Linux Vmstat Use

Simple use of the Vmstat command

Vmstat command is a common system monitoring tool for Linux/unix, which can easily view CPU, memory, swap partition, IO reading and writing.

Vmstat commonly used parameters are two: 1. Time interval of acquisition 2. Number of acquisitions, e.g.

2. Indicates that the server state is collected 2 seconds per cell, 3 means that it collects 3 times, if it is #vmstat 2, it is collected every 2 seconds.

Keep collecting until you have finished the procedure manually.

The meaning of each parameter

R: A running queue can also be understood as how many processes are actually allocated to CPU resources

B: The process that represents blocking

SWAPD: The size of virtual memory already used, if greater than 0 indicates insufficient physical memory.

Free: Idle physical memory

Buff: Cache Size

Cache:cache records the buffering of our open files, etc.

Si: The size of virtual memory read from disk per second

So: the size of the disk written from virtual memory per second

Bi: Number of blocks received per second from a block device, i.e. read block device

Bo: Number of blocks sent to block device per second, i.e. write block device

In: Number of interrupts per second CPU

Cs: Is the number of context switches that occur per second for the CPU

Us: CPU time consumed by the user

Sy: System CPU Time

ID: Idle CPU Time

Wt: Wait iocpu time

Linux Vmstat Use