You can access parallel preferences in the general preferences for MATLAB. To open the Preferences dialog box, use any one of the following:
On the Home tab in the Environment section, click Parallel > Parallel Preferences
Click the desktop pool indicator icon, and select Parallel preferences.
In the command window, type
In the navigation tree of the Preferences dialog box, click Parallel Computing Toolbox.
The parallel preferences dialog box looks something like this:
You can control the following with your preference settings:
Current Cluster — This is the default on which a pool is opened when you do not otherwise specify a cluster.
Preferred number of workers — This specifies the number of workers to form a pool, if possible. The actual pool size might be limited by licensing, cluster size, and cluster profile settings.
Automatically create a parallel pool — This setting causes a pool to automatically start if one is not already running at the time a parallel language is encountered that runs on a pool, such as:
Shut down and delete a parallel pool — This setting causes a parallel pool to automatically shut down if the pool has been idle for the specified amount of time. Whenever the pool is used (for example, with a parfor or parfeval), the timeout counter is reset. When the timeout is about to expire, a tooltip on the desktop pool indicator warms you, and lets you extend the timeout.