iostat tablets

Common tuning methods in linux and common tuning methods in linux Performance Tuning is one of the most important tasks for O M engineers. If your production environment experiences slow system response speed, abnormal hard disk I/O throughput, and the data processing speed is lower than the expected value, or if the CPU, memory, hard disk, network, and other system resources are exhausted for a long time, this article will help you. If not, add them to your favorites first. 1. hdparm: Command

the system and then make targeted adjustments, performance bottleneck refers to the factors that have a decisive impact on the system performance. Different application systems have different performance bottlenecks. Most of the performance bottlenecks of busy file servers are disk subsystems, the performance bottleneck of a large number of online application servers may be the CPU subsystem, while the performance bottleneck of various Internet network servers is usually the network bandwidth.

}mysql -h${MYSQL_HOST} -P${MYSQL_PORT} -u${MYSQL_USERNAME} -p${MYSQL_PASSWORD} -e "show slave status\G;" >/tmp/rep${MYSQL_PORT}.txtiostat=`grep "Slave_IO_Running" /tmp/rep${MYSQL_PORT}.txt |awk '{print $2}'` sqlstat=`grep "Slave_SQL_Running" /tmp/rep${MYSQL_PORT}.txt |awk '{print $2}'` result=$(cat /tmp/processlist${MYSQL_PORT}.txt|wc -l)echo iostat:$iostat and sqlstat:$sqlstat # if sl

Iostat View Linux HDD io performancerrqm/s:The number of read operations per second for the merge. Delta (rmerge)/swrqm/s:The number of write operations per second for the merge. Delta (wmerge)/sr/s:Number of read I/O devices completed per second. Delta (RIO)/sw/s:Number of write I/O devices completed per second. Delta (WIO)/srsec/s:Number of Read sectors per second. Delta (rsect)/swsec/s:Number of write sectors per second. Delta (wsect)/srkb/s:The nu

: Shows the activity of the process during the sampling time-y: Displays the activity of the end device during the sampling time-W: Displays the state of the system swap activity during the sampling time-O: The command result is stored in a binary format in the specified fileInterval: Sampling interval time, required parametersCount: Number of samples, default 1Example: Sar-u 1 3[Email protected]:~$ sar-u 1 3Linux 2.6.35-27-generic (user1-desktop) March 05, 2011 _i686_ (2 CPU)09:27 18 sec CPU%us

Iostat View Linux HDD io performanceRRQM/S: The number of read operations per second for the merge. Delta (rmerge)/sWRQM/S: The number of write operations per second for the merge. Delta (wmerge)/sR/S: Number of Read I/O devices completed per second. Delta (RIO)/sW/S: Number of write I/O devices completed per second. Delta (WIO)/sRSEC/S: Number of Read sectors per second. Delta (rsect)/sWSEC/S: Number of Write sectors per second. Delta (wsect)/srkb/s:

Guide Performance tuning has always been one of the most important work of operations engineers, if you are in a production environment encountered a slow system response, hard disk IO throughput anomalies, data processing speed is lower than expected, or such as CPU, memory, hard disk, network and other system resources have been exhausted for a long time, Then this article will really help you, if not, please collect them first. 1,hdparm viewing hardness reading speed:Command:

Bash command-C option is used to execute the subsequent string arguments as a bash script, seemingly superfluous, as if direct execution is possible,Actually, because the following string contains two command lines, the time command needs to count the execution times of the two command lines.(4) The parenthesis means another subprocess to execute the script in parentheses, DD This command line is not spoken here, do not know the words Baidu Bar.The focus is on the sync command, because when DD

is periodically cycled.L Delay: Represents the time interval between two outputs.L Count: The number of times that the interval is specified according to "delay". The default is 1.For example:Vmstat 3Indicates that the output information is updated every 3 seconds, the output is cycled, and CTRL + C stops the output.Vmstat 3 5Indicates that the output information is updated every 3 seconds, and the output is stopped after 5 times.Iostat is an abbreviation for I/O statistics (input/output statis

