For python developers who dislike the continued existence of the GIL in a multicore world, and who feel that multiprocessing is a poor response given the existence proofs of IronPython and Jython as non-GIL interpreter implementations, please consider moving to Julia.
Julia addresses nearly all the problems I've found with Python over the years, including poor performance, poor threading support on multicore machines, integration with C libraries, etc. I was a big adherent of Python but as machines got more capable, the ongoing resistence to solving the GIL problem (which IronPython demonstrated can be done with reasonable impact on serial performance) I could not continue using the language except for legacy applications.
Julia addresses nearly all the problems I've found with Python over the years, including poor performance, poor threading support on multicore machines, integration with C libraries, etc. I was a big adherent of Python but as machines got more capable, the ongoing resistence to solving the GIL problem (which IronPython demonstrated can be done with reasonable impact on serial performance) I could not continue using the language except for legacy applications.