---
title: "solutions"
description: "Records how solutions improve over time, for every run, out of the box."
---

> Documentation Index
> Fetch the complete documentation index at: https://docs.cpbenchy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# solutions

## What it does

Records every run's solutions over time: for optimization problems, each better objective value the
solver finds, with when it found it. It is on by default, for every run, through CPMpy's solution
callback. Runs that are killed keep what they recorded.

## Use it

Nothing to do. To turn it off (no solution callback, for solvers where it costs time):

```python
import cpbenchy

cpbenchy.run("instances/", solvers=["ortools"], time_limit=60, args=["--no-solutions"])
```

```sh
cpbenchy run instances/ -s ortools -t 60 --no-solutions
```

## What it records

| | |
|---|---|
| `extra["solutions"]` | `[[seconds, objective], ...]` |

## Implementation

Source: https://docs.cpbenchy.com/library/solution-trajectory/index.mdx