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Re:How We Went from 30 Servers to 2: Go by johnb on Wednesday March 13, 2013 @01:30AM (#5366994)
I don't think that's true. There are plenty of threadsafe gems with C extensions, and plenty of non-threadsafe pure ruby gems that mutate class/class-instance variable willy-nilly.
Re:How We Went from 30 Servers to 2: Go by boundlessdreamz on Wednesday March 13, 2013 @07:38AM (#5367820)
gems with C extensions are not supported https://github.com/jruby/jruby/wiki/C-Extension-Alternatives

I forgot about thread safety in pure ruby gems but that is not a huge problem - https://github.com/jruby/jruby/wiki/Gems-known-not-to-be-thr...