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# MTLResidencySetDescriptor

A configuration that customizes the behavior for a residency set.

```
class MTLResidencySetDescriptor
```

## Overview

Make an [`MTLResidencySet`](/documentation/Metal/MTLResidencySet) by creating and configuring an [`MTLResidencySetDescriptor`](/documentation/Metal/MTLResidencySetDescriptor) instance and pass it to the [`makeResidencySet(descriptor:)`](/documentation/Metal/MTLDevice/makeResidencySet(descriptor:)) method of an [`MTLDevice`](/documentation/Metal/MTLDevice) instance.

See [Simplifying GPU resource management with residency sets](/documentation/Metal/simplifying-gpu-resource-management-with-residency-sets) for more information.

## Topics

### Configuring the residency set

[`label`](/documentation/Metal/MTLResidencySetDescriptor/label)

An optional name that can help you identify a residency set you create with the descriptor.

[`initialCapacity`](/documentation/Metal/MTLResidencySetDescriptor/initialCapacity)

The number of allocations a new residency set can store without reallocating memory.


---

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