pics io

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

1.I/O Basic Knowledge 1.1What is a file descriptor? In a network, a socket object is a 1 file descriptor, and in a file, 1 file handles (that is, the files object) are 1 file descriptors. In fact, it can be understood as a "pointer" or "handle", pointing to 1 socket or file object, when the file or socket changes, the object corresponding to the document descriptor, will also change accordingly.1.2What is I/O1, first understand what is I/O?I/O (input/output), which is input/output. The operating

Server-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-blocking IO (non-blockin

analysis of high performance IO model Server-side programming often requires the construction of high-performance IO models, with four common IO models: (1) Synchronous blocking IO (Blocking io): The traditional IO model. (2) Sync

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 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

analysis of high performance IO model Server-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

IO modelLinux system IO is divided into two phases: The kernel prepares the data and copies the data from the kernel to the user space.This diagram outlines the process of moving data from an external disk to the memory of a running program.User space, kernel spaceNow the operating system is using virtual memory, then for the 32-bit operating system, its address space (virtual storage space) is 4G (2 of 32)

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