performance profiling tools

Linux SAR command:SAR (System activity Reporter report) is one of the most comprehensive system performance analysis tools available on Linux, which can be used to report the activities of the systems in many ways, including: Read and write of files, usage of system calls, disk I/O, CPU efficiency, Memory usage, process activity, and IPC-related activities.[Root ~]$ Sar-interval > [-A] [-b] [-b] [-c] [-d] [

Use IE to access the tested site (my Ie11,edge browser is the same), navigate to the page you want to test the action on, or the previous page of the page being tested. Press F12 to bring up developer tools, other features I'm not going to introduce, switch directly to the Performance tab.Follow the prompts by pressing the shortcut key Ctrl+e or by clicking the Start button in the upper left corner for anal

Linux, a lot of fully display the system's current state of operation, load, I/O and other information tools to help administrators in real-time understanding of the system running dynamic, and troubleshooting.PS Command: Displays the status of the process and the snapshot mode.The process is divided into two categories: one is the process that the user initiates through the terminal, and the other is the process that is unrelated to the terminal, mos

There are a lot of performance tools on the Linux platform, a dazzling, long-term groping and experience finding the best thing to use is the proven, simple gadgets. Brendan D. Gregg, a system performance expert, updated his famous talk (Linux performance Tools) and slides o

Detailed explanation of PHP debugging and performance analysis tools Xdebug and php debugging xdebug During program development, the most commonly used debugging method is to print statements using echo, print_r (), var_dump (), and printf. The execution efficiency of PHP scripts, usually the script execution time. The efficiency of Database SQL is usually the database Query time, but this does not really l

Introduction to performance analysis and tuning tools There is always a time when you want to improve the efficiency of your program, to see which part takes longer to become a bottleneck, and to know the memory and CPU usage when the program runs. At this point you will need some way to perform performance analysis and tuning of the program. by Context Manager A

:"126.10.10.3:88". -V Displays the version number and exits. -K uses the KeepAlive feature of HTTP. -d does not show percentages. -S does not display estimates and warning messages. -Q does not show progress after more than 150 requests-L Accept Variable document lengths (for dynamic pages)-g filename Outputs the result information to a file in the gnuplot format. -e filename Outputs The result information to a file in CSV format. -r Specifies that the program is not exited when an error message

-expensive------most-expensive-date /time|cpuprocess|i/o process|memoryprocess10-0618:46:38|sshd:[ emailprotected]|bash51k1503b|mysqld 95.0M10-0618:46:39| |sshd:[emailprotected]491b532b|mysqld 95.0M10-0618:46:40| |sshd:[emailprotected]184b228b| mysqld 95.0m10-0618:46:41|dd19| dd73m72m|mysqld 95.0M10-0618:46:42|flush-8:00.5|bash 100m100m|mysqld95.0m10-06 18:46:43| |sshd:[emailprotected]191B244B|mysqld 95.0m10-0618:46:44| |sshd:[emailprotected]184B228B|mysqld 95.0m10-0618:46:45|sshd:[emailprotecte

Article Description: how to lose weight to the website? Illustrated front-end performance optimization guide. Improve the speed of the site has a huge impact on the success of the site, because the load speed of the site directly affects the user experience and search engine rankings. Browser Diet is a very good guide that lists the various techniques and tools for front-end

__ Created Temp ________________________________________________________ Disk Table 45.90k 0.1/s table 1.67M 2.2/s size:512.0m File 0.0/s __ Threads __ ___________________________________________________________ Running 3 of 9 Cached%hit:99.74 Created 0.0/S Slow 0 0/s __ aborted ______________________________________________________ _______ Clients 187 0.0/s connects 12.89k 0.0/s __ Bytes ________________________________________ _______________________ Sent 5.83G 7.5k/s Received 370.77M 479.7/s

2 conceptual things: buffer and cache. What is the main buffer? Should be the data to be processed, mainly to deal with the problem of speed mismatch between 2 systems. The cache, in general, should be the caching of the resulting data, such as loading some information from the DB for querying. Swap partition, is to use the hard disk to do a portion of the cache, if swap is very frequent, that is, memory is not enough! List Description: PID process ID, user users, PR priority, V

