java performance profiling

The examples in this article Summarize Java performance optimization techniques. Share to everyone for your reference. The specific analysis is as follows: Here is a reference to some books, network resources sorted out, suitable for most Java applications In Java programs, most of the reason for

final applications, such as Java.lang.String, where the entire class is final. Specifying the final modifier for a class allows the class not to be inherited, and specifying the final modifier for a method allows the method not to be overridden. If a class is specified as final, all methods of the class are final. The Java compiler will look for opportunities to inline all final methods, and inline is important for improving the efficiency of

medium-sized website services, and occupy the siege team of more than 60% of the crowd. In the focus on large-scale portal sites, small and medium-sized web portal technology development and practical experience is worth sharing.Whether a large portal site or a small or medium-sized vertical type site will pursue stability, performance and scalability. The technical experience of large-scale web site sharing is worth learning and borrowing, but the i

final applications, such as java.lang.String, where the entire class is Final. Specifying the final modifier for a class allows the class not to be inherited, and specifying the final modifier for a method allows the method not to be Overridden. If a class is specified as final, all methods of the class are Final. The Java compiler will look for opportunities to inline all final methods, and inline is important for improving the efficiency of

Java is a great language. It manages memory and teaches Object-Oriented Programming (IDEAS) so that we can better use it for coding. In addition, it is indeed a language for "writing once and running everywhere. However, Java applications may encounter some common performance challenges that developers and applications are familiar. Memory leakage One of the

The Python programming language must be continuously used. Next we will take a detailed look at how we can better learn relevant knowledge. Recently I have been reading a wxPython-based GUI application code, which is about 45.5KLOC, and does not include the Library (such as Twisted) it uses ). The code is written by Java developers who are unfamiliar with Python, so it has serious performance problems (such

The popularity and wide application of Java, and its mechanism based on virtual machine operation, make the performance problem more and more important. This paper analyzes Java application design from the perspective of Java Virtual machine, especially the garbage collection mechanism, and concludes several principles

This book provides a detailed introduction to the fundamentals of Java virtual machines and the optimization of diagnostic methods. It focuses on the Java Virtual Machine architecture, common virtual machine parameters, Java Virtual Machine garbage collection principle, algorithm and the current virtual machine support of the various garbage collector and its dif

The author of this book is a leader in Java performance and Java HotSpot virtual machines, helping you to use modern soft practices to improve your practical life by summarizing energy, avoiding common mistakes, and tips and tricks.Using G1 to overcome the limitations of parallel, serial, and CMS garbage collectors learn about the various stages of G1 GC collecti

JSON, because it is easy to read and write, but also easy to machine parsing and generation, strong compatibility, has become the current server and Web applications between the accepted standard of data transfer. In this article we ran a benchmark test in the Java programming language to test a few common JSON libraries, and see how fast the library is when parsing files of different sizes. JSON is typically used to transmit and parse large files. Th

levels. Let's look at a simple example: a WEB service client connects to a server. First, there is a connection failure exception at the Java library level. Thereafter there will be a client failure exception at the framework level, and then there may be a failure exception for the business logic call at the application level. So far, a total of three strack traces have been collected. In most cases, you can see these strack Trace , while writing the

cases. But I don't think the analysis is all right here, but I feel that there is something else missing. Stack TraceI'm still curious about this, and I've monitored how the performance of the Strack trace was changed when I collected it. What happens most often is this: write down the exception and its stack track, and try to find out where the problem is. For this I modified the code and collected an extra strack trace of the exception. This makes

In the Java performance optimization series, memory management is a key factor of priority. When it comes to memory allocation, it will inevitably involve basic types and reference types. So today we will introduce the two types of their respective mysteries in terms of performance (for details about the other mysteries of the reference types, refer to "here ").

JvmThe correct use of the JVM parameter configuration parameters running in the Jee container is directly related to the performance and processing capability of the whole system, and the tuning of the JVM is mainly for the tuning of memory management, and the direction of optimization is divided into the following 4 points:The size of the 1.HeapSize heap, or the strategy for Java virtual machines to use me

Summary A multi-threaded program created by a developer sometimes generates an error value or produces other strange behaviors. Odd behavior occurs when a multi-threaded program does not use a synchronous serialization thread to access key code. What does synchronous serialization threads mean by accessing key code? This article explains synchronization, Java synchronization mechanism, and two problems that occur when developers do not use this mechan

memory recovery has a negative impact on the System's automatic memory recovery mechanism and will increase the processing time of the System's automatic recovery. Therefore, avoid explicitly using System. gc (),JVM settings can improve the system performance. For example:Java-XX: NewSize = 128 m-XX: MaxNewSize = 128 m-XX: Export vorratio = 8-Xms512m-Xmx512mFor details, refer to the java help documentation

In any system, the log is a very important part, it is a reflection of the system operation of the important basis, but also the necessary clues to troubleshoot problems. Most people recognize the importance of the log, but how many people think carefully about how to log, the impact of the log on the performance of how much? Let's talk about the performance of Java