balloons io

1.1.Event-Driven Event-driven is a programming paradigm, a programming style that specializes in dealing with unknown events by binding an event, activating the thing after an external trigger, and achieving the purpose of performing certain operations. such as the browser's onclick () event1.2.IO Model Basics Before interpreting, there are a few concepts to be explained: User space and kernel space Process switching Blocking of proc

Disks are usually the slowest subsystem of the computer and are the most prone to performance bottlenecks because the disk is farthest from the CPU and the CPU accesses the disk to involve mechanical operations such as rotating shafts, track-seeking, etc. The speed difference between accessing the hard disk and accessing the memory is calculated in order of magnitude, just like the difference between 1 days and 1 minutes. To monitor IO performance, it

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

In order to prevent crawlers from crawling articles on unscrupulous websites, we hereby mark and repost the source of the article. Laplacedemon/sjq. Http://www.cnblogs.com/shijiaqi1066/p/3826251.html Socket. Io Socket. Io is used for real-time communication between the browser and node. js. Socket. Io is designed to support any browser and any mobile device. Su

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