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Channels are used in concert with the buffer in NIO. A channel is a bidirectional channel that is readable and writable. It is a bit similar to stream, but stream is unidirectional, the application does not directly perform read/write operations on the channel, but must use the buffer. For example, when reading a channel, you must first read the data into the corresponding buffer and then read it in the buffer. An example of using filechannel Package NiO; import Java.

it into a blocking state. When a process enters a blocking state, it does not consume CPU resources. File descriptor A document descriptor (file descriptor) is a term in computer science and is an abstract concept that describes a reference to a file. The file descriptor is formally a non-negative integer. In fact, it is an index value that points to the record table that the kernel opens files for the process that each process maintains. When a program opens an existing file or creates a ne

IO Model IntroductionTo better understand the IO model, we need to review it in advance: synchronous, asynchronous, blocking, non-blockingWhat is the difference between synchronous (synchronous) IO and asynchronous (asynchronous) Io, what is blocking (blocking) IO and non-bl

Netty Series (i) Linux network IO Model I. BASIC conceptBefore formally starting the Linux IO model, let's introduce 5 basic concepts.1.1 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 independent of the normal application, has

Transferred from: http://www.cnblogs.com/fanzhidongyzby/p/4098546.htmlThis is the clearest article I've ever seen explaining the IO model, and of course, if you want to learn more about it, continue to chew on the Sapphire book.Server-side programming often requires the construction of a high-performance IO model, with four of common IO models:(1) Synchronous blo

Reprinted from Http://www.cnblogs.com/fanzhidongyzby/p/4098546.htmlServer-side programming often requires the construction of a high-performance IO model, with four of common IO models:(1) Synchronous blocking IO (Blocking io): The traditional IO model.(2) Synchronous non-bl

Final effect: Material: Drag the clouds into the diagram, Ctrl + T to adjust the position, double-click the layer to bring up the layer style, hold down the ALT key to slide the blend color with the next layer

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

Tags: advantages about select exactly progress bar IMG bit Operations 3.3 update1 Concept DescriptionBefore interpreting, there are a few concepts to be explained: User space and kernel space Process switching Blocking of processes File descriptor Cache IO 1.1 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

This article was reproduced from: http://mp.weixin.qq.com/s?__biz=MzAxODI5ODMwOA==mid=2666538919idx=1sn= 6013c451b5f14bf809aec77dd5df6cffscene=21#wechat_redirectOn a "chat chat synchronous, asynchronous, blocking and non-blocking" has been popular explanation, to understand the synchronous, asynchronous, blocking and non-blocking important two conceptual points, have not seen, it is recommended to read this blog post to understand the two conceptual points. In cognition, a unified model is estab

Transfer from http://storage.it168.com/a2011/0323/1169/000001169755_all.shtmlAs a database administrator, pay attention to the performance of the system is one of the most important tasks, and in all aspects of attention to performance can only IO performance is the most troublesome piece, facing a variety of jerky parameters and dazzling new terminology, coupled with the memory maker's flicker, always let us have a foggy feeling. This series of artic

I have known asynchronous IO for a long time, but it has not been used recently to solve the actual problem (in a CPU-intensive application, some data to be processed may be stored on the disk. The location of the data is known in advance, so an asynchronous IO read request is initiated in advance. Wait until you really need to use these... information I have known asynchronous

On a "chat chat synchronous, asynchronous, blocking and non-blocking" has been popular explanation, to understand the synchronous, asynchronous, blocking and non-blocking important two conceptual points, have not seen, it is recommended to read this blog post to understand the two conceptual points. In cognition, a unified model is established.In this way, when we continue to read this article, we will not understand the deviation. So what is the difference between blocking

Synchronous (synchronous) IO and asynchronous (asynchronous) Io, what is the difference between blocking (blocking) IO and non-blocking (non-blocking) IO, respectively. The problem is that different people may give different answers, some think asynchronous IO and non-blocki

-blocking: When an event or task is executing, it issues a request action that, if the requested action requires a condition that is not met, immediately returns a flag informing that the condition is not satisfied and will not wait there.This is the difference between blocking and non-blocking. That is, the difference between blocking and non-blocking is that when a request is made, if the condition is not met, it waits or returns a flag message. blocking i