Introduction to linux performance monitoring tools

This article mainly introduces the linux performance monitoring tool. For more information, see

1. uptime

This command intuitively shows the average load of the server in the past 15 minutes, 5 minutes, and 1 minute

2.Vmstat

Output vmstat information every 2 seconds, 10 times in total.

Category	Procs	Swap	Io	System	Cpu
	R: Number of running processes	Si: swap-in memory capacity	Bi: Number of read blocks	In: Number of interrupts	Us: User
	B: number of blocked processes	So: swap out memory capacity	Bo: number of written blocks	Cs: Number of context switches	Sy: System
					Id: Idle
					Wa: cpu waiting for io completion

3. iostat

Iostat information is output every 2 seconds, three times in total

Tps	Blk_read/s	Blk_wrtn/s	Blk_read	Blk_wrtn
Number of I/O requests sent to the disk	Number of blocks read per second	Number of blocks written per second	Total number of read blocks	Total number of blocks written

Note: this command contains cpu information and disk IO information. here we will briefly introduce several disk IO parameters. Note that blk_read and blk_wrtn are the total number of historical statistics, followed by the number of changes per second.

4. top

Top-d 10 views information every 10 seconds.

Contains load information, system running time information, cpu information, process information, and so on.

5. free-m

===== Mem row ======

Total: total memory,

Used: indicates the total number of resources allocated to the cache (including buffers and cache). However, some of these caches are not actually used.

Free: unallocated memory

Buffers: Number of buffers allocated by the system but not used

Cached: number of cache allocated by the system but not used

===== Buffers/cache row ====

Used: used-buffers-cached in the Mem row, total memory used

Free: The sum of unused buffers, cache, and unallocated memory. this is the actual available memory of the system.

6. sar

The sar command can be used to view the real-time running status of each hardware on the server. Because the meanings of the displayed parameters are similar to those of other commands, we will not detail them here.

Parameters.

(1) sar-d displays real-time disk information

 

(2) sar-B view the I/O and transfer rate statistics

 

(3) real-time cpu information displayed in sar-u

 

(4) view average loads in sar-q

 

(5) view memory usage in sar-r

 

(6) sar-n DEV: View network card traffic

 

Rxpck/s: Packets received per second

Txpck/s: Packets sent per second

Rxbyt/s: Number of bytes received per second

Txbyt/s: Number of bytes sent per second

Rxcmp/s: compressed data packets received per second

Txcmp/s: compressed data packets sent per second

Rxmcst/s: multicast packet received per second