IO has been one of the core parts of software development, and with the improvement of Internet technology, IO is becoming more and more important. Throughout the development community, the ability to skillfully use IO is important not only for companies but also for developers. Java's IO mechanism is constantly being
The Socket. IO instance in node. js, node. jssocket. io
1. Introduction
First Socket. IO Official Website: http://socket.io
The official website is very concise, and there is no API documentation. There is only one simple "How to use" for reference. Because Socket. IO is as simple and easy to use as the official websit
High-performance IO Design Mode: blocking/non-blocking, synchronous/asynchronous parsing, io Design Mode
When it comes to high performance, I think everyone like this. Today we will mainly understand several key concepts in high performance I/O design, the most important first step in doing anything is to make the concept clear, isn't it? Here is: blocking, non-blocking, synchronous, asynchronous.
OK. Now l
In the process of writing the driver program, it is seldom noticed thatIO portAndIo mem. Although some non-conforming code can achieve the ultimate goal, this is extremely not recommended.
1.CPUYesI386Architecture
InI386In series processing, memory and externalIoIt is an independent addressing.MemThe memory space of is32Bit can be addressable4G,IoSpace is16Bit can be addressable64 K.
InLinuxIn the kernel, accessIO portMust PassIO port. AccessIo memIt's cool, externalMemIt cannot be accessed in
This article was reproduced from: http://blog.sina.com.cn/s/blog_63f31f3401013jrn.htmlLet's start by knowing what the standard IO and file io are.Standard IO: Standard I/O is a standard I/O model established by ANSI C and is defined in a standard function package and stdio.h header file, with some portability. The standard IO
Use Socket. io to push messages in real time, and socket. io to push messages in real time.
Project Background
There is a social network module in a recently written project. You need to implement this function: when a user is liked, commented, or followed, the server needs to push a message to the user in real time. The final project address is https://github.com/noiron/socket-message-push. here we will in
Then draw on the theory in the UNIX Network programming Volume:The 2 main objects involved in IO operations are program processes, system cores. As an example of a read operation, when an IO read occurs, it typically goes through two steps:1, waiting for data preparation2. Copy data from the system kernel to the operation processFor example, in a read operation on the socket, step 1 waits for the network pa
http://elf8848.iteye.com/category/281637Objective:In general operations work often encounter such a scenario, the server's IO load is very high (util in iostat), but unable to quickly locate the IO load source process and source files resulting in the inability to make the appropriate policy to solve the problem.This phenomenon is more common on MySQL, and before 5.6 (Performance_schema provides
, directly submit the command + user buffer to the kernel driver, and then return immediately. At this time, the user thread can continue to run and do other things.
When you want to know the command completion status, you can use getqueuedcompletionstatus to obtain the completed request and data.
Therefore, you can submit a large number of IO requests first, and then process and return them slowly.
The reason why iocp is more efficient than epoll is
Basic Application of socket. io tutorial (2) socket. io tutorial
Preface
Socket. IO supports timely, bidirectional, and event-based communication. It can work on every platform, every browser, and every device, with the same reliability and speed.
Real-time analysis: pushes data to clients, which are expressed as real-time counters, charts, or log customers.
Java IO learning notes (3) Conversion stream, data stream, byte array stream, and io learning notes
Conversion stream1. Conversion stream: Convert byte streams to a bytes stream. After conversion, you can write content to the program with one character and one character. You can also call the write (String s) method of the character node stream, you can also apply BufferedReader () and BufferedWriter outsid
Objective:
In general operations work often encounter such a scenario, the server's IO load is very high (util in iostat), but unable to quickly locate the IO load source process and source files resulting in the inability to make the appropriate policy to solve the problem.
This phenomenon is more common on MySQL, and before 5.6 (Performance_schema provides IO
Performance Tuning: IO consumption analysis, performance tuning io consumption
Performance Tuning-> how to analyze io consumption
Reprinted please indicate the source: http://blog.csdn.net/supera_li/article/details/45225077For more information about the performance tuning series, see.Performance Optimization: Analysis of CPU consumptionPerformance Optimization:
1, event channel model. The event channel is the prototype of asynchronous IO.2, io mode, one IO call will go through two stages. First, wait for the data phase, the data from the network or disk read to the system kernel (kennel) Two, the data from the kernel copy into the process.Based on these two phases, the Linux system generates five network mode scenarios.
Java BASICS (12) IO input and output, java basics io Input and OutputI. IO Overview 1. IO concepts
IO: I represents Input; O represents Output.
In Java, IO is input and output based on a stream. AllSerializing data(SAVE) write to
Nonblocking Io)
In non-blocking modeaccept()Andread()During the operation, if the data in the kernel is not ready, it does not block the user process, but immediately returns a message. That is to say, after a read operation is initiated by a process, it does not need to block the wait all the time, but immediately gets a result.If the data is ready, the data can be read and copied to the user memory. If the result shows that the data is not ready, th
I. Synchronous blocking IO bio is a blocking IO, network communication for multi-client connection, the server is always consistent with the number of client threads to handle each client task, that is, the number of clients and threads 1:1, and read and write operations in the room block, when you have thousands of clients to connect, Causes the server to constantly establish new threads, resulting in low-
Node. js uses the socket. io method, node. jssocket. io
You can use socket. io to create a socket. io server. However, this server depends on a created http server.
After the http server is running, use the listen method to append a socket. io server to the http server.
Copy
Today, I summarize this point of Io flow, because when I used the IO stream, I knew only a few of the most commonly used IO classes, such as Fileinputstream,bufferedinputstream (buffer stream), etc. But I do not know where it is in the entire IO system, for the whole IO syst
use the bindiocompletioncallback function to deliver an asynchronous Io operation. On the IO completion port, the callback function is also executed by the thread pool thread.When the queueuserworkitem function or bindiocompletioncallback function is called for the first time, the thread pool is automatically created, or when timer-queue timers or registered wait operations are placed in the callback funct
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.