bitbucket io

Introduction to websocket and other Reverse ajax Technologies In real-time web applications, a common method is reverse Ajax. Definition of reverse Ajax: Reverse Ajax (Reverse Ajax) is essentially a concept that can send data from the server to the client. In a standard HTTP Ajax request, data is sent to the server. Reverse Ajax can simulate an Ajax request in some specific ways, which will be discussed in this article, the server can send events (low-latency communication) to the client as quic

data type and string type into the dual pipeline of this link, to write structured data to a disk file, as shown in: 　 This is the major role of the link. The stream processing process by the stream processor must all have streams. If the streams processed by the stream class are classified, they can be basically divided into two categories: The first array, String, file, etc. This is called the original struct. Second, a stream of the same type is used as a link stream class, called a link pi

use a certain API to 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 cal

noun explanationMemory Space and IO spaceMemory space is the address space of the non-system memory area of the computer system, now the general X86 system provides 32-bit address, addressing 4G bytes of memory space, but the general computer only installs 256M bytes or less memory, The rest of the high memory is used for PCI or AGP and System bridge devices, the host can access the high-end memory like the system memory, so that the extended device h

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)

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