Lightning Fast Elixir

I have this arbitrary career goal: I want to make a back end that serves millions of requests and does it blazingly fast. Having been a Rails developer for most of my programming career, I’ve been branching out to learn a new language. I was dabbling with Golang and even wrote with it. It’s fast for sure, but I wanted to see what else was out there.

Enter Elixir and Phoenix. Elixir is a new language built off of Erlang. Phoenix is a web framework for Elixir. And it’s fast. Lighting fast. Serve pages in microseconds fast.

First Impressions

Functional programming is weird. I tried to do an in Elixir and utterly failed. After that, I decided that some reading was in order. I bought Programming Elixir and started reading it, and that helped a ton. I could actually write some Elixir code after that. Nice. On to making a web app!

Phoenix is an MVC framework heavily inspired by Rails. In fact, I found that a lot of features of Rails are already present in Phoenix. Migrations, the awesome router we all know and love (albeit slightly different), even the flash. It’s a full-featured web framework for sure. Getting it up and running equally simple. Install Elixir, install Phoenix, generate an app, create your database, and run mix phoenix.server. Pretty simple.

A Test Drive

After I committed to a hack-a-thon that Quick Left hosted, I decided to use Phoenix for the back end of my team’s web app. Why not? I had yet to use it for something real and I didn’t really care about winning. So I used it. The result? I was surprisingly productive. We only had about 2 – 3 hours to write something. In that time, I spun up a web server with a couple JSON API endpoints that served (mocked) data for the JavaScript front-end.

I tried utilizing the database, but failed. I created 3 models with migrations, but ultimately failed to implement the controller actions for them correctly, so I scrapped it and just used mock data. But holy Batman, making those models and migrations was dead-simple because of the generators.


If I were 1) using the database and 2) serving from a real server (not localhost), I’m guessing this would be slower. But I don’t think it would slow down that much. Here’s the server log with response times:

[info] GET /api/shops
[info] Sent 200 in 756µs
[info] GET /api/shops
[info] Sent 200 in 774µs
[info] GET /api/shops
[info] Sent 200 in 752µs
[info] GET /api/shops/1
[info] Sent 200 in 920µs

Behold, MICROSECONDS. Have you ever seen that µ symbol in a server log before? My team mate had to Google it. Yeah…lightning fast.

To learn more about Elixir and all its capabilities watch the Engineering Lunch I just gave to see real world examples of how to use the language.


Phoenix is lighting fast but is still just as productive as Rails. More to come when I get something working in production.

Got an Elixir project you want to build? Talk to us. You can also check out the new Boulder Elixir Meetup hosted by myself at Quick Left’s Boulder office.