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Re:Ask HN: Do you find working on large distributed systems ... by winrid on Monday February 21, 2022 @12:43PM (#30418471)
No modern DB uses mmap because it's unreliable and hard to tune for performance.

A custom cache manager will always perform better than mmap provided by the kernel.

The problem is you haven't explained how the overhead of a DB is too much. Sure, it sounds like a lot of work for your servers and the DB compared to reading from a hashmap.

Where I work right now we fire around 1.5B queries a day... to Mongo.

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