A detailed explanation of the process of applying memory from user space to how the kernel allocates memory for it

Linux Memory Management absrtact : This chapter first examines the process memory management of Linux from the perspective of application developers, and builds on the kernel to discuss the system physical memory management and kernel memory usage.

Valgrind for memory checking

Valgrind can check for memory leaks, crossings, etc. Reference: Http://www.cnblogs.com/wangkangluo1/archive/2011/07/20/2111248.html http://blog.csdn.net/sduliulun/article/details/7732906 To use Valgrind for memory checking: 1. Copy the debug version

GPG Use instructions

Reproduced from: http://www.alexgao.com/2009/01/24/gpg/ Part I: generation, dissemination, void 1. Generate Key pair: GPG--gen-key Info: Solar (solar000) solar123@solar.com Key ID:538E9DA1 2, upload and download the public key: (for others t

Rhel 7.x uses Udev SCSI rules to configure RAW devices

1. Generate Rule File Touch/etc/udev/rules.d/99-oracle-asmdevices.rulesOrTouch/usr/lib/udev/rules.d/99-oracle-asmdevices.rules 2. Generate rulesThe SDB is not partitioned to execute the following shell script,For i in B;Todoecho "kernel==\" sd*\ ", s

Error: Implicit super constructor XX () is undefined for default constructor.

Error: Implicit super constructor XX () is undefined for default constructor. Must define an explicit constructorBecause your parent class has defined a constructor with a parameter and there is no default parameterless constructor in the parent cla

Valid UID actual UID saved settings user ID

UNIX environment Advanced Programming 8.11 mentioned in the user's actual ID, valid user ID, save the user ID set the concept of the time, I stuck, the internet to find a post, to do a detailed description. Collection of. 7.6 The USER ID of A PROCE

User account-User id: UID and GID

Although we login to the Linux host, the input is our account, but in fact, the Linux host does not directly know your "account name", it only know the ID. The correspondence between ID and account is in/etc/passwd. At least two IDs are obtained for

Chapter 2nd user, file operation and online Help: Writing who command

1. About Man commandThe man command uses option-K to search online help based on keywords, but only one keyword lookup is supported. The online manual is divided into a number of summaries, man followed by a summary number to see the different chapte

Ubuntu 12.04 FTP Server configuration

Installation: sudo apt-get install vsftpd # VSFTP (Very secure FTP) is a very secure and fast-stable FTP server in Unix/linux After installation, you may automatically generate an account "FTP",/home will also add a folder. If you do not generate thi

System v three kinds of IPC programming skillfully learn to remember __ programming

Reprint please keep the original address http://blog.csdn.net/guodongxiaren/article/details/43876207 Overview Three IPC mechanisms (Message Queuing, semaphores, and shared memory) have been invented on System V ("system Five") systems, often referred

four ways of MAP traversal

map<string, string> map = new hashmap<string, string> (); Map.put ("Key1", "value1"); Map.put ("Key2", "value2"); Map.put ("Key3", "value3"); The first: universal use, two times value System.out.println ("Through the Map.keyset

Ubuntu Change folder and subfolder permissions

How to modify the permissions of documents and folders (including subfolders) under Linux system, let's take a look. One introduction: You can use the command chmod to grant permissions to a file or directory. Linux/unix's file access rights are divi

The system () function uses __ function

one, System () Understanding Function: the system () function calls "/bin/sh-c command" to execute a specific command, blocking the current process until the command command has finished executing Prototype: int system (const char *command); return

Kerberos Basic Installation and configuration

Because of the recent need to use Kerberos authentication for the environment, there is very little understanding of Kerberos before, today, take the time to manually install Kerberos, so as to deepen the understanding of Kerberos. 1 Select a machine

GPG encryption and decryption and signature

In Ruan one peak great God's blog (http://www.ruanyifeng.com/blog/2013/07/gpg.html) goes to school gpg. Here after the practice of the record, in fact, mainly changed the layout, convenient for personal use. The key file is saved under ~/.gunpg/ Encr

Git compile installation with common commands

Git compile installation and common commands =========================================: compiling installation and setting 1.1: Introduction GitHub website address (download source package): https://github.com/git/ Git.git git downloads on systems su

Session and cookie differences and connections, session lifecycle, multiple service deployment session Management

The difference between session and Cookie Object Information size Save time Application Range Save location Session Small, simple data User activity time + a delay time (typically 20 minutes) Indiv

tcpdump use commands on Ubuntu to learn notes/tcp, IP, ICMP packet format

-Frequently used commands detailed Basic Commands $ tcpdump//default crawl all packets of the first NIC interface $ tcpdump–i ens33//crawl NIC ENS33 packet $ tcpdump host Listen for host receive all packets sent $tcpdump h

For faster R use Openblas

from:http://www.stat.cmu.edu/~nmv/2013/07/09/ for-faster-r-use-openblas-instead-better-than-atlas-trivial-to-switch-to-on-ubuntu/ installing additional BLAS libraries on Ubuntu For Ubuntu, there are currently three different BLAS options so can be e

Operating system principle and practice 5--the process switching of kernel stack switch

process switching based on kernel stack switching Difficulty coefficient: ★★★★☆ Experiment objective to deeply understand the concept of process and process switching, synthesize application process, CPU management, PCB, LDT, kernel stack, kernel st

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