DPS921/Web Worker API

Project Summary

The following subsections includes the basic information about the project.

Team Members

1. Khang Nguyen
2. Anton Biriukov
3. Akshatkumar Patel

Brief Description

JavaScript is a powerful programming language of the web but it is single-threaded by nature. The Web Worker API, introduced in HTML5 and supported by modern browsers, remedies that by enabling web applications to execute computationally expensive JavaScript code in a background thread separated from the main interface thread. Besides that, a background thread can be shared between other threads in the same web application and, therefore, facilitates lightweight communication between multiple windows of that application. Overall, the project's objectives are to explore the Web Worker API and how to utilize it in improving the overall performance and user experience of web applications.

The Problem

Parallel computing has certainly become a very wide-spread and rapidly-developing area in programming. It comes from the fact that a number of resources grouped together can solve problems faster. We are all well-aware of multi-core and multithreaded CPUs and GPUs that provide technical compatibility to support parallel computing. There are a number of parallel computing libraries, such as OpenMP, MPI, TBB, that we have looked into in our course. However, we have not discussed any front-end web development APIs allowing for multithreading.

Modern web applications feature a wide range of computationally expensive tasks, such as data fetching, advertisement, image processing, and others. Until recently, parallel computation has been mostly applied on the backend part of web applications and not so much on the front-end. However, to keep up with the increased backend parallelism frontend also needs to utilize this technique. As stated previously, in our research project we will investigate how the use of Web Workers API might help us achieve this goal.

Web Workers API

Overview

Web Workers API, as specified in the HTML Living Standard, is an application programming interface that defines specifications for running scripts in the background independently of any user interface scripts. The first iteration of the Web Workers API standard was initially presented in 2010 with HTML5. Even though web workers not a part of JavaScript, but rather a browser feature, they can accessed through it. Web Workers are utilized by millions of websites across the web for a multitude of tasks, varying from image processing to artificial intelligence and even bitcoin mining. There is a number of interfaces defined in the Web Workers API, but we will mainly focus on the following two: Shared and Dedicated workers. Both of them inherit from the WorkerGlobalScope, which represents the generic scope of any worker, which primarily does the same thing as Window in the normal web content.

References

• HTML Standard, Web Worker section: https://html.spec.whatwg.org/multipage/workers.html