refactor memory check

llm/llm.go

@@ -58,38 +58,27 @@ func New(workDir, model string, adapters []string, opts api.Options) (LLM, error
 		}
 	}
 
-	totalResidentMemory := memory.TotalMemory()
+	var requiredMemory int64
+	var f16Multiplier int64 = 2
+	totalResidentMemory := int64(memory.TotalMemory())
 	switch ggml.ModelType() {
 	case "3B", "7B":
-		if ggml.FileType() == "F16" && totalResidentMemory < 16*format.GigaByte {
-			return nil, fmt.Errorf("F16 model requires at least 16 GB of memory")
-		} else if totalResidentMemory < 8*format.GigaByte {
-			return nil, fmt.Errorf("model requires at least 8 GB of memory")
-		}
+		requiredMemory = 8 * format.GigaByte
 	case "13B":
-		if ggml.FileType() == "F16" && totalResidentMemory < 32*format.GigaByte {
-			return nil, fmt.Errorf("F16 model requires at least 32 GB of memory")
-		} else if totalResidentMemory < 16*format.GigaByte {
-			return nil, fmt.Errorf("model requires at least 16 GB of memory")
-		}
+		requiredMemory = 16 * format.GigaByte
 	case "30B", "34B", "40B":
-		if ggml.FileType() == "F16" && totalResidentMemory < 64*format.GigaByte {
-			return nil, fmt.Errorf("F16 model requires at least 64 GB of memory")
-		} else if totalResidentMemory < 32*format.GigaByte {
-			return nil, fmt.Errorf("model requires at least 32 GB of memory")
-		}
+		requiredMemory = 32 * format.GigaByte
 	case "65B", "70B":
-		if ggml.FileType() == "F16" && totalResidentMemory < 128*format.GigaByte {
-			return nil, fmt.Errorf("F16 model requires at least 128 GB of memory")
-		} else if totalResidentMemory < 64*format.GigaByte {
-			return nil, fmt.Errorf("model requires at least 64 GB of memory")
-		}
+		requiredMemory = 64 * format.GigaByte
 	case "180B":
-		if ggml.FileType() == "F16" && totalResidentMemory < 512*format.GigaByte {
-			return nil, fmt.Errorf("F16 model requires at least 512GB of memory")
-		} else if totalResidentMemory < 128*format.GigaByte {
-			return nil, fmt.Errorf("model requires at least 128GB of memory")
-		}
+		requiredMemory = 128 * format.GigaByte
+		f16Multiplier = 4
+	}
+
+	if ggml.FileType() == "F16" && requiredMemory*f16Multiplier > totalResidentMemory {
+		return nil, fmt.Errorf("F16 model requires at least %s of memory", format.HumanBytes(requiredMemory))
+	} else if requiredMemory > totalResidentMemory {
+		return nil, fmt.Errorf("model requires at least %s of memory", format.HumanBytes(requiredMemory))
 	}
 
 	switch ggml.Name() {