wdm multiplexing

About I/O multiplexing:I/O multiplexing (also known as "event-driven"), the first thing to understand is that the operating system provides you with a feature that can give you a notification when one of your sockets is readable or writable. This way, when used with a non-blocking socket, only if the system notifies me which descriptor is readable, I go to the read operation, can guarantee that every read can read the valid data without doing the pure

Common types of Linux servers1. Multi-Process Concurrent server2. Multi-threaded Concurrent server3.select Multi-Channel I/O transfer server4.poll Multi-Channel I/O transfer server5.epoll Multi-Channel I/O transfer server Multi-channel IO is a single thread that manages multiple IO streams by recording the state of each IO stream at the same time, maximizing server throughput The biggest advantage of the count of Io multiplexing compared to multi-proc

,response.status_code) gevent.joinall ([ gevent.spawn (F, '/HTTP// www.oldboyedu.com/'), gevent.spawn (F, ' http://www.baidu.com/'), gevent.spawn (F, ' http://github.com/'),])-io multiplexing Monitor multiple socket objects for changes (readable, writable, send errors) -Example One:ImportSocketImportSelect# IO multiplexing: 8002,8001################################ "pseudo" concur

I plan to record examples of FFmpeg-based Encapsulation Format processing. Including separation, reuse, and Encapsulation Format Conversion of audio and video. This is Article 3rd. This document records an FFmpeg-based audio and video multiplexing (SimplestFFmpegmuxer ). The Muxer combines the compressed video data (for example, H.264) with the compressed audio data (for example, AAC ). I plan to record examples of FFmpeg-based Encapsulation Format pr

The first thing we need to know about select,poll,epoll is The mechanism of IO multiplexing. I/O multiplexing is a mechanism by which multiple descriptors can be monitored, and once a descriptor is ready (usually read-ready or write-ready), the program can be notified of the appropriate read and write operations. But select,poll,epoll are essentially synchronous I/O , because they all need to be responsib

This article transferred from: http://www.cnblogs.com/handt/archive/2012/08/10/2631728.htmlPort multiplexing, which literally means reusing a portRemember a classmate of Sina Weibo always automatically send messages, then let him check the local port, and then through the port to find the corresponding programAfter learning port multiplexing and thread injection, we found that this method is useless to the

1. What is port multiplexing: In the implementation of WinSock, the server can be bound multiple times. When determining who is using the multiple bindings, according to one principle, the person who specifies the person who submits the package is the clearest and has no permission. Such multiple bindings are called Port multiplexing. 2. How can we achieve socket port

Oracle control file multiplexing 1. Oracle control file multiplexing 1. show parameter control-- View Control File InformationShow parameter spfile-- Check whether spfile exists.Create pfile from spfile;-- Generate pfileShutdown immediate-- Close the database2. Modify the pfile and add multiple paths.Vi $ ORACLE_HOME/dbs/initORCL. oraCopy the original controlfile to the newly added directory;Cp ......3. c

Introduction to the network I/O multiplexing model select poll epoll First, we need to know that select, poll, and epoll are IO multiplexing mechanisms. I/O multiplexing uses a mechanism to monitor multiple descriptors. Once a descriptor is ready (generally read or write), it can notify the program to perform corresponding read/write operations. However, select

In fact, port multiplexing sounds very esoteric. In fact, it is very simple. You only need one function to achieve it: Setsockopt (socket S, int level, int optname, const char far * optval, int optlen ); Parameter: The identifier of the S socket, the level set by the level option, the optname option name, The optval option value, and the length of the optlen option value. One parameter is so_reuseaddr, one of the options in the option name. It can be

Refer to "Linux High Performance Server Programming"When dealing with multiple connections under Linux, it is inefficient to use only multithreading and raw socket functionsThen there is the SELELCT poll Epoll and other IO multiplexing functions.Epoll IO multiplexing with optimal performance is discussed hereThe user will need to focus on the socket connection using the IO

I/O multiplexing modelFirst, why do I need the I/O model, because the process is unable to directly manipulate I/O devices. It must assist with the I/O action through a system call request kernel. The kernel maintains a buffer for each I/O. For input, it takes time to wait for the data to be entered into the buffer, and it takes time to copy the data from the buffer to the process. Depending on the waiting pattern, I/O is divided into five categori

definition http/1.0 each request requires a new TCP connection and the connection cannot be reused. http/1.1 a new request can be sent on top of the last TCP connection established, and the connection can be reused. Advantages reduce the overhead of repeating the TCP three handshake to increase efficiency. Note: In the same TCP connection, the new request needs to wait until the last request receives a response before it can be sent. Implement I wrote an HTTP download page tool, the URL is in t

1. Basic Concepts IO multiplexing means that the kernel notifies the process once it finds that one or more IO conditions specified by the process are ready to be read. IO multiplexing is applicable to the following scenarios: (1) When the customer processes multiple descriptive words (generally interactive input and Network Interface), I/O must be reused. (2) When a customer processes multiple sets of inte

Remember Master Steven S.Best references: 1. Master from the Internet. 2. UNP V1 Chapter 1. 3. Man select, man pselect, man epoll, and man pollArticle 1: Overview Reuse is a great concept! What is I/O multiplexing (I/O multiplexing? Specifically, when the program you write needs to process multiple numbers simultaneously (socket, file, or device), you do not know when to do so (for example, you can read dat

introduction of five I/O models(1) blocking i/o[default] When the upper app invokes the RECV system call, if the peer does not send data (there is no data in the Linux kernel buffer), the upper application Application1 will block, and when the peer sends the data, the Linux kernel recv-side buffer data arrives, The kernel will copy the data to the user space. Then the upper app is unblocked and the next step is done. (2) non-blocking i/o[less use]The upper app app sets the socket to non-blocki

Zero. ObjectiveThis section will explain the definition and use of convection in the HTTP/2 protocol, in fact, it is said that HTTP/2 is how to achieve multiplexing.One. The relationship between flow and multiplexing 1. The concept of flowStream, the server and client are used in the HTTP/2 connection to Exchange frame data independent bidirectional sequence, logically can be regarded as a more complete interactive processing unit, that is, to express

I/O multiplexing uses a mechanism that can monitor multiple descriptors and, once a descriptor is ready (usually read-ready or write-ready), notifies the program to read and write. The I/O multiplexing technique is designed to address the technology that occurs when a process or thread blocks to an I/O system call, so that the process does not block a particular I/O system call.I/O

The essence of C + +-code reuse, interface multiplexing in another article mentions the three features of C + + core generalization, also written here.Encapsulation: Information hidingInheritance: Code ReusePolymorphic: Object-orientedC + + is not object-oriented, it embraces a variety of programming ideas, such as process-oriented, object-oriented, generic programming and so on.When I was in school, I understood that the ultimate essence of C + + was

As required by the course, a communication software for the local area network is required. I have been exploring this thing for the past few days. Today, I suddenly corrected the deviation in understanding the Select system call, so I decided to take a note of it to avoid forgetting it quickly. To verify that you have understood the application of select, I tried to simulate a group chat function. This function is simple. After multiple clients have successfully connected to the server, these c