java performance tuning tips

-party applications running on Linux, there are many performance tuning techniques that can help you improve the performance of your Linux servers and lower your operating costs.14. Correct configuration of MySQLTo allocate more memory to MySQL, you can set the MySQL cache size, and if the MySQL server instance uses more memory, reduce the cache size and increase

Was configuration overview Describes parameter default setting principles JVM Stack Server > Application Server > Server1 >java virtual machine has no minimum value of total memory 1/8, the maximum is total memory 1/2 to 3/4 connection pool resource > JDBC Provider > (jdb C provider Name) > Data source > (data source name) > Connection Pool Properties Minimum connection number: 10 Maximum number of connections: 50 TPV Monitoring connection Pool size c

Directbytebuffer object stored in the Java heap, which can significantly improve performance in some situations because it avoids replicating data back and forth in the Java heap and the native heap. The allocation of native direct memory is not limited by the size of the Java heap, but since memory is certainly limit

the "CPU" button to start a CPU profiling session, VisualVM will detect all applicationsThe method that is called. When entering a method, the thread issues a "method entry" event when exiting the methodA "Method Exit" event is also issued, and these events contain timestamps. Then VisualVM will put eachThe total execution time and number of invocations of the called method are displayed according to the run-time length.In addition, we can filter the analysis results by the method name filter b

PrefaceA project in the development, testing, on-line, then the size of the user is still relatively small, so just on-line projects are generally stable performance. However, with the passage of time, the increase in the number of users, the increase in QPS and other factors will cause the project slowly show a half-day unresponsive situation. In the previous work also happened to encounter this process, at that time, the project carried out a lot of

This article transferred from: http://www.cnblogs.com/chen77716/archive/2010/06/26/2130807.htmlRecent memory leaks due to the project, so large-scale JVM performance tuning, now the experience to do a record.First, JVM memory model and garbage collection algorithm1. According to the Java Virtual Machine specification, the JVM divides the memory into: New

indicates how many new connection requests are allowed to wait in the queue when all threads are used to process requests. When the queue is full, any new request will be rejected. The default value is 100.The configuration example is as follows: Maxthreads is the maximum number of threads started by Tomcat. The default value is 200. acceptcount is the number of requests queued when the number of threads started by Tomcat reaches the maximum. The default value is 100, the two values work toget

operations, SQL operations, list refreshes, etc.) consume resources using the background process to implement, can not occupy the UI thread, the UI thread is the main thread, the main thread is the key to keep the program smooth, should only operate those core UI operations, such as processing view properties and drawing; Minimize the wake-up mechanism. We often use broadcasts to receive messages and events that are expected to respond, but too much of the response exceeds our own requireme

In addition to the integrated VISUALVM and Jconsole, the JDK itself provides performance tuning monitoring tools such as JPS, Jstack, Jmap, Jhat, and Jstat.In Java development, we sometimes encounter the following problems:OutOfMemoryError, Low memoryMemory leaksThread deadlockLock contention (lock contention)The Java

Source Address: https://msandbu.wordpress.com/2014/10/31/netscaler-and-real-performance-tuning/The author is obviously not a native English speaker, so some places I look at is also more laborious, but very grateful to the original author.========= translated content started =========Yesterday I had a meeting with Citrix User group in Norway on NetScaler and performance