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개발/linux
시스템 체크 # 시스템 부하[root@master ~]# uptime 10:59:44 up 243 days, 21:23, 1 user, load average: 1.03, 3.11, 4.14 평균 부하(load average)의 다음에 나오는 세 개의 숫자(1.03, 3.11, 4.14)는 시스템에서의 1분, 5분, 15분 동안의 평균 부하를 각각 나타낸다.시스템의 평균 부하는 실행 가능한 상태 혹은 중단 불가능한 상태의 프로세스들의 평균 개수와 같다.실행 가능한 프로세스는 현재 CPU를 사용하고 있거나 CPU 사용을 위해 대기 중인 상태이고, 중단 불가능한 프로세스는 I/O를 기다리고 있는 프로세스다. 단일 CPU 환경의 시스템에서 평균 부하 1의 의미는 한 개의 CPU가 끊임없이 일을 하고 있다는 뜻이다. # t.. 2015.11.11
news/IT
How Can a File’s Size be Zero? We all occasionally run across a ‘situation’ on our computers that leaves us completely baffled, such as a file that has a size of zero, but how is that even possible? Today’s SuperUser Q&A post has the answers to a confused reader’s question.Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites.The Quest.. 2015.09.28
news/IT
How to Create ISO Files From Discs on Windows, Mac, and Linux ISO files are disc images — complete images of a CD or DVD bundled in a single file. This file can then be “mounted” and made available as a virtual CD or DVD, allowing you to convert physical discs to virtual ones.This is particularly useful if you want to use old game or software discs on a modern computer that doesn’t have a disc drive. Note that some DRM copy protection schemes won’t work wi.. 2015.09.28
news/IT
7 Ways To Free Up Hard Disk Space On Windows Hard drives are getting larger and larger, but somehow they always seem to fill up. This is even more true if you’re using a solid-state drive (SSD), which offers much less hard drive space than traditional mechanical hard drives.If you’re hurting for hard drive space, these tricks should help you free up space for important files and programs by removing the unimportant junk cluttering up your .. 2015.09.28
news/IT
Database Fundamentals for Analysts: Tables -- So what? We have seen that if database tables are designed to represent a set of (facts about) a single class of attribute-sharing entities each and to preserve the mathematical properties of relations, databases are easier to understand, and query results are guaranteed to be provably correct and easier to interpret. Let's see how and why with the help of an example.Consider numbers. They are abstract -.. 2015.09.28
news/IT
6 Alternative Browsers Based on Mozilla Firefox Mozilla Firefox is an open-source web browser, so anyone can take its source code and modify it. Various projects have taken Firefox and released their own versions, either to optimize it, add new features, or align it with their philosophy.These projects all have to release the source code to their browsers and can’t call them Firefox or use official Mozilla branding, such as the Firefox logo. .. 2015.09.28