---
title: requiredThreadsPerThreadgroup
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtl4tilerenderpipelinedescriptor/requiredthreadsperthreadgroup
---

# requiredThreadsPerThreadgroup

Sets the required number of threads per threadgroup for tile dispatches.

## Declaration

```swift
var requiredThreadsPerThreadgroup: MTLSize { get set }
```

## Discussion

Discussion This value is typically optional, except in the cases where the tile function that tileFunctionDescriptor references uses CooperativeTensors. In this case, you need to provide a non-zero value to this property. Additionally, when you set this value, the threadsPerTile argument of any tile dispatch needs to match it. Setting this value to a size of 0 in every dimension disables this property.