, if too high, indicates a long system call time, for example, the IO operation is frequent.ID Idle CPU time, in general, ID + US + sy = 100, generally I think ID is idle CPU usage, US is the user CPU usage, SY is the system CPU utilization.WT waits for IO CPU time.Five Iostat commandThe Iostat in a Linux system is an abbreviation for I/O statistics (input/output statistics), and the

One year after the launch of the iPad, manufacturers with confidence in Android tablets began to gradually lose confidence. The sales of Moto Zoom were not good. Samsung Galaxy Tab is not so much a tablet as a big mobile phone, ASUS and HTC have postponed the release of their Android tablets. It is said that Google has enough time to catch up after one year of iPad launch, but the reality has proved that th

Tablet and mobile phone support Do you still remember the content in the previous chapter? In resolution and multi-screen mode, we need to provide a variety of resources available to the system based on different screens, so that your app can be applied to many devices. And sometimes you want to further optimize them. For example, Tablet Provide more space for your app to display more information, but it can be displayed in several parts on your phone, not all at once. In most cases, the experie

After nearly one year of Research and Development, two Ubuntu tablets are now available. What is the situation? In December 1, GizChina showed two Ubuntu tablets, attracting interest. The screen of the Ubuntu tablet is as follows: the two Ubuntu tablets are configured as follows: "onewith10" capacitivedisplayandtheotherwitha9.7 "display, bothrunningon After nearl

from the perspective of our work.1.3 Hard Drive View 1, view hard disk and partition information:fdisk -l2. Check the disk space usage of the file system:df -h3. Check the I/O performance of the hard disk (show once every second, show 5 times):iostat -x 1 5The Iostat is included in the package Systat and can be installed with the Yum-y install Systat.Parameters that are commonly followed:如%util接近100%,说明产生的

According to Gartner, a research firm, sales of tablets are on the rise every week, and by 2016, flat sales will reach 665 million units worldwide. As the tablet-computer storm, which is represented by Apple's ipad, grows stronger, it is only a matter of time before mobile devices dominate the PC and become the preferred device for access to the network. Adobe's latest digital marketing report shows that users who use

This article discusses the serious problem of iowait caused by intensive transactions. 1. overview in linux, a database server with dual-sata disks and RAID 1 is installed. I ran a stored procedure and inserted tens of millions of records into a table. This is an intensive small transaction operation. In iostat detection, a large number of I... discuss the serious problem of iowait caused by intensive transactions 1. overview in linux, a database serv

/mpath8p1 Size: 5368698634242 FILEs found. Maximum Large MBPS = 183.53 @ Small = 0 and Large = 4Maximum Small IOPS = 851 @ Small = 10 and Large = 0Minimum Small Latency = 11.38 @ Small = 3 and Large = 0 4. Comparison and Analysis of resultsDuring stress testing, you can use the IOSTAT command to calculate the value. The maximum value varies slightly due to sampling. IOPS = [dm-13] r/s + [dm-14] r/s + [dm-13] w/s + [dm-14] w/s

Monitoring Htop is a more advanced interactive and real-time Linux Process Monitoring Tool. This command is similar to the top command, but has more functions, such as friendly user interface process management, shortcut keys, vertical and horizontal view processes. Htop is a third-party plug-in tool. You must use the yum software package management tool to install it on Linux. Htop installation instructions: Install htop in Linux (Linux Process Monitoring) 7. lotop -- monitors Linux di

1 Overview 1.1 factors affecting Linux Service Program Performance CPU, memory, disk I/O bandwidth, network I/O bandwidth1.2 Performance Evaluation CPU: user % + sys % Memory: Swap In (si) = 0; Swap Out (so) = 0; the Swap partition is not used. If Swap partition is frequently used, the memory may not be enough. Hard Disk: iowait % Network: as long as you have enough bandwidth to use it, achieving the NIC bandwidth in linux means no pressure. Here: % user: indicates the percentage of time when

Sometimes when we execute a command, we prompt:[Root @ localhost ~] # Iptraf-Bash: iptraf: command not found I believe many of my friends will often encounter this problem.To solve this problem, you need to install the corresponding software package. In many cases, the command name is not necessarily the software package name,The iptraf command here happens to be the name of the software package, which is a better solution. It is OK to directly install the software package. As follows:Yum instal