我的站点

一个系统软件工程师的随手涂鸦

Date: 十月 15, 2016

CentOS配置静态IP

VirtualBox里安装CentOS,配置静态IP

(1)CentOS 6,修改/etc/sysconfig/network-scripts/ifcfg-eth0文件:

......
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.1.9
NETMASK=255.255.255.0
GATEWAY=192.168.1.1

(2)CentOS 7,修改/etc/sysconfig/network-scripts/ifcfg-enp0s3文件:

......
BOOTPROTO="static"
ONBOOT="yes"
IPADDR="192.168.1.5"
NETMASK="255.255.255.0"
GATEWAY="192.168.1.1"
DNS1="192.168.1.1"
DNS2="8.8.8.8"

 

进程的priority和nice

本文选自Difference between nice value and priority in the top output,以Linux系统为例讲解进程的prioritynice
(1)

The difference is that PR is a real priority of a process at the moment inside of the kernel and NI is just a hint for the kernel what the priority the process should have.

Priority反映当时进程真正的优先级,而nice则是告诉kernel进程应该获得什么样的优先级。

(2)Nice的值从-2019-20表示优先级最高。通常情况下,priority = nice + 20,也就是priority的值为0~39。但是上述理论仅仅适用于调度策略是SHED_OTHER的进程,此外,kernel也有可能只改变priority的值,而nice的值保持不变,因此上述等式同样不适用。

Powered by WordPress & Theme by Anders Norén