command performance hooks

0.00 0.25 0.00 29.25 0.00 1.53 1.53 0.00 0.93 0.00Dm-0 0.00 0.00 0.00 0.00 0.07 0.00 48.19 0.00 3.53 3.53 0.00 1.47 0.00Focus Point%util This column represents an IO waitDisk usage, how much time it takes to CPU, a portion of the CPU that is processed by the process, calculated. There is also a part of waiting for IO, waiting for disk to read and write.How much of this waiting time is%utilIf this wait time is bigger, the reading and writing follow the big. Prove that the disk read and write in

[Linux] performance monitoring command vmstat and linux Command vmstatI. Overview Monitoring is usually divided into machine monitoring and service monitoring. Machine Monitoring is the basic monitoring to obtain the current running status of the system. service monitoring is the main purpose and the most important monitoring, machine Monitoring also exists for b

, the string is constantly refreshed, which is the flow of data transfer process and data packets, focusing on the third and fourth columns that represents which ip+ port is connected to which ip+ Port . Ctrl + C exits the program.The tcpdump also has the- C and- w options,-c Specifies the number of catches, and-W saves the crawl results to the specified path [Email protected] ~]# tcpdump-nn-i ens33-c 10-w/home/ask/documentation/ Besides, there are [[email protected] ~]# t

nload Command (view network card traffic, with Sar-n DEV)(The system does not install this toolkit by default, yum install-y nload, install nload before installing epel-release)Use Nload to view network card information, you can see access to the network card information, press the Q key to exit.Monitoring IO Performance (disk)Installation: Sysstat package will be installed with Iostat (Iostat and SAR belon

added nDo not add nnTcpdump-nn-c 10-w 1.cap only catch 10 packets and save to 1.cap file, 1.cap is not cat'sIf you want to view 1.cap to use the commandTcpdump-r/tmp/1.capTshark needs to be installedRemember this command, check the network card capture specific information, you can clearly see what time there is what IP visited the site, access to the site of what linksTshark-n-T a-r http.request-t fields-e "Frame.time"-E "ip.src"-E "http.host"-E "Ht

]} 'LISTEN 3Established 3 Tcpdump Install Yum install-y tcpdumpGrab Bag tool: tcpdumpUsage: TCPDUMP-NNThe first n indicates the IP display, and if you do not add N, the host name will be displayed.Listening for specified NICTcpdump-nn-i eth0[Email protected] ~]# tcpdump-nn-i eth0Listening on the specified portListening to the web port[[email protected] ~]# TCPDUMP-NN Port 80Monitor NIC Eth0 Port 80[Email protected] ~]# tcpdump-nn-i eth0 Port 80Do not listen on port 22Tcpdump-nn-i E

busy. The number of concurrent connections to a website is how many clients are attached at the same time. Linux under Grab Bag Grab Bag Tool tcpdump There is no need to install this command: Yum install-y tcpdump Specify the NIC name Tcpdump-nn-i ENS33 After running the above command, there will be a dense string of strings, before pressing CTRL + C,

Tags: LinuxMonitoring IO PerformanceIostat View disk condition (requires installation of Sysstat package)You can run the command directlyiostatOr add a 1 to the back, which is the dynamic display.iostat 1Iostat and Iostat 1 show things, with the SAR can be manifested, but with the iostat-x will not be able to use the SAR reflectediostat -xIostat-x has a very important indicator,%util, that indicates how much time the disk consumes CPU time, waits for

I. System performance analysis (Top command)The top command is a common performance analysis tool under Linux that shows the resource usage of each process in real time, and refreshes the list of processes by default for 5 seconds, so it is similar to the Task manager for Windows.650) this.width=650; "src=" Http://my.c

The commands for performance monitoring analysis include the following:1, Vmstat2. Sar3, Iostat4. Top5. Free6, uptime7, Netstat8, PS9, Strace10, LsofCommand Description:The free command is the most common command for monitoring Linux memory usageSyntax format:free [options]Parameter description:-M: View content usage in m (default is KB)-B: View memory usage in b

10.6 Monitoring IO Performance[[emailprotected] ~]# iostat -xLinux 3.10.0-514.el7.x86_64 (aminglinux-001) 2018年01月22日 _x86_64_ (2 CPU)avg-cpu: %user %nice %system %iowait %steal %idle 4.87 0.00 8.42 14.51 0.00 72.20Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %utilsda 0.01 0.74 32.95 10.74 901.28 80.73 44.95 1.19

Tags: monitoring io performance FREE Command PS command View network status Linux under Grab BagMonitoring IO PerformanceIntroductionThe Iostat is primarily used to monitor the IO load on the system device, iostat the statistics from the start of the system startup when the first run, and then running Iostat displays statistics from the last time the

Daily monitoring and debugging of Linux system performance is a heavy task for the system and network administrators. Five years after working as a Linux system administrator in the IT field, I gradually realized how difficult IT is to monitor and keep the system up and running. For this reason, we have compiled the list of 18 most commonly used command line tools that will help every Linux/Unix system admi

For every system administrator or network administrator, it is very difficult to monitor and debug Linux system performance issues every day. I've had 5 years of experience working with Linux administrators and know how to monitor the system to keep it running properly. To do this, we have written 20 command-line system monitoring tools that are useful and most commonly used by Linux/unix system administrat

I. uptimeThe Uptime command displays how long the server has been running, how many login users there are, and the overall server performance evaluation (load average ). The load average value records the load of the last 1 minute, 5 minutes, and 15 minutes respectively. The load average is not a percentage, but the number of processes waiting for execution in the queue. If the process requires that the CPU

Transferred from: http://www.kuqin.com/shuoit/20140219/338066.htmlFor system and network administrators, it is a heavy task to monitor and debug the performance of Linux systems on a daily basis. After 5 years working as an administrator in the IT field as a Linux system, I gradually realized how difficult it was to monitor and keep the system up and running. For this reason, we have written a list of the 18 most commonly used

1. top-Linux System process monitoringThe top command is a performance monitor that can be used in many Linux/unix versions, and it is also a tool for monitoring system performance often used by Linux system administrators. The TOP command periodically displays all running and running and updates to the list, showing C

ArticleDirectory Linux R D practice performance monitoring tools Abstract:This article summarizes eight very practical Linux Command Line performance monitoring tools. These commands support all Linux systems and can be used not only to monitor the system, but also to identify the causes of performance