# Runners & Concurrency

### Runners

Once you have setup an integration with your CI-provider, your build-jobs will be processed by our runners as soon as the configured pipeline is triggered.

#### Active Runners

Runners which are currently scheduled to start, starting or running can be seen in the tab “Active Runners” on the subscription- or integration details.

#### Runner History

Past runners can be found in the “Runner History” tab on the details page of your integration.

#### Debug mode

You have the option to connect to your runner while it has the status “Starting” or “Running” for debugging purposes. For detailed instructions see [How-to: Enable Debug Mode](/products/ci-engine/how-to/enable-debug-mode.md).

#### Automatic Timeout

* Runners in debug mode will be timed out after 12 hours.
* Runners customizing an Image will be timed out after 12 hours.

### Concurrency

The concurrency limit is the amount of runners which can run in parallel. A subscription has a concurrency limit of one by default.

Be advised that the minimum commitment time for reducing the concurrency limit is 730 hours (\~1 month). You can only reduce your concurrency limit once the commitment time has passed.

#### Changing Concurrency Limit

1. Navigate to the details page of your subscription.
2. Click on the dot-menu of the subscription.
3. Click on “Change limits” in the action menu.
4. Set your “New Concurrency Limit”.


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