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I'd be interested in knowing more about why it's unpopular. I'm a fan of mmap() because I like the way it can simplify my code, and so far I've been pleased with the speed as well. But if there are subtle downsides I'd love to be aware of them. My instinct was that mmap() isn't used much because it's relatively new, and because it's traditionally had poor support on Windows.

I'm primarily a Linux user, but the best discussion I was able to find with a quick search was this exchange on freebsd-questions from several years ago: http://lists.freebsd.org/pipermail/freebsd-questions/2004-Ju...

Do you have know of any updated articles about it's performance tradeoffs?

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