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Currently, MRI (the reference implementation of Ruby) allocates 1MB of stack space for each thread. This is clearly sub-optimal, in particular for highly multi-threaded applications. We have successfully implemented dynamical stack extension for MRI, starting with a very small stack size and growing each stack only when needed. We will present two different implementations, one very close to the current stack structure, and one with a different stack structure. We will also explain how we made sure that our implementation is stable. On Linux, we achieve a memory reduction per thread of up to 30%, at the cost of an average speed increase (measured across all Ruby benchmarks) of 6%. RubyKaigi 2018 https://rubykaigi.org/2018/presentations/sugiyama-k
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