# cpu

Require the CPU compute route with [cpu]. The current source developer example selects --backend cpu-oracle explicitly.

Last updated: 2026-09-09

Package: runtime | Status: experimental

Tags: compute, cpu, gameplay, gpu, yeho

CPU and GPU data processing with explicit ownership and completion.

```yh
cpu
```


## CPU · [cpu]

Apply damage to a small batch of health values on the explicit CPU route. Each invocation owns one element.

Verification: executed

```yh
[cpu]
compute ApplyDamage(buffer of int health, int damage)
{
    int index = compute.index
    if index >= health.count { return }
    health[index] = health[index] - damage
}

buffer of int health
health.Add(100)
health.Add(80)
health.Add(60)
computeTask job = dispatch ApplyDamage(health, 10)
wait job
if job.failed { Console.Error(job.error.message) Process.Exit(1) }
for index from 0 < health.count { Console.Log(Text.From(health[index])) }

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.tag__cpu"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

```

Expected output:

```text
90
70
50
```

Executed backend: cpu-oracle

Observed output:

```text
90
70
50
```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/tag--cpu/cpu --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```




Source: yeho/docs/runtime/execution-boundaries.md; docs/runtime/metal-compute-v1.md

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