Io_uring Without Readahead

← Home io_uring without readahead Aug 31, 2026 Someone opened a PR to implement readahead in Turso. It was a throwaway implementation, but a good excuse to measure io_uring and understand more about it. Turso has two backends. syscall uses pread(2). io_uring uses io_uring, and opens the database file with O_DIRECT with no option to use buffered I/O. O_DIRECT takes away kernel readahead, so getting it back means implementing it in the application.1 The PR’s results are impressive. io_uring