darwin: no partial offloading if required memory greater than system

gpu/gpu_darwin.go

@@ -32,6 +32,7 @@ func CheckVRAM() (uint64, error) {
 		// gpu not supported, this may not be metal
 		return 0, nil
 	}
+
 	return uint64(C.getRecommendedMaxVRAM()), nil
 }
 
@@ -52,7 +53,7 @@ func GetGPUInfo() GpuInfo {
 
 func getCPUMem() (memInfo, error) {
 	return memInfo{
-		TotalMemory: 0,
+		TotalMemory: uint64(C.getPhysicalMemory()),
 		FreeMemory:  0,
 		DeviceCount: 0,
 	}, nil

gpu/gpu_info_darwin.h

@@ -1,3 +1,4 @@
 #import <Metal/Metal.h>
 #include <stdint.h>
 uint64_t getRecommendedMaxVRAM();
+uint64_t getPhysicalMemory();

gpu/gpu_info_darwin.m

@@ -1,11 +1,13 @@
-//go:build darwin
+// go:build darwin
 #include "gpu_info_darwin.h"
 
-uint64_t getRecommendedMaxVRAM()
-{
-	id<MTLDevice> device = MTLCreateSystemDefaultDevice();
-	uint64_t result = device.recommendedMaxWorkingSetSize;
-	CFRelease(device);
-	return result;
+uint64_t getRecommendedMaxVRAM() {
+  id<MTLDevice> device = MTLCreateSystemDefaultDevice();
+  uint64_t result = device.recommendedMaxWorkingSetSize;
+  CFRelease(device);
+  return result;
 }
 
+uint64_t getPhysicalMemory() {
+  return [[NSProcessInfo processInfo] physicalMemory];
+}