Testing for Threat Safety in Rails

Question

Now that Puma is the recommended web server for Rails on Heroku, they are warning of the dangers of using non-threadsafe code.

How do you test a Rails app for thread safety?

Answer 1

You generally test thread safety by assigning and verifying the value of a variable. In a rspec:

• fork 2 processes
• first process would assign the variable with a value
• first process would pause for a second
• second process would assign the same variable with a different value

Expected: both variable have different values