If the cache is not flushed, it will still be in memory between runs whether you... | Hacker News

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		PaulDavisThe1st on Jan 4, 2024 \| parent \| context \| favorite \| on: The One Billion Row Challenge If the cache is not flushed, it will still be in memory between runs whether you mmap it or not.

marginalia_nu on Jan 4, 2024 [–]

That depends a lot on the OS. I would not count on a 13 GB file being cached in RAM after having been read through once.

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