Hacker News Top Stories with Summaries (October 29, 2023)
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<h1> Hacker News Top Stories</h1>
<p>Here are the top stories from Hacker News with summaries for October 29, 2023 :</p>
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Electroreduction of nitrogen with almost 100% current-to-ammonia efficiency
Summary: Researchers have developed a high-efficiency, robust process for electroreduction of nitrogen with nearly 100% current-to-ammonia efficiency. Enabled by compact ionic layering in the electrode-electrolyte interface, the process uses a high-concentration imide-based lithium-salt electrolyte. This breakthrough could guide the development of sustainable ammonia production, potentially replacing carbon-based fuels and serving as a carrier for worldwide transportation of renewable energy.
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Arena Allocation in SBCL
Summary: This document discusses the implementation of arenas in the SBCL Lisp compiler. Arenas offer a mark/release paradigm for rapid deallocation of thread-local Lisp objects, aiming to reduce global heap usage. The implementation is built atop the existing pointer-bump allocator of 'gencgc' with provisions for redirecting the allocator's free-pointer. The document covers design considerations, implementation details, GC interaction, thread interaction, control mechanisms, best practices, and pending items.