Choco VS OptaPlanner

There are quite a few out there. I played with gecode as well as https://choco-solver.org/ which I found intuitive and fun to use.

I personally doesn't get surprised by POSIX to consider it's violating this "least surprise" amount.

Instead, for example Java has given me much more surprises, and at catastrophic levels. I was using Choco Solver [0] back in the day, and I created two instances of it, attached to different classes. Which is perfectly normal, right?

Somehow they've cross linked between these two instances, affected the results they have computed, and created persistent memory leaks which needed system reboots to claim back. Java should be immune to that, but no.

Preventing that needed to run only one instance of Choco, which limited my performance greatly. Luckily, the system had a queue/consumer structure, so running only one didn't need extensive changes.

[0]: https://choco-solver.org/

Sudoku is one of these types of problems, but it has very simple rules, so it’s a nice playground to try out different ways to solve graph colouring problems. This post outlines a solution using constraint programming with choco solver.

- Choco (https://choco-solver.org/): state of the art trailing solver, heavily tested, easy to get started with and actively maintained. Written in Java.

However, if you need to solve constraints etc., see: https://www.optaplanner.org/

Try looking for something built around Optaplanner - basically taking the end game of rostering and working backwards.

OptaPlanner takes some of the items tracked in tool like Odoo and creates plans based on them. I.E. how do you manage shifts while juggling multiple constraints (Jerry can only work weekends, Jeff can only work afternoons, Jim can work weekends but only on double time, etc.)

There is a library out there called Optaplanner that is designed for optimization of NP complete problems. It is hard to tell if that is exactly what this is, but I think you should be able to use this regardless.

Just stumbled upon https://www.optaplanner.org. Looks very interesting but also really overkill.

OptaPlanner - a generic scheduler.

OptaPlanner

I've never used it but it sounds like OptaPlanner may be a scheduler in the same vein?