io_uring is faster than mmap

I can bite (softly) on part of that, since there is C code in the post. :)

This:

    size_t count = 0;
    /// ... code to actually count elided ...
    printf("Found %ld 10s\n", count);

is wrong, since `count` has type `size_t` you should print it using `%zu` which is the dedicated purpose-built formatting code for `size_t` values. Also passing an unsigned value to `%d` which is for (signed) `int` is wrong, too.

The (C17 draft) standard says "If any argument is not the correct type for the corresponding conversion specification, the behavior is undefined" so this is not intended as pointless language-lawyering, it's just that it can be important to get silly details like this right in C.