Iotop of Linux performance monitoring command series

Programmer Sean 2020-11-07 20:56:16
iotop linux performance monitoring command


Hello everyone ! I am a Sean!

Last time when it comes to iostat, Today, I'm going to talk about a command that looks like it iotop, The function is similar ,iotop It is used to monitor the disk I/O Usage status tools .

iotop( Monitoring disks I/O Usage status tools )

iotop command It is used to monitor the disk I/O In use top Class tools .iotop Have and top alike UI, These include PID、 user 、I/O、 Process and other relevant information .Linux Under the IO Statistical tools such as iostat,nmon Most of them can only count per Reading and writing of the device , If you want to know how each process works IO It's more troublesome , Use iotop Commands can be easily viewed .

iotop Use Python Written in language , requirement Python2.5( And above ) and Linux kernel2.6.20( And above ).iotop Provide source code and rpm package , It can be downloaded from its official home page .

CentOS You can install :

yum install iotop

Command parameter

-o: It only shows that there is io Process of operation
-b: Batch display , No interaction , Mainly used to record to file .
-n NUM: Show NUM Time , Mainly used in non interactive mode .
-d SEC: interval SEC Once per second .
-p PID: The process of monitoring pid.
-u USER: Process users monitored .

iotop Common shortcut key

 Left and right arrows : Change the order , By default, press IO Sort .
r: Change the sort order .
o: It only shows that there is IO Output process .
p: process / Thread display mode switch .
a: Show cumulative usage
q: sign out .

Common commands

iotop
Default display information
iotop -t
Add timestamp column
iotop -d 2 -n 3
2s Refresh 1 Time , Refresh the information three times and finish
iotop -u root
Show only root Under the user process io Information
iotop -a
Display information in a cumulative manner , Data from iotop Command to start the calculation
iotop -b > iotop.txt
Non interactive mode , You can use redirection to record information continuously for a period of time
iotop -k
With kB Unit displays read / write data information
iotop -q
Column names are printed only on the first iteration
iotop -qq
Column names never print
iotop -qqq
Don't print I/O Abstract 

Detailed command

Default display information

iotop
Total DISK READ
Total DISK WRITE
On the one hand, it represents the total read-write bandwidth between the process and the kernel thread , On the other hand, it also represents the kernel block device subsystem .
Actual DISK READ
Actual DISK WRITE
Represents the kernel block device subsystem and the underlying hardware (HDD、SSD wait ) The corresponding actual disk I/O bandwidth .
TID Thread number or process number
PRIO Thread runtime I/O priority
USER The user the process belongs to
DISK READ The amount of data read during the refresh interval
DISK WRITE The amount of data written during the refresh interval
SWAPIN Exchange usage per process
IO Of each process I/O utilization , Contains disks and switches
COMMAND Process name 

Add timestamp column

iotop -t

With kB Unit displays read / write data information

iotop -k

Data viewing skills
 Actually iotop The message displayed by the command is very obvious , Be clear at a glance , I usually use it to locate which process has occupied the disk IO, Last time iostat We can only see the disk of the system initially IO Whether the bottleneck has been reached , But it doesn't have to be a bottleneck , It's the result of some weird process , It can be used iotop Continuously observe the process level of IO situation , You can quickly find out which guy is making a monkey out of .

Mind map summary

Today's sharing is here ! Thank you for reading ! It's not easy to code words , If this article helps you , Do me a favor ~ ha-ha .

The mind map will be shared after the end of the performance monitoring command series , Welcome to the official account “ The programmer Sean”.

版权声明
本文为[Programmer Sean]所创,转载请带上原文链接,感谢

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