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 |
||
|
好 |
坏 |
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% |
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：
继续阅读 »
Yet 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 »