Introduction to Linux Performance monitoring tools

1.uptime

This command visually shows the average load of the server over the last 15 minutes, 5 minutes, 1 minutes

2.vmstat

Output the Vmstat information every 2 seconds, output 10 times altogether.

waiting for IO to complete

	procs	swap	io	system	cpu
>r	si: The capacity to swap into memory	bi: Number of Read blocks	in: Number of interrupts	us: User
 	b: Number of blocked processes	so: The capacity to swap out the memory	bo: Write to block number	cs: Number of context switches	sy: System
	 	 		 	id: Idle
 	 		 	 	wa: CPU

3.iostat

Output Iostat information every 2 seconds, output 3 times

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

Note: This command contains CPU information and disk IO information, which briefly describes several parameters for disk IO. It should be noted that the first Blk_read and BLK_WRTN are the total number of statistics, followed by the number of changes per second.

4.top

top-d 10 View the information every 10 seconds.

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

5.free-m

=====mem line = = =

Total: Amount of memory,

Used: Represents the number of totals that are allocated to the cache (including buffers and cache), but where a partial cache may not actually be used

Free: Unallocated memory

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

Cached: Number of cache numbers that are allocated but not used by the system

======buffers/cache Line =====

The total amount of memory actually used in the used-buffers-cached in the Used:mem line

Free: The sum of unused buffers with cache and unallocated memory, which is the system's current actual available memory.

6.sar

The SAR command allows you to view the real-time operation of each of the server's hardware. Since some of the parameter meanings shown are similar to other commands, this is not covered in detail, it focuses on

Several parameters.

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

(2) Sar-b View the I/O and transfer rate statistics

(3) sar-u Display CPU real-time information

(4) Sar-q view average load

(5) Sar-r View memory usage

(6) Sar-n DEV View network card traffic situation

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 packets received per second

TXCMP/S: Compressed packets sent per second

RXMCST/S: Multicast packets received per second