p71 performance

Note: This article is the third of our series of PHP performance analysis, click here to read PHP performance analysis first: Xhprof Xhgui Introduction, or PHP performance analysis second: In-depth study of Xhgui.In the first chapter of this series, we introduced Xhprof. In the second chapter, we studied the Xhgui UI, and now the last one, let's use Xhprof/xhgui

Performance counters (counter) are some data metrics that describe the performance of a server or operating system. Counter plays a key role in performance testing, especially in analyzing the scalability of the system and locating the performance bottleneck, the analysis of the counter value is very important. However

Tags: io standby log file switch completion lgwr-lns wait on channel1. Recently processed one due to poor performance of standby disk IO, the performance of primary was affected.The main library is mostly waiting for "log file switch Completion", which, through ash dump analysis, finally discovers that the actual wait event is "Lgwr-lns wait on channel". This event basically boils down to the problem of net

A recent project tuning found that using a third-party JSON library resulted in poor performance. I thought the problem was so fixed, and the result was that the performance was not improved after the JSON operation was removed.The phenomenon is very strange: CPU, Memory, network, disk utilization are surplus, and the pressure is enough. Even with greater pressure, throughput does not improve.Then we monito

JQuery performance optimization and jquery Performance Optimization I. Proper Selector The JQuery selector provides rich selectors to locate DOM elements, Basic Selector # Id,. class, element, *, etc. Which of them is more efficient? First Choice: $ ("# Id ") Second choice: $ ("P"), $ ("div ") Third choice (optional ): $ (". Class ") Fourth choice $ ("[Attribute = value"]) Fifth choice (pseudo selector, whi

How to Improve jQuery performance and jQuery Performance Cache variableDOM traversal is expensive, so we try to cache elements that will be reused. Avoid global variablesJQuery is the same as javascript. In general, it is best to ensure that your variables are within the function scope.Copy code Using the Hungarian naming methodAdd a $ prefix to the variable to identify the jQuery object. Use Var chain (sin

Chapter 8 high-performance Server programming in Linux (high-performance server program framework)8. High-performance server program frameworkThe server is reconstructed into three main modules:IO processing unit. Four IO models and two efficient event processing modes.Logical unit. Two Efficient concurrency modes.Storage unit. (Not discussed for the moment)IO mo

Mongodb3.0 Performance Test Report 1: mongodb3.0 performance test Test environment: Servers: 6 X86 pcservers Cpu: single 8-core Memory: 64 GB Disk: raid 10 Operating System: centos 6.5 Mongodb: 3.0 Java DRIVER: 2.8.0 Jdk: 1.6 Network: Gigabit Ethernet Test 1: A single monodb service, with the same configuration server serving as a stress server, cannot exceed the memory size. The mongodb configuration is a

[Android performance optimization series] layout: dynamic loading layout and android Performance Optimization If you like my blog, please pay attention to my Weibo, please click here (http://weibo.com/kifile), thank you Reprinted please indicate the source (http://blog.csdn.net/kifile), thank you again Address: http://developer.android.com/training/improving-layouts/loading-ondemand.html In the next perio

[The copyright of this article is owned by the xiaotie@vip.sina.com, reproduced by the author's consent.] Problems ...... Performance tests show that the performance of the current architecture is relatively low. Test environment: pc cpu inter pentiumiii clock speed 797 MHzPrimary memory: 384 MbOperating System: Windows Server 2003Web server: iis6.0GIS server: geoserver The current Web GIS solution is

Frequent Dom operations are very performance-consuming. However, in rich web applications, we have to write scripts to deal with Dom. How can we optimize this performance bottleneck, consider the following three situations: Access and modify DOM elements Modifying the DOM style will cause page re-painting and re-layout. Respond to users through DOM Event Handler 　　Access and modify DOM elements In brow

Reasonable Use of operator priority, performance optimization and improvement details, and operator performance optimization In JAVA programs, most of the reason for performance problems is not the JAVA language, but the program itself. Developing good coding habits is very important and can significantly improve program per