Performance impact of the memoization idiom on modern Ruby
One major internal change in Ruby 3.2 was the introduction of object shapes. In this post, we’ll try to cover why they were introduced, how they work, and what their limitations are. How object instance variables are stored Because of how dynamic Ruby is, an operation as simple as accessing an instance variable is a lot of work. In most cases, Ruby objects store their instance variables in an arra
YJIT Is the Most Memory-Efficient Ruby JIT
This year, the YJIT team and I have gotten a paper accepted at MPLR 2023 (Managed Programming Languages and Runtimes), which is now freely available through ACM open access. The paper, titled “Evaluating YJIT’s Performance in a Production Context: A Pragmatic Approach”, goes into details of the strategy taken to evaluate YJIT’s performance in a production context. One of our key findings, when com
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