---
title: "Companion"
sidebar_label: "Companion"
description: "Kotlin binding reference: Companion."
---
//[clika-runtime](../../../../index.md)/[io.clika.runtime](../../index.md)/[Device](../index.md)/[Companion](index.md)
# Companion
[common]\
object [Companion](index.md)
## Properties
| Name | Summary |
|---|---|
| [CPU](CPU-property.md) | [common]
val [CPU](CPU-property.md): [Device](../index.md)
The whole-machine host CPU. |
| [WHOLE_MACHINE](WHOLE_MACHINE.md) | [common]
const val [WHOLE_MACHINE](WHOLE_MACHINE.md): [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)
The CPU index naming the whole machine: every core, over memory the OS places on first touch. |
## Functions
| Name | Summary |
|---|---|
| [cpu](cpu.md) | [common]
fun [cpu](cpu.md)(socket: [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) = WHOLE_MACHINE): [Device](../index.md)
`cpu()` is every core; `cpu(i)` is socket `i`. |
| [cuda](cuda.md) | [common]
fun [cuda](cuda.md)(index: [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) = 0): [Device](../index.md)
The `index`-th CUDA device. |
| [gpu](gpu.md) | [common]
fun [gpu](gpu.md)(index: [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) = 0): [Device](../index.md)
The generic accelerator: the first GPU backend that loads and exposes a device on this host, else the CPU (said once at warning level on the runtime's log channel). |
| [htp](htp.md) | [common]
fun [htp](htp.md)(index: [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) = 0): [Device](../index.md)
The `index`-th HTP device. |
| [metal](metal.md) | [common]
fun [metal](metal.md)(index: [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) = 0): [Device](../index.md)
The `index`-th Metal device. |
| [parse](parse.md) | [common]
fun [parse](parse.md)(text: [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)): [Device](../index.md)
Parse `"cpu"`, `"gpu"`, `"cuda"`, `"cuda:1"`, `"vulkan:0"`, `"metal"`, `"htp"` or `"tpu"` (case-insensitive; an absent index means the backend's default device). |
| [tpu](tpu.md) | [common]
fun [tpu](tpu.md)(index: [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) = 0): [Device](../index.md)
The `index`-th TPU device. |
| [vulkan](vulkan.md) | [common]
fun [vulkan](vulkan.md)(index: [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) = 0): [Device](../index.md)
The `index`-th Vulkan device. |