> ## Documentation Index
> Fetch the complete documentation index at: https://modal-devin.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Configure resources and regions

> Choose compute and placement for Devin session workloads.

Set the resources for the Devin workspace by passing standard
[Modal Sandbox options](https://modal.com/docs/guide/sandbox-resources) to
`run_session()` in the generated application:

```python theme={null}
def session(session_id: str) -> None:
    worker.run_session(
        session_id,
        app=app,
        image=image,
        cpu=4,
        memory=8192,
        region="eu-west",
    )
```

These options control the Sandbox where Devin runs commands and edits the project.
The installed Modal SDK determines which
[`Sandbox.create` options](https://modal.com/docs/sdk/py/latest/modal.Sandbox#create)
are available. See Modal's general
[resource configuration guide](https://modal.com/docs/guide/resources) for request,
limit, and billing semantics.

## Configure orchestration policy

The surrounding Modal function manages the session lifecycle. Use its decorator for
[placement](https://modal.com/docs/guide/region-selection) policy when needed. Add
Modal function retries only deliberately: each retry is a fresh claim attempt with a
new acceptor identity.

```python theme={null}
@app.function(
    name="session",
    image=image,
    secrets=[devin_secret],
    timeout=worker.session_function_timeout_seconds,
    region="eu-west",
)
def session(session_id: str) -> None:
    worker.run_session(
        session_id,
        app=app,
        image=image,
        cpu=4,
        memory=8192,
        region="eu-west",
    )
```

These are two different placements: the function's `region` places the lightweight
orchestration call itself, while the Sandbox's `region` places where Devin
runs commands and edits files. Most deployments only need to set `region` on the
Sandbox. Set it on the function too only when you also want the orchestration call
co-located, for example alongside a database or internal service it depends on. When
constraining both, choose compatible regions and capacity available to your Modal
workspace.

## Managed options

Pass only keyword options other than `timeout`, `workdir`, or `readiness_probe` to
`run_session()`. `modal-devin` manages those values so it
can start, preserve, and clean up the session safely.

Use [`WorkerSettings`](/reference/settings) to change supported lifecycle timing.
Keep the function timeout at least `worker.session_function_timeout_seconds`.

## Scheduler policy

Edit the generated scheduler decorator to change its region or schedule. Keep
`max_containers=1`; it is required for safe dispatch with the current runtime.