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# MTLIOCommandQueueType

Designates the queue type for a new input/output command queue.

```
enum MTLIOCommandQueueType
```

## Topics

### I/O command queue types

[`MTLIOCommandQueueType.concurrent`](/documentation/Metal/MTLIOCommandQueueType/concurrent)

Sets a new input/output command queue’s type to a queue that runs commands concurrently.

[`MTLIOCommandQueueType.serial`](/documentation/Metal/MTLIOCommandQueueType/serial)

Sets a new input/output command queue’s type to a queue that runs commands serially.


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