https://pavelguzenfeld.com/tags/memory/Recent content in Memory on Pavel Guzenfeldhttps://pavelguzenfeld.com/images/og-default.pnghttps://pavelguzenfeld.com/images/og-default.pngHugoen-usTue, 20 Oct 2026 00:00:00 +0000https://pavelguzenfeld.com/posts/cpp-zii-arena-allocator/Tue, 20 Oct 2026 00:00:00 +0000https://pavelguzenfeld.com/posts/cpp-zii-arena-allocator/ZII designs every type so all-zero bytes is a valid default, and pairs it with arenas that free a whole group at once. RAII ties cleanup to each object. Here is how the two differ, where ZII falls short, a 20-line arena, and a nanobench run of 1000 allocations per frame: arena, std::pmr, malloc, calloc and new, with a live Godbolt session. Plus a struct-of-arrays layout, a Cortex-A78AE run, and the Jetson Orin GPU, then one CPU+GPU frame that uses all of it: 3.3x faster per frame.