Linux

1.Linux Link ConceptThere are two kinds of Linux links, one is called hard link (Hard link), the other is called Symbolic link (symbolic link). By default, the LN command produces a hard link. "Hard Connection"A hard connection refers to a

CPU Performance Metrics 1. Ratio of CPU used by user process 2. Ratio of CPU used by system process 3. Wio, waiting for I/O but the CPU is in idle state ratio. 4. CPU Idle Rate 5. CPU Ratio for context exchange 6,nice 7,real-time 8, run the length

Can monitor all resource states of the system. Average load, network card traffic, disk status, memory usage, and so on. Unlike other system state monitoring tools, it can print historical information that displays the System state information from 0

The working environment has migrated from Windows to Linux for some reason recently.     STM32 was originally developed under Windows and is now being developed on Linux instead. First of all, briefly describe the software and hardware development

Linux qt OpenCV installation Configuration (detailed edition) Directory Linux qt OpenCV installation configuration details directory Linux installation configuration 1 download system mirroring 2 system Partition 3 make U disk boot Disk 4

In the analysis of the previous section, 3 questions were left: Before parsing the ICMP packet processing process, I have the following questions: 1. Why to create a socket for each CPU only to send ICMP messages, do not use the socket can also send

Page buffering in the "Linux kernel Scenario Analysis" book section 5.6 of the document written and read a chapter in the detailed, here excerpt down; There are three main data structures in the file system layer, file structure, dentry structure

This section is mainly to analyze the NAT module-related hook function and target function, mainly to clarify the principle of NAT module implementation. 1.NAT-related hook function analysis NAT module is mainly in the nf_ip_prerouting,

Learning Linux for nearly one months, of course, I was in training institutions to learn, all progress faster (inseparable from the Marco ... , many students in the blog asked how to learn Linux, so write down this article. In order to avoid boring

the source of Linux process communication The process communication method under Linux is basically inherited from the process communication means on UNIX platform. The two main at&t that make a significant contribution to the development of UNIX

Link: http://blog.chinaunix.net/uid-20448327-id-4195269.html In Linux, a task can be configured to run automatically for a specified period of time, a specified date, or if the system average load is below a specified number. Red Hat Enterprise

Each process in a Linux system has 2 IDs, a user ID and a valid user Id,uid, which typically represents the creator of the process (which user created), and Euid represents the process's access to files and resources (with the same permissions as

FileName-> inode-> device block Turn from:Http://www.ruanyifeng.com/blog/2011/12/inode.htmlhttp://blog.s135.com/post/295/Http://hi.baidu.com/leejun_2005/blog/item/d9aa13a53b3af6e99152ee7e.html First, what is the inode. Understand the inode, from

First, view environment variables $ env Second, view the path $ echo $PATH Third, modify path How to set environment variables in Linux (export PATH) In general, you need to specify the path to the compilation tool when configuring the

Reproduced from: http://my.oschina.net/renhc/blog/54582 Today, a program that has been running for nearly a year has suddenly hung up, the problem is located to the system () function of the problem, the simple use of this function in my previous

Linux command ar-Create a static library. A file Purpose descriptionCreate a static library. A file. It's often used when developing programs with C + +, but I rarely use the AR command on the command line alone, which is generally written in

Let me briefly introduce The function of the WC (Word Count) command is to count the number of bytes, words, and rows in the specified file and display the statistics to output Format: WC file Command parameters: -C counts the number of bytes (bytes)

1, modify the user process to open the number of files limitOn Linux platforms, regardless of whether you write a client program or a server-side program, the highest number of concurrent TCP connection processing is limited by the system's number

Prior to the WebSphere MQ 7.1 release, there was only one instance of the installation of the product, on UNIX and Linux systems,Some soft connections are added to the/usr/lib,/usr/bin and/usr/include directories, which also point to the only

information in the Cat/proc/cpuinfoprocessor The ID of the logical processor. ID of the processor that physical ID physically encapsulates. the ID of the core ID for each key. CPU Cores The number of cores in the same physically encapsulated