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# requestResidency()

Tells Metal to do as much preparatory work as it can, with the system’s current conditions, to make the set’s resource allocations resident.

```
func requestResidency()
```

## Discussion

Call the method anytime after calling a residency set’s [`commit()`](/documentation/Metal/MTLResidencySet/commit()) method, ideally well before calling the [`commit()`](/documentation/Metal/MTLCommandBuffer/commit()) method of any [`MTLCommandBuffer`](/documentation/Metal/MTLCommandBuffer) that uses it.

The method may postpone some of the necessary steps to make resources resident in scenarios where other apps concurrently need resources in residency.

---

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