Shulou(Shulou.com)06/02 Report--

Four main indicators are monitored: cpu mem io load average (load)

1. Cpu

Use the sar-u or sar-u 55 commands to view CPU: (yum install sysstat needs to be installed)

User

System

If iowait is persistently high, there is a bottleneck in disk io. Solution: 1. Replace a better disk 2. The procedure is not handled properly and needs to be investigated

2. Load average (load)

Use the top command to view:

The sum of processes being processed by cpu + waiting for cpu processing over a period of time

1 minute, 5 minutes, 10 minutes

Generally focus on 5 minutes, 10 minutes.

Ideal laod average

< cpu个数 * 核数 * 0.7 cpu个数：grep 'physical id ' /proc/cpuinfo | sort -u 核数：grep 'core id ' /proc/cpuinfo | sort -u | wc -l 按住键盘上的数字1，可以看到cpu0、cpu1、cpu2的资源占用（0，1，2表示有3个cpu） 几个cpu一般来说比较均衡，cpu0相当于是带头大哥，如果它占的很高，这是个问题，需要解决 3. mem 使用 sar -r 或者 sar -r 5 5 命令查看内存 linux潜在规则：尽可能的使用内存来提高io的效率 free used cache buffer 总的物理内存=used+free 实际可用的物理内存=free+buffer+cache 实际使用的物理内存=used-buffer-cache %memused：可以直接看出用了多少，还剩多少 如果剩余的内存不多，那么需要加内存，或者程序问题（比如内存泄漏等） 4. io 使用 sar -d 或者 sar -d 5 5 命令查看io avgqu-sz：io队列的长度，队列越长，io压力越大 await： io操作的等待时间 ms -- 了解？ svctm： 被服务的时间 越接近await,等待的时间越少，io效果越好 -- 了解？ util： io繁忙程度 持续>

80%, need to be investigated because of what is busy

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.