AstonJ

AstonJ

Rails console using 100% CPU in dev (fix)

If you are experiencing Rails console using 100% CPU on your dev machine, then updating your development and test gems might fix the issue - at least that’s what worked for me. Here’s my old and new (old versions are commented out):

# group :development do
#   # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
#   gem 'web-console', '>= 3.3.0'
#   gem 'listen', '>= 3.0.5', '< 3.2'
#   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
#   gem 'spring'
#   gem 'spring-watcher-listen', '~> 2.0.0'
# end

group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 4.1.0'
  # Display performance information such as SQL time and flame graphs for each request in your browser.
  # Can be configured to work on production as well see: https://github.com/MiniProfiler/rack-mini-profiler/blob/master/README.md
  gem 'rack-mini-profiler', '~> 2.0'
  gem 'listen', '~> 3.3'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end

# group :test do
#   # Adds support for Capybara system testing and selenium driver
#   gem 'capybara', '>= 2.15'
#   gem 'selenium-webdriver'
#   # Easy installation and use of web drivers to run system tests with browsers
#   gem 'webdrivers'
# end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara', '>= 3.26'
  gem 'selenium-webdriver'
  # Easy installation and use of web drivers to run system tests with browsers
  gem 'webdrivers'
end

Hope this saves someone a few hours of faffing around trying to troubleshoot the issue! :upside_down_face:

Most Liked

ohm

ohm

It was probably listen. listen 3.3.0 fixed a lot of threading and process problems.

ohm

ohm

I’ve had some trouble with spring just sitting there as well. spring is used to preload the app, so you can tear down and start up a server or console snappy.

Where Next?

Popular Backend topics Top

New
New
First poster: bot
AbstractMachinesLab/caramel. :candy: An Erlang backend to the OCaml compiler. Contribute to AbstractMachinesLab/caramel development by c...
New
First poster: bot
This Python script mimics Babbage’s Difference Engine. In Use this Python script to simulate Babbage’s Difference Engine, Python offered...
New
AstonJ
Consider this Erlang code: Rectangle = {rectangle, 20, 10}. {rectangle, Width, Height} = Rectangle. &gt; Width. 20 &gt; Height. 10 When...
New
finner
During a recent code review I came across this scenario: Code in review if (input.getValue() != null) { return Arrays.asList(value);...
New
First poster: bot
About Self Self is a prototype-based dynamic object-oriented programming language, environment, and virtual machine centered around the p...
New
ariandanim
Hello, i am facing difficult using webpack when to install within phoenix framework 1.5.7 because the webpack is still version 4.x.x inf...
New
rustkas
Intensively researching Erlang books and additional resources on it, I have found that the topic of using Regular Expressions is either c...
New
geo
I found a collection of code snippets for getting visitor ip address from api.geoipapi.com/json for blocking malicious ip addresses or ha...
New

Other popular topics Top

DevotionGeo
I know that -t flag is used along with -i flag for getting an interactive shell. But I cannot digest what the man page for docker run com...
New
Exadra37
Oh just spent so much time on this to discover now that RancherOS is in end of life but Rancher is refusing to mark the Github repo as su...
New
PragmaticBookshelf
Build efficient applications that exploit the unique benefits of a pure functional language, learning from an engineer who uses Haskell t...
New
AstonJ
If you want a quick and easy way to block any website on your Mac using Little Snitch simply… File &gt; New Rule: And select Deny, O...
New
DevotionGeo
I have always used antique keyboards like Cherry MX 1800 or Cherry MX 8100 and almost always have modified the switches in some way, like...
New
New
New
sir.laksmana_wenk
I’m able to do the “artistic” part of game-development; character designing/modeling, music, environment modeling, etc. However, I don’t...
New
AnfaengerAlex
Hello, I’m a beginner in Android development and I’m facing an issue with my project setup. In my build.gradle.kts file, I have the foll...
New
NewsBot
Node.js v22.14.0 has been released. Link: Release 2025-02-11, Version 22.14.0 'Jod' (LTS), @aduh95 · nodejs/node · GitHub
New