Knowledge points of composition thread of rendering process: Let’s take a look at the process in which the main thread, the composition thread, and the raster thread work together1.
By default, the mechanism of asynchronous programming is followed by Node.js. Therefore, message queuing can be understood asTask queue connecting user I / O operations with browser event loop system。. Suppose that in the process of executing the macro task of parsing HTML, two micro tasks, promise and mutationobserver, are generated. When a Node.JS web server receives concurrent requests, it need not create multiple threads because of the Event loop. key word:Multi process, single thread, event loop, message queue, macro task and micro task. So Epoll is responsive for pipes.
One execution of a threadIntroducing event loops into threadsSending tasks between rendering process threads, Thread model: queue + loopSending messages across processesSingle task too long, The timer was delayed due to a long taskLoop nesting calls setTimeout, Message loop system call stack recordWorkflow chart of XMLHttpRequestHTTPS mixed content warningMixed resource invalidation using XMLHttpRequest, If there is something wrong in the article, please correct and exchange~, We are looking forward to communicating with you and making progress together. It can manage packages that are local dependencies of a particular project and is the world’s largest online repository. Therefore, a “loop” is added to the event to change the main thread of the rendering process into the active state, which can be expressed in JS pseudo code as follows: The message queue can be divided into “message” + “queue”.Messages can be understood as user I / O; queues are first in, first out data structures.Message queue is a bridge between user I / O and event loop. It is because the OS takes care of downloading; we just ask it to download, then asking him: Finished? In an event-driven application, there is generally a main loop that listens for events, and then triggers a callback function when one of those events is detected. If our main thread is static and there is no loop, we can use js pseudo code to express it as follows: After executing mainthread() once, this code is invalid. At this time, because mainthread has an event loop, it will be captured by the browser rendering process’s main thread event loop system and respond to the corresponding event processor.
We can easily handle concurrent client’s requests. When we are downloading something via Request (HTTP) on the same 2-Core processor, 4, 6 or even 8 requests, it will take the same time. Once, I even didn’t pass a job interview because my answers did not match those of the interviewer, while he was sure to master that particular topic. We can’t directly “wait” on them in Epoll, but we can pipe them. Followings are some methods provided by Asyncio module to manage an event loop − 1. loop = get_event_loop()− This method will provide the event loop for the current context. I believe if you are a Node.js developer, and it doesn’t matter Junior, Mid or Senior level, you already know a lot about Node.js core, the event loop or that Node.js is single-threaded, or how the “setTimeout” or “setimmediate” function will be processed and so on. In Scenario 1, the client sends the request(a) to the server. Strive to become an excellent front-end engineer!
As the incoming request(b) does contain heavy computations, that is interaction with the database; the Node js checks for the availability of threads in the Internal thread Pool. Node.js’s built-in asynchronous I/O operations are more efficient than Workers can be.
We also looked through the concept of Node.js Platform, the popular frameworks available to build data-intensive, highly scalable Node.js applications, and its advantages.
There are many APIs (C++), and all this stuff is managed by Event Loop, implemented via libuv (C++). As the thread is found available to process the request(b), the request(b) is assigned to the thread.
When one of those nasty I/O steps needs to be done, the architecture sends that off to some other thread in a thread pool, then continues processing what's next in the queue. Answer for How does nginx get URL variables, Mozilla Firefox, gecko typesetting engine, SpiderMonkey and rhino, Some JavaScript 1.5 features and some JScript extensions [12], KHTML typesetting engine, Konqueror of KDE project, I executed a section of JS, and the page stuck for a long time before it responded, I triggered the click event of a button, and the click event handler responded, I used the setTimeout (callback, 1000) to add a delay of 1 s to the code.
Chrome multi process architecture mainly includes the following four processes: Advantages and disadvantages of chrome multi process architectureadvantage, Real hammer diagram of chrome multi process architecture, The rendering process mainly includes four threads.
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