# Use the Computation tool

Use the Computation tool to manage kernels, machines, and notebook runs from one place. This is an alternative option to performing the same operations using Kernel and Run under the main menu.

Procedure: Procedure

1. Open the tab by clicking the ![Computation](https://resources.jetbrains.com.cn/help/img/datalore/2026.3/computation.svg)Computation icon on the left-hand sidebar or selecting the Computation option from the command palette.

When opened, the tab looks as shown in the image below.

![Computation tool](https://resources.jetbrains.com.cn/help/img/datalore/2026.3/computation_tab.png)

2. (Optional) Drag the items on the tab to re-arrange them.

3. The ![Computation](https://resources.jetbrains.com.cn/help/img/datalore/2026.3/computation.svg)Computation tab provides the following options:

* Under Cells: | Option | Description | | --- | --- | | ![Run](https://resources.jetbrains.com.cn/help/img/datalore/2026.3/run.svg)Run all | Runs the entire notebook. | | ![Selected cells](https://resources.jetbrains.com.cn/help/img/datalore/2026.3/selected-cells.svg)Run selected | Runs selected cells. To select several cells in the editor, press `Escape` (Windows), `Escape` (macOS), hold down `Shift` (Windows), `⇧` (macOS), and press `Up` (Windows), `↑` (macOS) or `Down` (Windows), `↓` (macOS). | | ![Bin](https://resources.jetbrains.com.cn/help/img/datalore/2026.3/bin.svg)Clear outputs | Clears outputs in all notebook cells. |

* Under Machine: | Option | Description | | --- | --- | | Only on-demand machines | Enable or disables selection of only [on-demand machines](machine-options.html#spot-and-on-demand-machines) for notebook computations. Recommended when you expect to have long computations and want to make sure they are not interrupted. > **Note: Feature restriction** > In the cloud version of Datalore, this feature is NOT available to Cloud Free plan users. Find the upgrade procedure in [this topic](upgrade-to-cloud-plan.html). > **Note:** > If you make changes to this setting after publishing the report for this notebook, [update the report](update-a-report.html#update-a-report) to make it inherit the new setting. | | Machine selection | Changes the machine. Click the arrow next to the machine name and select an option from the menu. Confirm the machine change. | | Machine start/stop | Starts or stops the machine. | | Background computation | Activates [background computation](background-computation.html) and allows to choose a cut-off timer option. > **Note: Feature restriction** > In the cloud version of Datalore, this feature is NOT available to Cloud Free plan users. Find the upgrade procedure in [this topic](upgrade-to-cloud-plan.html). |

* Under Credit status: | Option | Description | | Manage subscription | Open the JetBrains Account settings for license management. | | Low balance alerts | Opens the dialog for setting up low Datalore credits [balance notifications](use-datalore-credits.html#manage-low-balance-alerts). | | Top up credits | Opens the store page where you can purchase Datalore credits. | | Billing page | Opens the Billing tab of Account settings. | | Pricing info | Open the doc page with the full list of available paid machines. | > **Note:** > For more details about Datalore credits, see [this topic](use-datalore-credits.html). > **Note: Feature restriction** > This feature is NOT available to Cloud Free plan users. Find the upgrade procedure in [this topic](upgrade-to-cloud-plan.html).

* Under Kernel: | Option | Description | | --- | --- | | Interrupt/Restart | Interrupts or restarts the kernel. The options are enabled only when there is a running computation. | | Reactive mode | Turns on the [Reactive mode](use-reactive-mode.html). |

* Under Background computation: | Option | Description | | --- | --- | | Disabled | Keeps background computation off. | | Turn off after 30 min of inactivity | Enables background computation and sets the machine to shut down after the kernel is in idle state for 30 minutes. | | Turn off after 2 hours of inactivity | Enables background computation and sets the machine to shut down after the kernel is in idle state for 2 hours. | | Turn off after 24 hours of inactivity | Enables background computation and sets the machine to shut down after the kernel is in idle state for 24 hours. | | Never turn off | Enable the mode without time restrictions. The machine keeps running even after the computation is finished or an error occurs. |

* Under Scheduled runs: | Option | Description | | --- | --- | | Scheduling is on/off | Turns on or off [scheduled running](scheduling.html) for the notebook if there is a schedule created. | | Scheduled settings | Click to edit the schedule for the notebook. | | Create schedule | Opens the schedule dialog where you can schedule runs for the notebook. Find more details in [Schedule notebook runs](scheduling.html). |

## Keywords

computation management, manage computations, computation control, computation tool