Fix windows system memory lookup

This refines the gpu package error handling and fixes a bug with the
system memory lookup on windows.

gpu/gpu.go

@@ -66,7 +66,7 @@ func GetGPUInfo() GpuInfo {
 	}
 
 	var memInfo C.mem_info_t
-	resp := GpuInfo{"", 0, 0}
+	resp := GpuInfo{}
 	if gpuHandles.cuda != nil {
 		C.cuda_check_vram(*gpuHandles.cuda, &memInfo)
 		if memInfo.err != nil {
@@ -103,6 +103,19 @@ func GetGPUInfo() GpuInfo {
 	return resp
 }
 
+func getCPUMem() (memInfo, error) {
+	var ret memInfo
+	var info C.mem_info_t
+	C.cpu_check_ram(&info)
+	if info.err != nil {
+		defer C.free(unsafe.Pointer(info.err))
+		return ret, fmt.Errorf(C.GoString(info.err))
+	}
+	ret.FreeMemory = uint64(info.free)
+	ret.TotalMemory = uint64(info.total)
+	return ret, nil
+}
+
 func CheckVRAM() (int64, error) {
 	gpuInfo := GetGPUInfo()
 	if gpuInfo.FreeMemory > 0 && (gpuInfo.Library == "cuda" || gpuInfo.Library == "rocm") {

gpu/gpu_darwin.go

@@ -18,12 +18,18 @@ func CheckVRAM() (int64, error) {
 
 func GetGPUInfo() GpuInfo {
 	// TODO - Metal vs. x86 macs...
-
+	mem, _ := getCPUMem()
 	return GpuInfo{
-		Library:     "default",
+		Library: "default",
+		memInfo: mem,
+	}
+}
+
+func getCPUMem() (memInfo, error) {
+	return memInfo{
 		TotalMemory: 0,
 		FreeMemory:  0,
-	}
+	}, nil
 }
 
 func NumGPU(numLayer, fileSizeBytes int64, opts api.Options) int {

gpu/gpu_info.h

@@ -9,20 +9,21 @@
 #include <dlfcn.h>
 #define LOAD_LIBRARY(lib, flags) dlopen(lib, flags)
 #define LOAD_SYMBOL(handle, sym) dlsym(handle, sym)
-#define LOAD_ERR() dlerror()
+#define LOAD_ERR() strdup(dlerror())
 #define UNLOAD_LIBRARY(handle) dlclose(handle)
 #else
 #include <windows.h>
 #define LOAD_LIBRARY(lib, flags) LoadLibrary(lib)
 #define LOAD_SYMBOL(handle, sym) GetProcAddress(handle, sym)
 #define UNLOAD_LIBRARY(handle) FreeLibrary(handle)
-
-// TODO - refactor this with proper error message handling on windows
-inline static char *LOAD_ERR() {
-  static char errbuf[8];
-  snprintf(errbuf, 8, "0x%lx", GetLastError());
-  return errbuf;
-}
+#define LOAD_ERR() ({\
+  LPSTR messageBuffer = NULL; \
+  size_t size = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, \
+                                 NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&messageBuffer, 0, NULL); \
+  char *resp = strdup(messageBuffer); \
+  LocalFree(messageBuffer); \
+  resp; \
+})
 
 #endif
 

gpu/gpu_info_cpu.c

@@ -6,11 +6,12 @@
 void cpu_check_ram(mem_info_t *resp) {
   resp->err = NULL;
   MEMORYSTATUSEX info;
+  info.dwLength = sizeof(info);
   if (GlobalMemoryStatusEx(&info) != 0) {
     resp->total = info.ullTotalPhys;
     resp->free = info.ullAvailPhys;
   } else {
-    resp->err = strdup(LOAD_ERR());
+    resp->err = LOAD_ERR();
   }
   return;
 }

gpu/gpu_info_cuda.c

@@ -43,9 +43,11 @@ void cuda_init(cuda_init_resp_t *resp) {
   if (!resp->ch.handle) {
     // TODO improve error message, as the LOAD_ERR will have typically have the
     // final path that was checked which might be confusing.
+    char *msg = LOAD_ERR();
     snprintf(buf, buflen,
              "Unable to load %s library to query for Nvidia GPUs: %s",
-             cuda_lib_paths[0], LOAD_ERR());
+             cuda_lib_paths[0], msg);
+    free(msg);
     resp->err = strdup(buf);
     return;
   }
@@ -55,8 +57,10 @@ void cuda_init(cuda_init_resp_t *resp) {
     if (!l[i].p) {
       UNLOAD_LIBRARY(resp->ch.handle);
       resp->ch.handle = NULL;
+      char *msg = LOAD_ERR();
       snprintf(buf, buflen, "symbol lookup for %s failed: %s", l[i].s,
-               LOAD_ERR());
+               msg);
+      free(msg);
       resp->err = strdup(buf);
       return;
     }

gpu/gpu_info_rocm.c

@@ -40,9 +40,11 @@ void rocm_init(rocm_init_resp_t *resp) {
     resp->rh.handle = LOAD_LIBRARY(rocm_lib_paths[i], RTLD_LAZY);
   }
   if (!resp->rh.handle) {
+    char *msg = LOAD_ERR();
     snprintf(buf, buflen,
              "Unable to load %s library to query for Radeon GPUs: %s\n",
-             rocm_lib_paths[0], LOAD_ERR());
+             rocm_lib_paths[0], msg);
+    free(msg);
     resp->err = strdup(buf);
     return;
   }
@@ -51,8 +53,10 @@ void rocm_init(rocm_init_resp_t *resp) {
     *l[i].p = LOAD_SYMBOL(resp->rh.handle, l[i].s);
     if (!l[i].p) {
       UNLOAD_LIBRARY(resp->rh.handle);
+      char *msg = LOAD_ERR();
       snprintf(buf, buflen, "symbol lookup for %s failed: %s", l[i].s,
-               LOAD_ERR());
+               msg);
+      free(msg);
       resp->err = strdup(buf);
       return;
     }

gpu/gpu_test.go

@@ -23,4 +23,19 @@ func TestBasicGetGPUInfo(t *testing.T) {
 	}
 }
 
+func TestCPUMemInfo(t *testing.T) {
+	info, err := getCPUMem()
+	assert.NoError(t, err)
+	switch runtime.GOOS {
+	case "darwin":
+		t.Skip("CPU memory not populated on darwin")
+	case "linux", "windows":
+		assert.Greater(t, info.TotalMemory, uint64(0))
+		assert.Greater(t, info.FreeMemory, uint64(0))
+	default:
+		return
+	}
+
+}
+
 // TODO - add some logic to figure out card type through other means and actually verify we got back what we expected

gpu/types.go

@@ -1,10 +1,14 @@
 package gpu
 
+type memInfo struct {
+	TotalMemory uint64 `json:"total_memory,omitempty"`
+	FreeMemory  uint64 `json:"free_memory,omitempty"`
+}
+
 // Beginning of an `ollama info` command
 type GpuInfo struct {
-	Library     string `json:"library,omitempty"`
-	TotalMemory uint64 `json:"total_memory,omitempty"`
-	FreeMemory  uint64 `json:"free_memory,omitempty"`
+	memInfo
+	Library string `json:"library,omitempty"`
 
 	// TODO add other useful attributes about the card here for discovery information
 }