linux sar logs

Today when reading the "large-scale Web services Development Technology" book, the book mentions the SAR command, it feels very useful, it is necessary to sort out the study. (For a Linux beginner, do not miss a learning opportunity: P)Opening your own centos, typing "SAR", expressed disappointment:[[email protected] ~]# SARBash:sar:command not foundThere is no i

Tags: SAR command detailedSAR (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. In this paper, the CentOS 6.3 x64 system i

do not need to be followed. If one day you manage the server drops is very serious, then you should look at this network card traffic is abnormal, if rxpck/s that column value is greater than 4000, or rxbyt/s that column greater than 5,000,000 is likely to be attacked, The normal server NIC traffic will not be higher than this, unless you are copying the data yourself.2) Real-time view of network card traffic# sar -n DEV 2 5

Metrics to measure CPU performance:1, the user uses the CPU situation;CPU runs regular user processesCPU Running niced ProcessCPU running real-time process2, the system uses CPU condition;For I/O Management: interrupts and drivesFor memory management: page swappingUser Process Management: Process start and context switch3,wio: The rate at which the process waits for disk I/O and the CPU is idle.4,CPU idle time, except for the above Wio5,cpu ratio used for context switching6,nice7,real-time8, the

Tuning system performance using SAR in LinuxKeywords: SARThe SAR default is not installed under Linux, we need to install manually, it is generally recommended source mode installation, download similar sysstat-6.1.3.tar.gzYou can then use the Configure make make install.Common formats for the SAR command line:SAR [Opt

SAR command Function descriptionThe SAR command can monitor multiple active parameters of the system.Centos7, due to the use of minimal installation, the default is not with this command, the following is the installation command demo: [Email protected] app]# SAR #提示没有找到命令-bash:sar: Command not found[Email protected] ~]# Yum provides */

2193348 26.7017:18 14 sec328708 1593664 82.90 35716 254300 2193348 26.70Average Time:328708 1593664 82.90 35713 254299 2193348 26.70Kbmemfree: This value is basically the same as the free value in the command, so it does not include buffer and cache space.Kbmemused: This value is basically the same as the used value in the free command, so it includes buffer and cache space.%memused: Physical memory usage, this value is a percentage of kbmemused and t

1. Conclusion:The SAR command is a common tool for analyzing system performance on Linux systems, and can be used to view CPU, memory, disk IO, file read and write, system calls,2, the SAR will have a scheduled task, regularly record the current system information to/VAR/LOG/SA/XX, the default is to record every 10 minutes, when the

Tags: Linux daily operation and maintenance management skillsw command: View system loadWLoad average the number of active processes that use CPU activity during the unit timeTo view the number of system CPUs (logical CPUs)Cat/proc/cpuinfo(When our process does not exceed the number of logical CPUs in our system per unit of time, it is the optimal state,When our process is larger than the CPU, be aware of what is taking up our CPU.Vmstat Command (moni

Use of Linux sar commands 1. Common sar command line formats: sar [options] [-A] [-o file] t [n] in the command line, the n and t parameters are combined to define the sampling interval and number of times. t indicates the sampling interval, which is a required parameter. n indicates the number of samples and is option

Tags: list load x64 form CEE share useful commonly used LinSAR (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. In this paper, the CentOS 7 x64 system is introduced a

used for dynamic monitoring processes change every 3 seconds.RES: This is the amount of memory that the process occupies,%MEM: Percentage of memory to use. In the top state, press SHIFT + M to sort by memory usage size.Press the number ' 1 ' to list the usage status of each CPU.TOP-BN1: Represents non-dynamic printing system resource usage, which can be used in shell scriptsTOP-C: Can display more detailed informationRT: Real-time priorityIv. SAR Com

a powerful tool for viewing network port traffic in Linux--SARThere is a small tool that allows you to view IP packet traffic statistics for each network port. With the SAR command, plus the-n dev parameter, you can count the traffic on all network cards, in the fifth and sixth columns shown, the data traffic received and the data sent, in units of kb/s, that is, the number of kilobytes per second. The foll

The SAR (System Activity Reporter report) is one of the most comprehensive systems performance analysis tools available on Linux and can be used to report on the activities of the system in several ways, including: Read and write of files, usage of system calls, disk I/O, CPU efficiency , memory usage, activities, and IPC-related activities. The following mainly takes Redhat system as an example to introduc

queue.%UTIL:I/O requests account for the percentage of the CPU, the higher the ratio, the more saturated the description.1. When the value of Avgqu-sz is low, the equipment utilization is higher.2. When the value of%util is close to 1%, it indicates that the device bandwidth is already fullTo determine the system bottleneck, it is sometimes necessary to combine several SAR command options.Suspected CPU bottlenecks,

SAR (System activity Reporter) is one of the most comprehensive system performance analysis tools on Linux, which can report the activity of the system from many aspects, including: Read and write of files, usage of system calls, disk I/O,CPU efficiency, memory usage, process activity, and IPC-related activities. In this paper , the CentOS 6.3 x64 system is introduced as an example to introduce the

8.66 25.11 1.4111:08:13 wd-0 0.77 2.78 2.77 7.26 4.94 2.7711:08:43 wd-0 1.10 11.18 4.　　　11.26 27.32 2.6811:09:13 wd-0 1.97 21.78 5.86 34.06 69.66 3.35Average wd-0 1.15 12.11 4.09 15.19 31.12 2.80 Display content includes:The Device:sar command is monitoring the name of the block device.%busy: The percentage of time that the transfer request takes up when the device is busy.Avque: The average number of requests not completed when the queue is full.R+W/S: The amount of data transmitted to or fr

Introduction to using Sar under Linux SubmitMy message Load inhave left a messageIntroductionThe Sar was first implemented in the Salaris UNIX system and later migrated to most of the other UNIX systems (such as AIX,HP-UX, etc.). Linux also has a French-written sysstat that implements the functionality of

If the command is not installed, thenInstallation yum-y Install SysstatSAR [Options] [-A] [-o file] t [n]T represents the time interval for sampling, n indicates the number of samples, and defaults to 1File indicates that the output information is saved to a document1. View CPU Usage[Email protected] ~]# Sar-u 10 3Linux 2.6.32-220.el6.x86_64 (SHJZDB4) 08/05/2016 _x86_64_(CPU)10:12:41 AM CPU%user%nice%system%iowait%steal%idle10:12:51 AM All 0.17 0.00

every 2 seconds.Iostat-C displays only CPU statistics. Mutually exclusive with the-D option.-D displays only disk statistics. Mutually exclusive with-c option.-K Displays the number of disk requests per second, in the default block of units, in units.-P Device | AllMutually exclusive with the-X option to display statistics for block devices and system partitions. You can also specify a device name after-p, such as:# iostat-p HDAor Show All devices# iostat-p All-T prints the time to collect data