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技术 2022年11月11日
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vmstat命令

用法:vmstat 1 —>每个1s打印信息;

vmstat命令是最常见的Linux/Unix监控工具,可以展现给定时间间隔的服务器的状态值,包括服务器的CPU使用率,内存使用,虚拟内存 交换情况,IO读写情况。这个命令是我查看Linux/Unix最喜爱的命令,一个是Linux/Unix都支持,二是相比top,我可以看到整个机器的 CPU,内存,IO的使用情况,而不是单单看到各个进程的CPU使用率和内存使用率(使用场景不一样)。

一般vmstat工具的使用是通过两个数字参数来完成的,第一个参数是采样的时间间隔数,单位是秒,第二个参数是采样的次数

作用:

  • r:表示运行队列,如果改值过大,CPU可能会比较忙,使用率高;
  • b:阻塞并等待IO的进程数
  • swpd虚拟内存使用情况
  • free空闲的内存
  • buff被用来作为高速缓存
  • si(从磁盘分页到内存的数量)、so(从内存分页到磁盘的数量)两列,表示内存交换频繁程度,如果数值长期很大,表示内存不够;
  • bi读磁盘
  • bo写磁盘

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Linux内存管理机制

  • Linux有自己的内存管理机制,Linux会尽可能的使用内存来提升IO效率;
  • 如果系统的free不够用,达到触发机制后,系统会自动释放cache和buffer的内存供程序使用(cache和bugffer是由内核进行动态管理的)
  • 如果used很多,而cache和buffer所占比率很小,那说明可能内存不够用了。不能单看free的大小来判断。所以你可以简单理解为cache和buffer也是free的一部分。(可用memory=free memory+buggers+cached)
  • swan是在磁盘上开辟的虚拟内存,所以他的变化有可能导致与IO的交换也会增加;

内存不足的表现:

free memory急剧减少,回收buffer和cache也无济于事,大量使用交换分区(swpd),读写磁盘数量(IO)增多,大量CPU时间用于等待IO(wa)。

   建议:memory测试期间保证内存充足,可用内存不少于20%;

好的状态:s0 si趋于0

IO的瓶颈:

IO的瓶颈是现在系统常见的问题,还没有得到良好的解决方案,而且发展也不如CPU和MEM快

好:  iowait % < 20%

一般: iowait % = 35%

糟糕:iowait  % >=50%

以上数值仅供参考

CPU>wa 过大(参考值,超过20);

system>bi&bo过大(参考值,超过2000)

命令使用场景:

  vmstat监控如果US很高,将近100%,就需要使用top命名来看是哪个进程导致,然后在分析进程;

sy很高,可以尝试strace来看系统内核调用情况;

如果io异常,可以尝试使用iostat来看看

iostat(简单了解)

   单独执行iostat,显示的结果为从系统开机到当前执行时刻的统计信息;

avg-cpu:总体cpu使用情况统计信息,对于多核cpu,这里为所有cpu的平均值;

Device:各磁盘失败的IO统计信息

tps:  每秒IO次数

kB_read/s:每秒从失败(drive expressed)读取的数据量

kB_wrtn/s:每秒向失败(drive expressed)写入的数据量

kB_read:读取的总数据量

kB_wrtn: 写入的总数据量

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alt="" />

iostat -k 5 2

共执行2次,间隔5秒;和 iostat一样(iostat持续打印)

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alt="" />

iostat -x 显示更加详细信息 【重点】

rrqm/s:每秒这个设备相关的读取请求有多少被合并(请求相同Block时,请求合并)

wrqm/s:每秒这个设备相关的写入请求有多少被合并;

r/s:每秒读取请求数(rio)

w/s:每秒写入请求数(wio)

resc/s:每秒写扇区数(wsect)

rkB/s:每秒读取的数据量,单位K字节;

avgqu-sz:平均I/O队列长度

await:平均每次设备I/O操作的等待时间(毫秒)

svctm:平均每次设备I/O操作的服务时间(毫秒)svctm越接近于await则说明等待时间少

%util:表示了设备繁忙程度,80%表示设备已经很忙了;

<img 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alt="" />

IO瓶颈的症状:

1、%util很高

2、await远大于svctm

3、avgqu-sz 比较大

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