isilon performance

I. Language performance optimization 1. Using the AB tool under Apache for performance testingTest: ab-n100-c100 https://www.baidu.com/(Request 100 times, concurrency is 100)Focus on two volumes:Requests per second (number of requests per second) and time per request (average response times)2. Try to use PHP built-in variables, constants, functions, Reason: PHP code needs to go through the Zend Engine to

MySQL Storage server S:I5,8G,SSD; CentOS 7 x64; Install graphical monitoring tools (the monitoring tools themselves also consume resources)Jetty Application Server A:I5,8G,SSD; CentOS 7 x64; Install graphical monitoring tools (the monitoring tools themselves also consume resources)LAN Internal testing machine T:I5,8G,SSDHow to obtain the limit performance parameters of S and a, and the limit performance par

Label:This paper mainly explains MySQL performance bottleneck analysis, performance indicators, performance index information collection tools and methods, analysis of the use of tuning tools.The article has not been completed, the following is an outline.Performance bottlenecks:SlowPerformance Index:Frequency of VisitsNumber of concurrent connectionsCache Hit Ra

Performance bottlenecks:Slow, write faster than read The main performance indicators:Frequency of visits,The number of concurrent connections,Cache Hit Ratio,Index use,Slow log opening and analysis,Query log, querying logThreads_cached: Whether the connection thread cache is turned onThread_cache_size: The size of the number of thread cachesQuery_cache_size: Query Cache SizeJoin_buffer_size:join Buffer Size

the time of the command installation.Check performancePhp-dvld.active =1–dvld.execute=0 test.phpVLD extension of the main two parameter list-dvld.active defaults to 0. Represents whether the PHP file that is running is active VLD hooks,-dvld.execute defaults to 1. Represents only the intermediate code, does not execute the generated intermediate code, can be set to 0, indicating that the intermediate generation code is not executedMore list of parameters can be BaiduAlso refer to: http://blog.c

() {returnsubsystemID;} InlineChar* Getappversion () {returnappversion;} InlineChar* Getcompanyid () {returnCompanyID;} InlineChar* Getclustername () {returnclustername;} InlinevoidSetserviceid (Char*v) {memset (serviceId,0, A); memcpy (Serviceid,v,strlen (v)); } InlinevoidSetsystemid (Char*v) {memset (SystemID,0,4); memcpy (Systemid,v,strlen (v)); } InlinevoidSetsubsystemid (Char*v) {memset (subsystemID,0,4); memcpy (Subsystemid,v,strlen (v)); } InlinevoidSetappversion (Char*v) {memse

is relatively large. This means that this node will have more blocks and more er will be generated when mapreduce is executed. However, if the CPU and other hardware are not improved, the performance of the current node will be dragged. Therefore, the increase of this node does not correspond to a linear increase in speed. But it will always be better than three nodes. In addition, by analyzing the working conditions of mapreduce nodes, the relations

The author has done some optimization work in the iOS development process, has some superficial understanding to the iOS performance optimization, has been wanting to own these experiences, summarizes briefly.As the first of the series, I intend to summarize some of the general principles of iOS optimization. Because I think whether the list smoothness optimization, startup time optimization or other aspects of optimization, there are some common prin

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

Original http://www.cnblogs.com/BoyceYang/archive/2013/06/15/3138142.html Read navigation 1. Overview 2.RulesLogic Database Design 3.EnableDesign with efficient Indexes 4.EnableEfficient Query Design 5.EnableLow performance analysis with technology 6. Summary 1. Overview This is the most effective way to optimize SQL server performance by finding areas that can significantly improve

Recently, I 've been struggling with how to analyze and tune performance, starting with hardware orCodeOr database. From the Operating System (CPUScheduling, memory management, process scheduling, DisksI/O), Network, protocol (HTTP,TCP/IP), Or from the applicationProgramCode, database optimization, and middleware configuration. Multiple MiddlewareWebMiddleware (Apache,IIS), Application Middleware (Tomcat,WebLogic,WebSphere) And so on. Even though the

Build high performanceASP. NETSite Chapter 5-Performance Tuning Overview (previous) During this time, the seriesArticleI reorganized it. The previous introduction to performance optimization was not very clear. It can be said that starting from this article, it is the beginning of a complete series. Links to articles: Build high performanceASP. NETSite Opening Build high performanceASP. NETO