Adding Concurrency to our Web App - Go Lang Practical Programming Tutorial p.24

TL;DR

This tutorial demonstrates how to use Go routines and channels for concurrency in a web app to significantly reduce response time.

Transcript

what is going on everybody welcome to part 24 of our go language programming tutorial series in this tutorial what we're in an attempt to do is apply what we've been learning up to this point with channels and go routines concurrency in general to our web app to see if we can make it go a little quicker because right now it's pretty slow so what I'... Read More

Key Insights

• ❤️‍🩹 The Google Chrome developer tool is effective in identifying performance bottlenecks in web applications, even for back-end processing.
• 😀 The idle time in the web app can be significantly reduced by implementing concurrency using Go routines and channels.
• 📰 The modification of the news aggregator handler involves separating the code into a new function, using channels to return values, and implementing synchronization with wait groups.
• ⌛ By using Go routines and channels, the response time of the web app can be reduced by more than six times.
• 🫰 Additional optimization can be achieved by loading the site map index information outside the news aggregator handler and implementing pagination to reduce the amount of data passed.
• 😥 The tutorial points out that further improvements in web app performance may require front-end web development techniques.

Questions & Answers

Q: What is the purpose of channels and Go routines in this tutorial?

Channels and Go routines are used to introduce concurrency to the web app, allowing the execution of multiple tasks simultaneously, resulting in improved performance and reduced idle time.

Q: How is the idle time causing slow response time in the web app?

The web server is fetching information from various site maps every time the slash AGG page is visited, resulting in significant idle time as the browser waits for the response.

Q: What changes are made to the news aggregator handler to implement concurrency?

The code responsible for fetching the response, unmarshalling it into the news variable, and closing the response is moved to a separate function called "newsRoutine." This function is executed as a Go routine and returns the values through a channel.

Q: How is synchronization achieved in the modified news aggregator handler?

The sync package is imported, and a sync.WaitGroup is created to handle synchronization. The wait group is incremented before iterating over the news types received from the channel and is decremented after completion.

Summary & Key Takeaways

• The tutorial aims to enhance the performance of a web app by applying the concepts of channels and Go routines.

• By utilizing the Google Chrome developer tool, the idle time is identified as the bottleneck function, causing slow response time.

• The tutorial explains the modification of the news aggregator handler to use Go routines, channels, and synchronization.