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# MTLCounterSet

A collection of individual counters a GPU device supports for a counter set.

```
protocol MTLCounterSet : NSObjectProtocol, Sendable
```

## Overview

You can determine which counter sets a GPU supports by checking an [`MTLDevice`](/documentation/Metal/MTLDevice) instance’s [`counterSets`](/documentation/Metal/MTLDevice/counterSets) property. A counter set’s [`name`](/documentation/Metal/MTLCounterSet/name) property typically matches one of the common counter set names that [`MTLCommonCounterSet`](/documentation/Metal/MTLCommonCounterSet) defines. Check whether a GPU device supports a specific counter by comparing elements of the [`counters`](/documentation/Metal/MTLCounterSet/counters) property with a counter’s common name that [`MTLCommonCounter`](/documentation/Metal/MTLCommonCounter) defines.

> Important:
> Some GPUs may only support some of the counters within a counter set.

For more information, see [Confirming which counters and counter sets a GPU supports](/documentation/Metal/confirming-which-counters-and-counter-sets-a-gpu-supports).

## Topics

### Identifying a counter set

[`name`](/documentation/Metal/MTLCounterSet/name)

The name of the GPU’s counter set instance.

### Checking which counters a GPU supports

[`counters`](/documentation/Metal/MTLCounterSet/counters)

An array of the counter instances a GPU device supports.


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