java performance tuning and optimization

problem.27. Consider using static methods,If you don't have to go to the outside of the object, make your method a static method. She will be called faster because she does not need a virtual function-oriented table. This colleague is also a good practice because she tells you how to distinguish the nature of the method, and calling this method does not change the state of the object.28. The use of intrinsic get,set methods should be avoided wherever possible.In Android programming, the invocat

I. Preface Index plays an important role in database performance. The advantages and disadvantages of index design directly affect the efficiency of DB execution. Therefore, when performing DB tuning, some of them will start to process the index. SQL server also provides a good tool for Database Engine Tuning Advisor and provides some advice on index creation and

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

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

generate a subclass of the target class, weaving the slices into subclasses. Enjoy meta mode: Reusing large objects saves memory and creates time. Unlike object pooling, the objects are different, each with its own meaning and purpose, while object pool objects are equivalent, such as connections in a database connection pool. Decorator Mode: Functional components and performance components can be separated and need to be combined. Design principles:

The previous post introduced the performance differences between basic and reference types (mainly because of different memory allocation methods ). Today, we will take a specific example to show you how the optimization works. ★RequirementsFirst, describe the requirement. For details, specify a String object and filter out other characters except numbers ('0'-'9. The time overhead should be as small as p

: Output JVM's process informationJSTAT:JVM Status Monitoring ToolJinfo: Configuration parameters for the applicationJstack: Thread SnapshotJMap: Reclaims the queue of objects, stack informationBtrace: Dynamic Tracking Tool Kenai.com/projects/btraceJconsole: Graphical ToolsMAT: Graphical Heap analysis toolVisualVM: All-round composite toolsLinux log analysis often uses commands:View file contents: CatPaging Display file: more,lessShow file head and tail: tailContent Sort: SortCharacter Statistic

operation is serialized.3) Reduce the reliance on shared resourcesShared resources are the source of competition lock, in the multi-threaded development to minimize the reliance on shared resources, such as Object pool technology should be considered carefully, the new JVM to create new objects to do enough optimization, performance is very good, if the use of object pool not only can not improve the

server in the configuration and processing capacity is not inferior, but the probability of machine failure is higher than minicomputer. The way to solve this problem is to "win the volume", the data and applications deployed on multiple PC servers, the PC server is the master, even if one of the problems, there are other machines responsible for providing services, the problem of the machine's data and applications will soon be migrated to other machines , and then provide the service. The mat

The performance tuning of Enterprise Java applications is a daunting, sometimes futile task, caused by the complexity of modern applications and the lack of formal tuning methods. Modern enterprise applications are quite different from those applied ten years ago, and these applications now support multiple inputs, mul

We often see some Java performance-optimized books or concepts that do not define variables within a loop, which can take up too much memory-impacting performance and be defined outside the loop. Having been in touch with Java for so long, it is believed that many Java progr

Complete the same function, with different code to achieve, there may be a large difference in performance, so for some performance-sensitive modules, it is necessary to optimize the code. Today, let's talk about Java code optimization, and today we're going to focus on optimizations for the for (while and so on) loops

with a graphical performance detection tool. Ability to monitor memory, threads, class loading, virtual machine information, and moreVisual VM is a multi-in-one graphical performance detection tool that integrates a variety of new capability detection tools. Can replace some of the JDK's own tools, if JSTATE,JPS, etc.The Mat full name Memory Analyzer is a powerful Java