GPU Selectors

Control which GPU device is used with the gpu(...) selector syntax.

---

Prefer vs Force

// Prefer discrete GPU (falls back to any available)
gpu (prefer: discrete) {
    result is A @ B;
}

// Force discrete GPU (error if unavailable)
gpu (force: discrete) {
    result is A @ B;
}

---

Full Selector Form

gpu (policy: GPUPolicy.Prefer, mode: GPUMode.Discrete) {
    result is A + B;
}

---

Selector Options

Key	Values	Description
prefer	discrete, integrated	Prefer a device type, fallback to others
force	discrete, integrated	Require a device type, error if missing
policy	GPUPolicy.Prefer, GPUPolicy.Force	Explicit policy enum
mode / target	GPUMode.Discrete, GPUMode.Integrated	Explicit device enum

---

Without Selector

gpu { } without a selector uses the system default (typically the most powerful available GPU).

---

Next Steps

• Backends — GPU backend priority