factorize_rayon

Rayon find_map_any() demonstration program

This small program shows how effective and simple Rust's Rayon crate find_map_any() can be used to utilize all CPU cores.

However, it also shows that find_map_any() still has a bug in that it can get in a loop such that a thread closure correctly ending with a not-None option can at times never end. This behavior has been observed to occur not always. In certain cases it almost never occurs (e.g for test[1]), in other cases sometimes (like for test[2]), and in even other cases it happens every time (see test[2]).

Hopefully the Rayon support team can fix this bug.

P.S.: The factorize_iterative() function of mine was an experiment to try out find_map_any() with something not immediately trivial, but is of course not meant for production use. Better and fast algorithms exist, also in crates.io.