How are parallel tests parallel in Ruby 1.9.3?

Question

In Ruby 1.9.3, you are allowed to run several test cases at once . I'm not sure if this is a feature of the language, the miniature library, or the YARV function, so I apologize for any bad terminology.

But did they delete the GVL for this, or does it just mean that if one thread doing IO, another thread can use the CPU?

Answer 1

The implementation does not use threads, but individual processes interact through pipes. See this presentation . Thus, GVL / GIL does not come into play.