java performance testing

Original: Java vs. io and NiO file read/write performance testSource code: Http://www.zuidaima.com/share/1550463508466688.htm1. NIO uses a way closer to the operating system to execute IO: Channels and buffers, as the name implies, data source data is transmitted by the buffer through the channel. 2. After JDK5, the raw IO system was optimized for NIO at the bottom, which can be found through Sun's publishe

Java 1.5 and above are built in virtual machinesProgramPerformance tracking function, and provides Java profiling API, JPA for short, you can search for 'javaProfiling '. Java also provides a simple performance tracking tool jconsole, which can display the memory, threads, and other usage conditions. Also provided by S

Recreate the classic, uncover the face of the pseudo-tall, easy to handle jvm!1. JVM base (selection, memory model, GC, etc.)2. JVM Key Parameters3. JVM monitoring (commands, tools)4. Typical JVM performance issues (CPU, memory leak, thread lock, etc.)Address: http://edu.51cto.com/course/course_id-4868.htmlPS: with Tomcat video betterAddress: http://edu.51cto.com/course/course_id-4166.html"Video" Java JVM

. If the application you are publishing is not a relative directory, but a war package, then you need to read the following chapters below. If it is ear (EJBs), then you need to read some of the following User Guide advanced content. 1 jar Package There are two jar packages in Javamelody.zip, one is Javamelody.jar and the other is Jrobin-x.jar. Copy the two jar packages to the Web-inf/lib directory in the webapp corresponding to the war package. Or use Maven to add Javamelody-core dependent f

The SDK provides several java. util. List Implementation interfaces for Ordered Sets. Three of them are most well-known: Vector, ArrayList, and sorted List. The performance difference between these List classes is a frequently asked question. In this article, I want to discuss the performance differences between Vector list and Vector/ArrayList.To fully analyze t

1. NIO uses a way closer to the operating system to execute IO: Channels and buffers, as the name implies, data source data is transmitted by the buffer through the channel. 2. After JDK5, the raw IO system was optimized for NIO at the bottom, which can be found through Sun's published source code, but NIO is more systematic than IO. 3. In a little study of IO source code and some sun source code, I think the performance bottleneck of IO system is mai

randomness into the retry mechanismThe 11th chapter performance and can extend the straight-temperedPerformance metrics: Speed of operation, processing powerHow to evaluate? How to weigh?Amdahl LawCost of thread Ingestion: Context switch, memory synchronization,Modern JVMs can automatically optimize lock and memory reorderingReduce lock contention: Reduce lock hold time, reduce lock request frequency, use exclusive lock with protocol mechanism1. Fast

The test is mainly from the running time difference, the larger the amount of data, the more obvious the time difference, examples are as follows:1 Package com.xt.thinks21_2;2 3 /**4 * Synchronous lock Performance Test5 * 6 * @author Administrator7 *8 */9 Public classSynchronizedtimetest {Ten Public volatile intinc =0; One A Public voidIncrease () { -Inc++; - } the - Public Static voidMain (string[] args) { -Final Synchronized

When interviewing testers, This is a good question: How do you define performance/load/stress testing? In many cases, people use them as the same terminologies that can be replaced by each other. However, the differences between them are quite large. This post is based on some of my own experiences. I wrote a simple comment on these three concepts. Of course, I also referred to some definitions in the test

Performance testing-business testing model and performance testing model Performance testing-business testing model description With the dev

interface function while encapsulating some of the application logic. Server-side database servers primarily provide data storage capabilities, and also provide partial application logic through triggers and stored procedures. C/S/S structure is the client/application server/Database server three-tier structure, the middle of the addition of application server, usually implement the application logic, is the connection between the client and the database server bridge. It responds to requests f

　 Performance Testing(Or multi-user concurrent performance testing ), Load Testing, Strength Test, Capacity TestIt is a few aspects of performance testing, but the concept is easy to co

Java EE Technology system in the performance of the need to take care of, the general principle is less than 3 seconds to accept, 3-5 seconds can be accepted, more than 5 seconds on the impact of ease of use. If you find a performance problem during testing, it's hard to fix it because it often means that the algorith