PyPy uses a tracing JIT -- it records hot loops and compiles them. GraalPy runs on GraalVM's Truffle framework with a method-based JIT. PyPy wins on n-body (13x vs 5.9x), but GraalPy dominates spectral-norm (66x vs 13x) -- the matrix-heavy inner loop plays to GraalVM's strengths. GraalPy also offers Java interop and is actively developed by Oracle.
Nature staff discuss some of the week’s top science news.
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