main-gpu argument is not getting passed to llamacpp, fixed. (#1192)

llm/llama.go

@@ -339,6 +339,7 @@ func newLlama(model string, adapters []string, runners []ModelRunner, numLayers
 		"--model", model,
 		"--ctx-size", fmt.Sprintf("%d", opts.NumCtx),
 		"--batch-size", fmt.Sprintf("%d", opts.NumBatch),
+		"--main-gpu", fmt.Sprintf("%d", opts.MainGPU),
 		"--n-gpu-layers", fmt.Sprintf("%d", numGPU),
 		"--embedding",
 	}
@@ -544,6 +545,7 @@ func (llm *llama) Predict(ctx context.Context, prevContext []int, prompt string,
 		"stream":            true,
 		"n_predict":         llm.NumPredict,
 		"n_keep":            llm.NumKeep,
+		"main_gpu":          llm.MainGPU,
 		"temperature":       llm.Temperature,
 		"top_k":             llm.TopK,
 		"top_p":             llm.TopP,