1. First we install the XHPROF:Yum Install Xhprof2. After installation, find xhprof configuration file xhprof.conf, usually in/ETC/PHP.D, add these 2 lines:Extension=xhprof.soxhprof.output_dir=3. If you want a graphics session, you need to install dot ( optional ):Yum Install Graphviz4. Reboot the server after installation:Service httpd Restart5. Use as long as the following file code is included:#在php的头部加上, you can set the recording frequency, such as record one of the xhprof_enable (xhprof_fla

: DNS Lookup: Time spent refreshing the DNS lookup. (You Need To Find Out IP address of site.com and this takes time) Blocking: Time the request spent waiting for an already established connection to become available for re-use. As was said in another answer it does not depend on your server-this is client's problem. Connecting: Time it took to establish a connection, including TCP handshakes/retries, DNS lookup, and time connecting to a proxy or negotiating a secure-Socket Layer (SSL).

Percona-toolkit usage tutorial-Performance Tools 1. pt-index-usage Function introduction: Read the plug-in statement from the log file and explain how they use the index. After the analysis is completed, a report about the index that has not been used for query is generated. Usage: Pt-index-usage [OPTION...] [FILE...] You can obtain the SQL directly from the slow query. The SQL format in the FILE must be th

of virtual processors%cpu: Total CPU usageCPU: The number of CPUs used by the process.Command: Commands nameWhen reporting tasks and all thread global statistics:PID: Process IDUsr-ms: The number of milliseconds that tasks and child threads use at the user level.System-ms: The number of milliseconds that tasks and child threads use at the system level.Guest-ms: The number of milliseconds that the task and child threads use in the virtual machine (running a Vsan processor).Command: Commands name

0.00 0.00 0.00 0.00^c Top$Toptop-00:15:40 up 21:56, 1 user, load average:31.09, 29.87, 29.92Tasks:871 Total, 1 running, 868 sleeping, 0 stopped, 2Zombie%CPU (s): 96.8 us, 0.4 sy, 0.0 ni, 2.7 ID, 0.1 wa, 0.0 hi, 0.0 si, 0.0Stkib Mem:25190241+total, 24921688 used, 22698073+free, 60448Bufferskib Swap:0 Total, 0 used, 0 free. 554208cached Mem PID USER PR NI VIRT RES SHR S%CPU%MEM time+COMMAND20248 Root 0 0.227t 0.012t 18748 S 3090 5.2 29,812:58Java4213 Root 0 2722544 64640 44232

Java virtual machine performance monitoring and troubleshooting tools, virtual machine troubleshooting 1. jdk command line tool 1) jps: Virtual Machine Process status Tool Jps [option] [hostid] Main parameters: 2) jstat: Virtual Machine statistics monitoring tool Jstat- Main parameters: For example, if the gc information of process 8675 is queried twice every 8675 ms, jstat-gc 1000 2 3) jinfo: Java conf

AB use Apache附带的压力测试工具ab，非常容易使用，并且完全可以摸你各种条件对Web服务器发起测试请求。ab可以直接在Web服务器本地发起测试请求，这对于需要了解服务器的处理性能至关重要，因为它不包括数据的网络传输时间以及用户PC本地的计算时间。。To perform 1000 connection, 20 times concurrent (parallel, simultaneous):Syntax: Ab-n 1000-c www.baidu.comProduce results. Here are a few points to note:§time taken for tests: how long does it take to execute a total. (Over 1000 times in total)§requests per second: The average number of connection per second that can be processed.WebbenchUp to 30,000 concurrent conne

1. QuestionsOutOfMemoryError: Insufficient memory;Memory leaksThread deadlockLock Competition (lock contention)Java consumes too much CPU2. Java Common Health ToolsJPS (Java Virtual Machine Process Status tool) monitors JVM process state informationUse format:JPS [Options] [HostID]-M: output parameters that pass in the Main method-L: Displays the fully qualified name of the main class or Jar-V: Displays the parameters specified for the JVM virtual machineJstack : View the thread stack informatio

. Vmid [Protocol:][//]lvmid[@hostname [:p Ort]/servername] Interval: Query interval Count: Number of times Option: Represents the virtual machine information to query mainly three classes of class load, garbage collection, run-time compilation state JSTAT-GC 2764 250 20 per 250ms query process 2764 garbage collection situation. Common options Jinfo Java configuration information Format: jinfo [option] pid The Windows platform has only the