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! 
Most Liked
ohm
It was probably listen. listen 3.3.0 fixed a lot of threading and process problems.
1
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.
1
Popular Backend topics
New
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
Inspired by this post by @stefan.jarina, I’m curious about the kind of Bash scripts you’ve written and whether you still use Bash given t...
New
To promote Tarearbol.DynamicManager I created the :heart_eyes_cat:-language (which is a brainfuck dialect.)
Code outputting “Meow” to th...
New
I did not add this to a “this weekend I’ll learn” like my few other journals as I am decided on using this in the long term.
Last I work...
New
New
I’ve been asked by my supervisors at work to finally give everyone in the team presentation about “that Elixir thing you can’t seem to sh...
New
I wrote a blog post! On F#. I usually don’t write things but figured i should try it out, also experimenting with F# and C# lately, love ...
New
I’ll be participating. This would be very interesting because I have been having coders block + a lot of distraction this weekend.
But l...
New
Hi all!, anybody tried this Elixir quiz from @Tetiana? She’s the one who made Elixircards.
New
Other popular topics
Which, if any, games do you play? On what platform?
I just bought (and completed) Minecraft Dungeons for my Nintendo Switch. Other than ...
New
My first contact with Erlang was about 2 years ago when I used RabbitMQ, which is written in Erlang, for my job. This made me curious and...
New
Build highly interactive applications without ever leaving Elixir, the way the experts do. Let LiveView take care of performance, scalabi...
New
Author Spotlight
Mike Riley
@mriley
This month, we turn the spotlight on Mike Riley, author of Portable Python Projects. Mike’s book ...
New
Author Spotlight
Erin Dees
@undees
Welcome to our new author spotlight! We had the pleasure of chatting with Erin Dees, co-author of ...
New
Author Spotlight:
Bruce Tate
@redrapids
Programming languages always emerge out of need, and if that’s not always true, they’re defin...
New
Big O Notation can make your code faster by orders of magnitude. Get the hands-on info you need to master data structures and algorithms ...
New
Will Swifties’ war on AI fakes spark a deepfake porn reckoning?
New
Node.js v22.14.0 has been released.
Link: Release 2025-02-11, Version 22.14.0 'Jod' (LTS), @aduh95 · nodejs/node · GitHub
New
Ok, well here are some thoughts and opinions on some of the ergonomic keyboards I have, I guess like mini review of each that I use enoug...
New
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /wasm
- /ruby
- /erlang
- /phoenix
- /keyboards
- /python
- /js
- /rails
- /security
- /go
- /swift
- /vim
- /clojure
- /emacs
- /haskell
- /java
- /svelte
- /onivim
- /typescript
- /kotlin
- /crystal
- /c-plus-plus
- /tailwind
- /react
- /gleam
- /ocaml
- /elm
- /flutter
- /vscode
- /ash
- /html
- /opensuse
- /zig
- /centos
- /deepseek
- /php
- /scala
- /react-native
- /lisp
- /sublime-text
- /textmate
- /nixos
- /debian
- /agda
- /django
- /kubuntu
- /deno
- /arch-linux
- /nodejs
- /ubuntu
- /revery
- /manjaro
- /spring
- /diversity
- /lua
- /julia
- /markdown
- /slackware








