10gbps io

Note: This article is a lot of blog learning and summary, there may be an understanding error. Please take a skeptical look at the same time if there are mistakes to be pointed out. What is the difference between synchronous IO and asynchronous Io, what is blocking IO and non-blocking IO respectively? The answers given

I. OverviewWhat is the difference between synchronous (synchronous) IO and asynchronous (asynchronous) Io, what is blocking (blocking) IO and non-blocking (non-blocking) IO respectively? The problem is that different people may give different answers, such as wikis, that asynchronous

1. Questions:Recently in the real-time synchronization of the log, before the online is done a single part of the online log stress test, Message Queuing and client, the machine is no problem, but did not think of the second log, the problem came:A machine in the cluster top see the load high, the cluster of machine hardware configuration, the deployment of software are the same, but only this one load problem, the initial speculation that there may be hardware problems.At the same time, we also

Python basic-I/O model and python-io Model I. I/O model IO indicates Input/Output in the computer, that is, Input and Output. Because the program and runtime data reside in the memory, it is executed by the super-fast computing core of the CPU, which involves data exchange, usually disks and networks, and IO interfaces are required. What are the differences betwe

Let's start by talking about the objects and steps involved in IO. Take read, for example, to go through two stages:1) Wait for data preparation2) copy data from the kernel to the processTwo, blocking IO (blocking IO)In Linux, all sockets are blocking by default, and a typical read operation flow is as follows:So the blocking

poll the state, the appropriate time to call the blocking function, you can avoid blocking. For non-blocking objects, calling a special function can also enter a blocking call. The function Select is an example of this.1. Sync, that is, I call a function, the function does not end before I death the result.2. Asynchronous, that is, I call a function, do not need to know the result of the function, the function has a result notify me (callback notification)3. Blocking is called me (function), I

Thanks to the guidance of our predecessors, here is my own understanding, some pictures and passages from http://www.cnblogs.com/alex3714/articles/5876749.htmlHttp://www.cnblogs.com/Anker/p/3254269.htmlIf you encounter problems during your learning process, please contact: 2775724349 (because of their limited time, so may not often reply, but will collect each week to meet the problem, in Saturday to blog in the form of post)Blocking I/O (blocking IO)

Note: This article is a lot of blog learning and summary, there may be an understanding error. Please take a skeptical look at the same time if there are mistakes to be pointed out. What is the difference between synchronous IO and asynchronous Io, what is blocking IO and non-blocking IO respectively? The answers given

1. Pdflush Refresh dirty Data condition(Introduction to the principles and parameters of Linux io kernel parameter tuning) The previous section describes the key parameter parameters of the IO kernel tuning. It is concluded that the dirty data in cached is flushed to disk by Pdflush when one or more of the following conditions are met:(1)Data exists longer than Dirty_expire_centisecs (default 30s) time(2)Di