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preface After learning multi process and multi thread, in contrast, when there are multiple concurrent connection requests, the multi process or multi thread model needs to create a process or thread for each connection, and most of these processes or threads are blocked. If 1000 clients are connected to the server at this time, 1000 pr ...

c + + get the current time 1. Basic concepts time stamp Timestamp is a time representation. It is defined as the total number of seconds from 00:00:00 on January 1, 1970 Greenwich mean time to the present. typedef __int64 __time64_t; typedef __time64_t time_t; In c + +, we define the data type time_t is the timestamp. At present, a c ...

1. System startup process 2. Start operation level 2.1 what is the operation level Run level: refers to the functional level at which the operating system is running system V init run levelsystemd target nameeffect0runlevel0.target,poweroff.targetShut down1runlevel1.target,rescue.targetSingle user mode (change password)2runlevel2.target,m ...

1, High availability introduction 1.1 what is high availability Generally, it means that two machines start the same business system. When one machine goes down, the other server can quickly take over, which is insensitive to the accessed users. 1.2 common tools Hardware commonly used: F5 Software usually uses: Keepalived 1.3 how does keepali ...

Background: In terms of linux, the linux operating system will have a main process with pid=1 and derive other processes to control different services For example: PID = 2 -- > Python PID = 3 – > java pid4 – > PHP, the three services may affect each other Users expect to run these three different services in different ...

High availability Generally, it means that two machines start the same business system. When one machine goes down, the other server can quickly take over, which is insensitive to the accessed users. For example, the company's network accesses the Internet through the gateway. What if the router fails and the gateway can't forward messages, a ...

I have written several small projects for novices, In order to facilitate everyone to learn and download the code, Decided to upload the code to the gitee server. It has to be said that git is a very easy-to-use code version management tool, This article teaches you how to upload your own code to Gitee. 1. Registered account Open web page https ...

A basic concept of interprocess communication 1.1 basic understanding of interprocess communication Inter Process Communication (IPC) Interprocess communication means that two different processes can exchange data. In order to achieve this, the operating system kernel needs to provide memory space that two processes can access at the same ti ...

Absrtact: RHash is a hash function library written in C language. It is a console utility for calculating and verifying magnetic links and various message summaries. This article is shared from Huawei cloud community< A taste of LiteOS components - play RHas >, by Lionlace. RHash is a hash function library written in C language, which ...

Role of DNS Service The function of converting domain names to IP addresses DNS concept DNS is a distributed database. The naming system adopts a hierarchical logical structure, just like an inverted tree. This logical tree structure is called domain name space. Since DNS divides the domain name space, organizations can use their own domain ...