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feat(llm): add QMD_FORCE_CUDA env var to disable Vulkan offloading #338

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feat(llm): add QMD_FORCE_CUDA env var to disable Vulkan offloading #338

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17 changes: 15 additions & 2 deletions src/llm.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -545,10 +545,23 @@ export class LlamaCpp implements LLM {
*/
private async ensureLlama(): Promise<Llama> {
if (!this.llama) {
// QMD_FORCE_CPU=1 forces CPU-only mode (useful for older GPUs like Pascal)
// QMD_FORCE_CUDA=1 forces CUDA and disables Vulkan offloading
const forceCpu = process.env.QMD_FORCE_CPU === "1" || process.env.QMD_FORCE_CPU === "true";
const forceCuda = process.env.QMD_FORCE_CUDA === "1" || process.env.QMD_FORCE_CUDA === "true";

let gpuSetting: "auto" | "cuda" | false = "auto";
if (forceCpu) {
gpuSetting = false;
} else if (forceCuda) {
gpuSetting = "cuda";
}

const llama = await getLlama({
// attempt to build
build: "autoAttempt",
logLevel: LlamaLogLevel.error
build: "autoAttempt" as any,
logLevel: LlamaLogLevel.error,
gpu: gpuSetting,
});

if (llama.gpu === false) {
Expand Down