Mmastodon TechnologySoftware first seen 7 h ago, last 7 h ago, peak #12
The 1-to-512 math behind page table overhead
Original: A 4 KiB data page costs 8 bytes to map. That is a ratio of 1 to 512. When one address space maps a page once, the page t
A discussion of memory management arithmetic is making the rounds: a 4 KiB data page requires only 8 bytes of page table entry, a ratio of 1 to 512. When a page is mapped just once in an address space, page table overhead amounts to roughly 1/512 of mapped memory, a figure programmers find striking.
Why now: The elegant ratio offers a clear, quotable insight into virtual memory overhead, resonating with developers interested in systems programming.
page tablesvirtual memoryx86-64
Evidence
- A 4 KiB data page costs 8 bytes to map. That is a ratio of 1 to 512. When one address space maps a page once, the page table overhead is roughly one 512th of th # python # programming # tutorial # ai # software # coding # development # engineering # inclusive # community Page… · hackaday@www.urbanmind.net · 3
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