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1 uptimeThe uptime command can be used to see how long the server has been running and how many users are currently logged on.2 TopThe top command is a common performance analysis tool under Linux that shows the resource usage of individual processes in the system in real time, similar to the Task Manager for Windows.3 PSThe PS command is used to list those processes that are currently running on the system. The PS command lists the current snapshots
Original: http://blog.sina.com.cn/s/blog_68f1c17001016uvy.htmlLinux provides a number of tools for monitoring systems that can be used to identify bottlenecks that lead to reduced system performance. Slow system response is not always due to slow CPU, it may also be because the disk speed is too slow, the system installed less memory, network congestion or other slow-reacting system components caused.First,
need to monitor Linux Server System performance? Try these tools built in or attached to the system below. Most Linux distributions are equipped with a large number of monitoring tools. These tools provide metrics that can be used to obtain relevant information and system activities. You can use these tools to discover possible causes of performance problems. #1:
Common linux commands for Performance Testing
Common linux commands for performance testing.
1. uptime
[Root @ smgsim02 ~] # Uptime15:08:15 up 98 days, 2 users, load average: 0.07, 0.29, 0.14The number of times the system has been running since the current time the number of users logging on to the current system is
partition SWPD
Number of wait processes, B increased
Read-write Io,bi Bo increased
Si so greater than 0 starts reading from the hard drive
CPU wait time for IO wait, WA increased
2. Insufficient memory
Start using SWPD,SWPD not for 0
Si so greater than 0 starts reading from the hard drive
3. Io bottleneck
Read-write Io,bi Bo increased by more than 2000
CPU wait time for IO wait, WA increased by more than 20
SY system call time is long, IO
size of these three values can not generally be greater than the number of logical CPUs of the system.If the system in the output has 4 logical CPUs, if the three values of load average are longer than 4 o'clock, the CPU is busy and the load is high, which can affect system performance.But occasionally greater than 4 o'clock, do not worry, generally does not affect system performance. Conversely, if the output value of the load average is less than t
Managing Linux Hosts often seems like magic. Many administrators often simplify the process when encountering performance problems. They rely on hardware upgrades, larger memory and stronger CPU to solve the problem. In fact, using some simple commands, you can find many details about managing hosts and quickly and simply solve performance problems.
I. Top
For m
Many system administrators often simplify the process of encountering performance problems, relying on hardware upgrades, larger memory and stronger CPUs to solve problems, in fact, with some simple Linux commands, you can find many management host details and can quickly and easily solve performance problems. Here is a brief introduction to you.First, topFor man
Tags: How many performance relationship resources native Web Services tuning strThe Vmstat command is the most common Linux/unix monitoring tool that can show the status of a server at a given time interval, including server CPU utilization, memory usage, virtual memory exchange, IO Read and write situations. Compared to top, the Vmstat can see the CPU, memory, and IO usage of the whole machine, instead of
Tags: MySQL database optimizationOne, MySQL performance monitoring concernsQPS (query per second): The QPS here actually refers to the total amount of query that MySQL Server executes per second:QPS = Queries/secondsTPS (Transactions per second): There is no direct transaction counter in MySQL Server, we can only calculate the transaction volume of the system by rolling back and submitting counters. Therefo
Explanation of common CentOS Performance Detection commands
1. uptime
[Root @ smgsim02 ~] # Uptime15:08:15 up 98 days, 2 users, load average: 0.07, 0.29, 0.14
The number of times the system has been running since the current time the number of users logging on to the current system is 1 minute, 5 minutes, 15 minutes ago the current load
Load average is the average length of the queue, and the number of proc
Linux performance analysis tool top commands
The top command is a common performance analysis tool in Linux. It can display the resource usage of various processes in the system in real time and is often used for server performance analysis.Top Command description
[www.bkjia.com@bkjia-t-tomcat-188-193 ~]$ toptop - 16:0
%9A%84%E5%93%8D%E5%BA%94%E9%80%9F%E5%BA%A6% e5%88%a9%e5%99%a8/https://my.oschina.net/moooofly/blog/1570635.NETSTAT Network program Communication IP, port, service process number related information (display IP traffic)Https://linux.cn/article-2434-1.htmlCommon commands areNETSTAT-ANTP: Displays information about all TCP connectionsNETSTAT-TNLP: Lists TCP in the listenerNETSTAT-ANLP: List all the listening6.iftop: Network interface traffic
interrupt (software interrupts)% of CPU occupied
Line four: Memory status
Total Physical Memory
Total Free Memory
Used amount of memory in use
Buff/cache The amount of memory cached
Line five: Swap swap partition
Total Swap Area
Total Free Swap Area
Total swap area used by used
Avail Mem buffer Swap area total
Line six: status monitoring of each process (Task)
PID Process ID
USER P
(Hardware IRQ)% of CPU occupied
Si soft interrupt (software interrupts)% of CPU occupied
Line four: Memory status
Total Physical Memory
Total Free Memory
Used amount of memory in use
Buff/cache The amount of memory cached
Line five: Swap swap partition
Total Swap Area
Total Free Swap Area
Total swap area used by used
Avail Mem buffer Swap area total
Line six: status monitoring of each proce
When doing performance testing commonly used Linux Command 1, bandwidth use monitoring: sar-nDEV100rxpck/s: received packets per second txpck/s: Packets sent per second rxbyt/s: number of bytes received per second txbyt/s: Number of bytes sent per second 2. GC acquisition situation jstack... common Linux commands during perfo
Five big Linux simple commands to resolve system performance issues 2010-12-17 10:07 James Turnbull techtarget Chinafont Size:T | T Managing the performance of a Linux host often looks like a magic trick. Many administrators often simplify processing when encountering performance problems, relying on hardware upgrades
.
US, SY, ID, WA, ST: these all represent CPU time consumption, which represent user time, System (Kernel) time (SYS), idle time (idle), IO wait Time (wait), and stolen time (stolen, typically consumed by other virtual machines).
The above CPU time allows us to quickly understand whether the CPU is out of a busy state. In general, if user time and system time are added very large, the CPU is busy executing instructions. If the IO wait time is long, then the system bottleneck may be in d
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