn.net/detail/lone112/6734291 offline activation red Gate Software Co., Ltd. in the UK recently released ants performance Profiler 8 Beta, which supports profiling of Web requests, asynchronous code, and Windows store apps. This version also supports SharePoint 2013 and a new timeline, which allows developers to monitor not only the performance of the application,
In the process of developing Java programs, it is unavoidable to encounter problems such as memory usage, performance bottleneck and so on. The Java Profiler Tool helps developers locate these issues quickly and efficiently, making it an important tool in the Java development process. At present, there are a variety of Java
(HASHCODE), GC generational age, lock status flag, thread-held lock, biased thread ID, biased timestamp, and so on.the second part, "Type pointer " : A pointer to the metadata of its class that the virtual machine uses to determine which class the object is an instance of. (Array, the object header must also have a piece of data to record the length of the array, because the virtual machine can determine the size of the Java object through the metada
C ++ code coverage profiling with GCC/gcov Submitted by bobah on Wed, 01/27/2010-17:42 Http://www.bobah.net/d4d/tools/code-coverage-with-gcov The coverage analysis with GCC/gcov includes three following steps * Instrumented application build-libraries, executable (s), and profiling artifacts (*. gcno files) are create
Python's function mechanism is a very important part, many times with Python script, that is, a few functions to solve the problem, do not need to like Java to get a class or something. This book address: Http://www.jianshu.com/p/d00108741a18 1 Function Object PyfunctionobjectThe Pyfunctionobject object is defined as follows:typedef struct{Pyobject_head Pyobject *func_code;/ * A Code Object * /Pyob
("Fromrealsubject");}}publicclass proxysubjectextendssubject{privaterealsubjectrealsubject; The //proxy role internally references the real role @Override public voidrequest () {prerequest (); // Actions that are attached before a real-world role Operation if (Null==realsubject) { realsubject=newrealsUbject ();} Realsubject.request (); //true character completion postrequest (); //actions attached after a real-world role Operation } privatevoidprerequest () {system.out.println (" Prerequest
Original article: Http://www.infoq.com/cn/news/2011/08/jprofiler7 J-Technologies Co., Ltd. released jprofiler 7.0 some time ago. Jprofiler is a Java SE/EE profiling tool that features CPU analysis, memory analysis, thread analysis, and Vm telemetry. New Features of version 7.0 include: Analyze the built-in probes for JDBC, JMS, JNDI, Servlet, files, sockets, and processes. You can use the API to customi
The following is transferred from http://ifeve.com/anatomy-of-a-synchronizer/:Although many synchronizers (such as locks, semaphores, blocking queues, etc.) function differently, their internal design is very different. In other words, the underlying parts of their internals are identical (or similar). Understanding these basic components can help us greatly when designing Synchronizer. This is what this article is going to elaborate.Note: The content of this article is the Bjørn of the Universi
x264 Code Profiling NotesThe basic framework of x264 is still a hybrid coding framework based on predictive + transform, as shown, including: Intra- frame prediction , inter-frame prediction , transformation and quantization , entropy coding , filtering , etc.The following is a series of articles x264 code anatomy:"X264 Code
Python source code profiling note 1--python objects Work whole two years, with Python most, however for Python internal mechanism is not necessarily all clear, indulge in the simple logic of adding additions and deletions every day to write, really exhausting. Many things do not forget, such as C language, exactly, Python source code written in C, the an
Python source code profiling note 0--c Language Basics Review To analyze the Python source code, C language can not be based on a few, especially pointers and structures and other knowledge. This article first reviews the C Language Foundation, facilitates the subsequent code reading. 1 About elf FilesThe
the listThere are at least three ways to traverse after JDK1.5: ForEach, iterator, for loop.Package Bupt.xiaoye.charpter2.list;import Java.util.arraylist;import Java.util.iterator;import java.util.List; public class Testfor {public static void Testforeach (List list) {Object Temp;for (object t:list) temp = t;} public static void Testfor (List list) {Object temp;for (int i = 0; i The result of the operation is:As you can see, the direct for loop is the most efficient, followed by iterators and f
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