2 ms·
Databases vendors usually find that read outperforms mmap. Mmap being fast is a myth.
by megagpt1 1mo ago
Databases vendors usually find that read outperforms mmap. Mmap being fast is a myth.
- yxhuvud 1mo agoNote that grandparent actually didn't say they used mmap to actually get the memory, just mapping it.
- Asmod4n 1mo agoTried every way to get contents of a file as fast to a client socket as possible. mmap and io_uring_prep_send were faster than everything else, no matter the size as long as you keep the map around for the lifetime of the process. for one off sends when a file is smaller than 256kb then io_uring_prep_read + prep_send are faster than everything else.
- megagpt1 1mo agoDatabases don't send files to client sockets as fast as possible. They do computation and lots of random access.