1. Mito
2. Overview
sar（System Activity Reporter, 系统活动情况报告): It is an excellent tool for monitoring the performance of Linux systems, including: file read and write conditions, system call usage, disk I / O, CPU efficiency, memory usage, process activities, and IPC-related activities.
3. Sar command common format
用法: sar [ 选项 ] [ <时间间隔> [ <次数> ] ]
选项:
[ -A ] [ -B ] [ -b ] [ -C ] [ -d ] [ -H ] [ -h ] [ -p ] [ -q ] [ -R ]
[ -r ] [ -S ] [ -t ] [ -u [ ALL ] ] [ -V ] [ -v ] [ -W ] [ -w ] [ -y ]
[ -I { <中断> [,...] | SUM | ALL | XALL } ] [ -P { <cpu> [,...] | ALL } ]
[ -m { <关键词> [,...] | ALL } ] [ -n { <关键词> [,...] | ALL } ]
[ -j { ID | LABEL | PATH | UUID | ... } ]
[ -f [ <文件名> ] | -o [ <文件名> ] | -[0-9]+ ]
[ -i <间隔> ] [ -s [ <时:分:秒> ] ] [ -e [ <时:分:秒> ] ]
among them:
interval: 采样周期，单位是秒；
count：采样次数，默认值是连续采样；
options：命令行选项。
There are many options for the sar command. Only common options are listed below:
-A：所有报告的总和
-u：输出整体CPU使用情况的统计信息
-v：输出inode、文件和其他内核表的统计信息
-d：输出每一个块设备的活动信息
-r：输出内存和交换空间的统计信息
-b：显示I/O和传送速率的统计信息
-a：文件读写情况
-c：输出进程统计信息，每秒创建的进程数
-R：输出内存页面的统计信息
-y：终端设备活动情况
-w：输出系统交换活动信息
Later reference: https://blog.csdn.net/shenjian58/article/details/105212862
