# ComputeCapacity
<a name="API_ComputeCapacity"></a>

Describes the capacity for a fleet.

## Contents
<a name="API_ComputeCapacity_Contents"></a>

 ** DesiredInstances **   <a name="WorkSpacesApplications-Type-ComputeCapacity-DesiredInstances"></a>
The desired number of streaming instances.  
Type: Integer  
Required: No

 ** DesiredSessions **   <a name="WorkSpacesApplications-Type-ComputeCapacity-DesiredSessions"></a>
The desired number of user sessions for a multi-session fleet. This is not allowed for single-session fleets.  
When you create a fleet, you must set either the DesiredSessions or DesiredInstances attribute, based on the type of fleet you create. You can’t define both attributes or leave both attributes blank.  
Type: Integer  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/appstream-2016-12-01/ComputeCapacity) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/appstream-2016-12-01/ComputeCapacity) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/appstream-2016-12-01/ComputeCapacity)