A simple way to understand the IOStat command
Introduction
The iostat command in Linux allows users to monitor system i/o statistics on the device. It is based on how long the devices are operating at the average baud rate to monitor the input/output of the system. Based on reports, system configurations can be changed to optimize CPU performance. This command is in the sysstat package.
Now we’re gonna teach you to use the iostat command in Linux.
Installing sysstat package
Since the iostat command is in the sysstat package, you need to install it:
$ sudo apt install sysstat
Output:
Using iostat command
To display monitoring reports:
$ iostat
Output:
In the output, you can see the CPU report and Device report.
Parameter:
- CPU
%user: % CPU usage
%nice: % CPU usage with nice priority
% system: % CPU usage at the system level
%iowait: % of CPU time idle and system request i/o
%steal: % virtual CPU waiting while another virtual processor is serving the hypervisor
%idle: % CPU time idle and no system request i/o
- Device
Device: the I/O device name
tps: the transfers per second
kB_read/s: the amount of data CPU read per second in kiloBytes (kB)
kB_wrtn/s: the amount of data CPU written per second in kiloBytes (kB)
kB_dscd/s: the rate of data CPU discarded per second in kiloBytes (kB)
kB_read: the total number of blocks read
kB_wrtn: the total number of blocks written
kB_dscd: the total number of blocks discarded
The syntax of the iostat command
$ iostat [option] [device-name]
option:
- -c: displaying summary of monitoring reports
$ iostat -c
Output:
- -d: displaying I/O devices report only
$ iostat -d
Output:
- -x: displaying the detailed report
$ iostat -x
Output:
- -m: displaying reports in MegaBytes
$ iostat -m
Output:
- -k: displaying reports in kiloBytes
$ iostat -k
Output:
- -p: displaying device block report
$ iostat -p
Output:
Conclusion
We just taught you to use the iostat command in Linux.
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