Force a re-installation if EnableInferenceGPUVariant has changed

Signed-off-by: Dorin Geman <dorin.geman@docker.com>

pkg/inference/backends/llamacpp/download.go

@@ -23,6 +23,8 @@ const (
 	hubRepo      = "docker-model-backend-llamacpp"
 )
 
+var ShouldUseGPUVariant bool
+
 func downloadLatestLlamaCpp(ctx context.Context, log logging.Logger, httpClient *http.Client,
 	llamaCppPath, vendoredServerStoragePath, desiredVersion, desiredVariant string,
 ) error {

pkg/inference/backends/llamacpp/download_windows.go

@@ -13,10 +13,14 @@ func ensureLatestLlamaCpp(ctx context.Context, log logging.Logger, httpClient *h
 	llamaCppPath, vendoredServerStoragePath string,
 ) error {
 	nvGPUInfoBin := filepath.Join(vendoredServerStoragePath, "com.docker.nv-gpu-info.exe")
-	canUseCUDA11, err := hasCUDA11CapableGPU(ctx, nvGPUInfoBin)
+	var canUseCUDA11 bool
+	var err error
+	if ShouldUseGPUVariant {
+		canUseCUDA11, err = hasCUDA11CapableGPU(ctx, nvGPUInfoBin)
 		if err != nil {
 			return fmt.Errorf("failed to check CUDA 11 capability: %w", err)
 		}
+	}
 	desiredVersion := "latest"
 	desiredVariant := "cpu"
 	if canUseCUDA11 {

pkg/inference/scheduling/scheduler.go

@@ -196,6 +196,10 @@ func (s *Scheduler) handleOpenAIInference(w http.ResponseWriter, r *http.Request
 	runner.ServeHTTP(w, upstreamRequest)
 }
 
+func (s *Scheduler) ResetInstaller(httpClient *http.Client) {
+	s.installer = newInstaller(s.log, s.backends, httpClient)
+}
+
 // ServeHTTP implements net/http.Handler.ServeHTTP.
 func (s *Scheduler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	s.router.ServeHTTP(w, r)