标签类目:free

Linux 服务器性能分析

分类:RedHat

一、影响Linux服务器性能的因素

1. 操作系统级

       CPU

       内存

       磁盘I/O带宽

       网络I/O带宽

2.        程序应用级

二、系统性能评估标准

影响性能因素

评判标准

糟糕

CPU

user% + sys%< 70%

user% + sys%= 85%

user% + sys% >=90%

内存

Swap In(si)=0

Swap Out(so)=0

Per CPU with 10 page/s

More Swap In & Swap Out

磁盘

iowait % < 20%

iowait % =35%

iowait % >= 50%

继续阅读 »

手工释放linux内存——/proc/sys/vm/drop_caches

分类:Debian    当在Linux下频繁存取文件后,物理内存会很快被用光,当程序结束后,内存不会被正常释放,而是一直作为caching。这个问题,貌似有不少人在问,不过都没有看到有什么很好解决的办法。那么我来谈谈这个问题。

一、通常情况
先来说说free命令:
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Howto: Linux kill and logout users 如何结束终端并注销用户

分类:RedHatYet another newbie question that suggests people love to kill and show their power to rest of the world

There is a package called procps. It includes various useful (read as nifty) utilities. One of such utility is skill which is responsible to send a signal to users and process such as:

Halt user terminal
Kill user and logout 继续阅读 »


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