Skip to content

ubuntu tweak

2019.01.29 22:23

WHRIA 조회 수:553

https://www.linuxbabe.com/ubuntu/4-tips-speed-up-ubuntu-16-04

 

 

2. Adjust Swappiness

We all know that RAM is way faster than hard drive.

Let’s do a little experiment: Boot your Ubuntu 16.04 system, open a few applications like Firefox, LibreOffice, Mozilla Thunderbird, Evince document viewer and then don’t do anything with it. Don’t suspend or hibernate it. Then after a few hours return to your Ubuntu 16.04. You will find that these applications are responding poorly to your mouse clicks because they were idle and swapped out to hard drive.

You can find in system monitor that Ubuntu is using swap space although you have plenty of free physical RAM.

 

This is due to the default swappiness value of Ubuntu. Swappiness is a Linux kernel parameter that controls how often Linux swap out idle processes to the swap space on your hard drive.

The value of swappiness is between 0 ~ 100. Lower value means Linux will use swap space less whereas higher value causes Linux to use swap space more often. The default value on Ubuntu is 60 which means when your computer uses up 40% of physical RAM, Linux kernel begins swapping.

You can use the following command to check the current value.

cat /proc/sys/vm/swappiness

It’s recommended to set a low value for swappiness so that Linux kernel will use as much physical RAM as possible. For example, to set swappiness to 10:

sudo sysctl vm.swappiness=10

Do not add space before and after the equal sign. This command tells Linux kernel to use swap space when 90% or more of physical RAM is used up.  This setting isn’t persistent.

To make it persistent across reboots, you need to edit a file.

sudo nano /etc/sysctl.d/99-sysctl.conf

At the end of this file, append the following line.

vm.swappiness=10

speed up Ubuntu 16.04 adjust swappiness

 

Save and close this file. (Press Ctrl+O to save, press Ctrl+X to exit) This tip is also applicable to your Ubuntu 16.04 server.

번호 제목 글쓴이 날짜 조회 수
1611 melanoma awareness [1] WHRIA 2019.12.27 45
1610 윈도우 raid ahci 전환 WHRIA 2019.12.26 37
1609 lvm 확장 [1] WHRIA 2019.12.25 48
1608 pytorch object detect / retinanet WHRIA 2019.12.22 214
1607 kaggle leakage WHRIA 2019.12.19 35
1606 pytorch - caffe WHRIA 2019.12.19 37
1605 pytorch mini batch size WHRIA 2019.12.19 82
1604 windows softraid monitor WHRIA 2019.12.19 66
1603 raid monitor WHRIA 2019.12.15 31
1602 SAS controller SAS 9212-4i WHRIA 2019.12.08 143
1601 Basic tutorial to develop driver on windows WHRIA 2019.12.07 375
1600 Keratinocytic Skin Cancer Detection on the Face Using Region-Based Convolutional Neural Network WHRIA 2019.12.07 324
1599 linux raid WHRIA 2019.11.30 46
1598 Micro- and macro-averages WHRIA 2019.11.29 140
1597 mcnemar WHRIA 2019.11.20 76

Powered by Xpress Engine / Designed by Sketchbook

sketchbook5, 스케치북5

sketchbook5, 스케치북5

나눔글꼴 설치 안내


이 PC에는 나눔글꼴이 설치되어 있지 않습니다.

이 사이트를 나눔글꼴로 보기 위해서는
나눔글꼴을 설치해야 합니다.

설치 취소