8a安装环境配置

1、磁盘分区格式：

RHEL 6.X：EXT4 文件格式；

RHEL 7.X：XFS 文件格式；

SUSE: XFS 文件格式。

2、建议关闭超线程、关闭 CPU 自动降频。高负载的情况下开超线程会增加等待时间。

（1）CPU模式performancee查看当前主频或

cpupower frequency-info 查看当前主频

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor查看工作模式

（2）cpupower -c all frequency-set -g performance 设置CPU工作模式为performance（高性能模式），如果BIOS里面没有改成performance，在操作系统层改成performance也不好使。

（3）cpupower frequency-info，信息如下，注意“current policy”里面的内容，如果“The governor "performance" may decide which speed to use

within this range.

”说明是performance，否则需要改BIOS，以下是信息的例子：

analyzing CPU 0:

driver: intel_pstate

CPUs which run at the same hardware frequency: 0

CPUs which need to have their frequency coordinated by software: 0

maximum transition latency: Cannot determine or is not supported.

hardware limits: 1.20 GHz - 3.10 GHz

available cpufreq governors: performance powersave

current policy: frequency should be within 1.20 GHz and 3.10 GHz.

The governor "performance" may decide which speed to use

within this range.

current CPU frequency: 2.40 GHz (asserted by call to hardware)

boost state support:

Supported: yes

Active: yes

3、关闭内存大页transparent_hugepage

echo never > /sys/kernel/mm/transparent_hugepage/enabled

echo never > /sys/kernel/mm/transparent_hugepage/defrag

4、查看磁盘调度,机械盘需要为deadline，SSD需要noop

cat /sys/block/sdb/queue/scheduler

noop [deadline] cfq

5、操作系统允许最大进程数设置

vi /etc/systemd/system.conf

DefaultTasksMax=infinity

6.尽量不使用swap

vi /etc/sysctl.conf

vm.swappiness=0

修改完毕后执行sysctl -p命令生效