Linux通过uptime查看系统负载是否过高的方法

[root@k8s-node1 a]# uptime
 17:16:23 up 49 days, 6:35, 4 users, load average: 1.04, 1.37, 1.65

饱和度 = loadavg / 逻辑 CPU 核数

nproc               
grep -c ^processor /proc/cpuinfo
lscpu | grep -i cpu\(s\)\: | awk '{print $2}'

- cpu核数：32
- loadavg：6.21

# 计算（保留一位即可，第二位可四舍五入）
6.21/32=0.2
# 0.2，属于非常空闲的状态

#!/bin/bash
cores=$(nproc)
read one five fifteen < /proc/loadavg
sat1=$(awk -v c="$cores" -v l="$one"     'BEGIN{printf "%.0f%%",l/c*100}')
sat5=$(awk -v c="$cores" -v l="$five"    'BEGIN{printf "%.0f%%",l/c*100}')
sat15=$(awk -v c="$cores" -v l="$fifteen" 'BEGIN{printf "%.0f%%",l/c*100}')
printf "CPU饱和度：\n1 min\t5 min\t15 min\n%s\t%s\t%s\n" "$sat1" "$sat5" "$sat15"

alias load="sh /路径/load_check.sh"

vim ~/.bashrc
# 在最后一行追加
alias load="sh /路径/load_check.sh"

# 保存退出
# source使其生效
sorce ~/.bashrc

[root@localhost ~]# load
CPU饱和度：
1 min	5 min	15 min
1%	1%	2%

nproc

load average: 6.21, 7.50, 9.00
               ↑     ↑      ↑
             1min  5min   15min