Document-linux IO mode detailed 1. Concept DescriptionBefore interpreting, there are a few concepts to be explained:-User space and kernel space-Process Switching-Blocking of the process-File descriptor-Cache I/O1.1 User space and kernel spaceNow that the operating system is using virtual memory, the 32-bit operating system, its addressing space (virtual storage space) is 4G (2 of 32). The core of the operating system is the kernel, which is independe
PrefaceHave seen in a very humorous way to explain the Windows Socket IO model, borrow this story, explain the Linux socket IO model;Lao Chen had a daughter who worked outside and could not come back often, and she contacted her by letter.Their letters will be delivered by the postman to the mailroom in front of their neighborhood. This is very similar to the socket model.The following is an example of the
This article mainly introduces node. socket. js. i/O advanced usage skills. This article describes the configuration, room, event, authorization, and other content. For more information, see Socket in the previous blog. IO, I briefly introduced Socket. i/O basic usage and a simple chat room DEMO is created. This article will continue to explore the advanced usage of Socket. IO Based on the introduction. Thi
Preface
Today, users expect fast and dynamic applications that can be accessed through the web. This article series shows how to use reverse Ajax (reverse Ajax) technology to develop event-driven Web applications. Part 1 of the series describes reverse Ajax, polling, streaming, Comet, and long polling ). You have learned how comet uses HTTP long polling. This is the best way to reliably implement reverse Ajax, because all existing browsers provide support. Part 1 of the series illustrates how to
In the high-performance I/O design, there are two well-known modes: reactor and proactor. The reactor mode is used to synchronize I/O, while the proactor is used for asynchronous I/O operations.
Before comparing these two modes, we should first understand several concepts, what is blocking and non-blocking, and what is synchronous and asynchronous, synchronization and Asynchronization are for the interaction between applications and the kernel. Synchronization means that the user process trigge
The concept is important and must be mastered. Practice is based on their own yo~~~~~~~~~~~~~~~~~http://blog.csdn.net/historyasamirror/article/details/5778378Stevens compared five IO Model in the article:Blocking IOnonblocking IOIO multiplexingSignal Driven IOAsynchronous IOSince signal driven IO is not commonly used in practice, I only refer to the remaining four IO
When learning Java NIO and IO APIs, a problem quickly emerges in the brain:When to use IO? When to use NiO?The author of this article will try to clarify some of the differences between Java NiO and Io, their use cases, and how they each affect our code design. The main differences between Java NIO and IO The following
Co-process: switch on IO operation.But when do you cut it back? How do I know I'm done with IO?Many programmers might consider using a "thread pool" or "Connection pool." The thread pool is designed to reduce the frequency of creating and destroying threads, maintaining a reasonable number of threads, and allowing idle threads to re-assume new execution tasks. Connection pooling maintains a connected cache
This is a creation in
Article, where the information may have evolved or changed.
Today we open a new standard library IO is also to continue the last time we did not finish the standard library, last time we only said Io/ioutil this time we continue to talk about the entire IO library
(1) func Copy(dst Writer, src Reader) (written int64, err error) Thi
These two articles analyze 5 kinds of IO models under Linux
http://blog.csdn.net/historyasamirror/article/details/5778378
http://blog.csdn.net/hguisu/article/details/7453390
Many people do not understand the concept of blocking/non-blocking, synchronous/asynchronous, do not know the difference between non-blocking and asynchronous Io, and generally think that non-blocking
[Java iO] _ compressing stream notes
Objectives of this chapter:Measure the test taker's understanding about the main functions of the compressed stream.Understand three compression formats supported by Java IoUnderstanding the functions of zipoutputstream, zipfile, and zipinputstream
3. Details
Zipentry
ZipoutputstreamCompresses a file or folder into a zip file.
Instance code:
Import Java. io. file; impo
Five IO models of LinuxReprint: http://blog.csdn.net/jay900323/article/details/18141217performance analysis of Linux five IO modelsDirectory (?) [-]
Conceptual understanding
Five types of IO models under Linux
Blocking IO Model
Non-blocking IO m
OverviewBefore we learn the IO stream of Java, we need to know a few key words
Synchronous and Asynchronous (Synchronous/asynchronous): synchronization is a reliable and orderly operation mechanism, and when we perform synchronous operations, the subsequent task is to wait for the current call to return before the next step is performed, whereas async is the opposite Other tasks do not need to wait for the current call to return, usually rely
1. Io Stream (Overview of IO Stream and its classification)
1. Concept
IO streams are used to process data transfer between devices
The Java operation of the data is streamed through the way
The classes that Java uses to manipulate the flow are in the IO package
Flows are divided i
embedded Linux system Programming (III)--standard IO Library with file io standard IO fopen fclose fread , fwrite io function, these functions are invoked on their own linux file io First,Standard buffering mechanism of
The difference between blocking and non-blocking is where the difference between synchronous IO and asynchronous IO is.Blocking vs non-blocking: Calling blocking IO will block the corresponding process until the operation is complete, and non-blocking IO will return immediately if the kernel also prepares the data.sync
Tags: request parameters Article href Border Order difference Monitor SeleReprint: http://blog.csdn.net/jay900323/article/details/18141217Five IO models and analysis of LinuxDirectory (?) [-]
Conceptual understanding
Five types of IO models under Linux
Blocking IO Model
Non-blocking IO model
Io SubsystemThe IO System of nebula3 is a huge improvement compared with Nebula1 and 2. The main design objectives of the new system are as follows:
Use a more standard mechanism, such as URI to locate resources, and Mime Type to differentiate data formats
A flexible stream model that does not care whether data comes from files, memory, HTTP connections, or other places
Data Types that do not read or wr
Java advanced ------ IO stream
Concept and basic classification of stream: Concept of stream:
Stream is a very visual concept. When the program needs to read data, it will open a stream to the data source, which can be a file, memory, or network connection. Similarly, when the program needs to write data, it will open a stream to the destination. At this time, you can imagine that the data is "Flowing" here ".Stream classification:
By data: input s
This article is reproduced from: http://blog.csdn.net/xushiyan/article/details/6941640, for reference, please visit the original link address. Did not find how to reprint the entrance, had to copy the full text. -----------------------------------Split Line------------------------------------------------- The SCSI subsystem in the LINUX kernel consists of the SCSI upper layer, the middle layer and the underlying driver module [1], which is responsible for managing SCSI resources and processing
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