Comment by wmanley

I use mmap with my SQLite database[1] because I have many concurrent SQLite connections (one per concurrent HTTP request) and I don't want each connection to have its own 2MB cache[2]. It's better that all the connections simply share the page cache.

[1]: https://sqlite.org/pragma.html#pragma_mmap_size

[2]: https://sqlite.org/pragma.html#pragma_cache_size