Linux

what is a hot and cold page? The concept of hot and cold pages is introduced in the buddy system of the Linux kernel physical memory management. A cold page indicates that the free page is no longer in the cache (generally refers to L2 cache), and

Here's a piece of Java code, public class Z {public static void Main (string[] args){New Z ();}Private Z (){Z A1=this;Z A2=this;Synchronized (A1) { try {A2.wait ();System.out.println ("Done Waiting");}catch (Interruptedexception

POSIX semaphores are real-time extensions that are part of the POSIX standard system interface definition. The XSI IPC defined in the SUS (Single UNIX specification) specification also defines the system interface that people commonly refer to as

Today, early in the morning found that the Web site login, apk package also upload server, so the elimination of problems, and finally inadvertently used the DF-L command to see the problem is found. The command results show:/dev/mapper/volgroup-lv_

Compile and use the Curl Static library under Windows I won't say it, it's simple ... Linux is compiled below the Libcurl.a file, However, in the program statically linked to this LIBCURL.A file, there will be a lot of link errors, if the dynamic

The first way of pre-dependency is as follows: The underlying command depends on the following (Debian-like Linux commands)sudo apt-get update sudo apt-get install -y gitsudo apt-get install -y curlsudo apt-get install -y android-tools-adb sudo

There are two main tasks for a device driver:1. Accessing the device's memory2. Interruption of processing equipmentFor the first task. The UIO core implements the Mmap () capable of handling physical memory (physical memory), logical

2017-07-20Eventfd in Linux is a relatively new process of communication, and the semaphore is different than the event can not only be used for inter-process communication, but also the user to send signals to the user layer of the process. EVENTFD

Starting with 2.6.13-RC3, the Linux kernel provides the ability to dynamically bind and Unbind devices and device drivers in user space. Prior to this, the insmod can only be bound and reconciled through the modprobe and rmmod, and this binding and

When shutdown immediately, alert log appears with the following error message and does not close properlyKkjcre1p:unable to spawn JOBQ slave process, slot 0, error 1089The problem was caused by bug23102157 , looking at MoS, and without a patch for

emule Resources, please use emule/amule or thunder download:x86[Url=[Red Hat Enterprise. LINUX.5]. Tlf-soft-redhat.enterprise.linux.5.update.1-xiso.iso (2.78 GB)]redhat.enterprise.linux.5.update.1.iso[/url][Url=[Red Hat Enterprise. LINUX.5].

usage rights: all rolesHow to use:CD [TargetDir]role: This command is used to switch the working directory in LinuxNote the point:The 1.targetDir represents the target directory and can be represented by an absolute or relative path;2. When

Virt:virtual Memory usage Virtual RAM1. The process "required" virtual memory size, including the library, code, data, etc. used by the process2, if the process to apply for 100m of memory, but the actual use of only 10m, then it will grow 100m,

A simple way to port Linux code to WindowsA ObjectiveLinux has a wealth of source code resources, but most of the code is not compiled properly on Windows platforms. The Windows platform simply cannot directly exploit these source code resources. If

Streaming media refers to the continuous time-based media transmitted using stream technology in the network. It features that the entire file does not need to be downloaded before playback, but is played by downloading and playing, it is the

Install CentOS 7 and centos with a USB flash drive on Windows 7 If you already have Windows 7, you have to install CentOS 7 again.1. Divide disk space Separate the installation space for CentOS 7 from the disk. If you have multiple hard disks, you

IP address, subnet mask, network number, host number, network address, host address, IP address IP Address: 4-segment decimal, 32-bit binary, for example, 192.168.1.1 binary is: 11000000 | 10101000 | 00000001 | 00000001The subnet mask shows how many

Linux ntp time server configuration tutorial, ntp server configuration Network Time Protocol (NTP) is also a new test requirement for RHCE. During study, I also reviewed how to set the Linux Time. Now I will share it with you.It is not difficult

RabbitMQ cluster configuration, rabbitmq Cluster Reference: This article describes the basic installation and basic cluster configuration of rabbitmq.I. Environment 1. Operating System CentOS-7-x86_64-Everything-15112. Version Haproxu version: 1.7.7

Yum install php Requires: libzip5 (x86-64)> = 1.3.2 During the experiment, when php is installed using an rpm package, the version of the system is always old. When you want to install a new version of the php rpm package, you will find that the