On 2015/01/13 3:23, jared / jaredbeck.com wrote:
> ~~~
> ruby --version
> ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0]
> 
> echo 'puts RUBY_VM_FIBER_VM_STACK_SIZE' | ruby
> -:1:in `<main>': uninitialized constant RUBY_VM_FIBER_VM_STACK_SIZE (NameError)
> 
> echo 'puts RUBY_FIBER_MACHINE_STACK_SIZE' | ruby
> -:1:in `<main>': uninitialized constant RUBY_FIBER_MACHINE_STACK_SIZE (NameError)
> ~~~

They are environment variables.