如何获取显卡的GPU占用率和显存占用情况

http://blog.csdn.net/paopaoc/article/details/9093125

在游戏的性能调优过程中，经常会需要获取CPU占用率、IO、显卡GPU占用率等基础性能数据，下面就简述一下获取nvdia显卡GPU占用率的方法。 nvdia 显卡在驱动安装后，可以通过nvapi.dll来获取显卡的相关信息。有关nvdia、AMD显卡sdk的相关资料在它们的网站上均有下载，但貌似非注册开发者可获取到的信息有限。

下面提供一个简单封装了的用来获取显卡信息的c++类，由于代码是根据网上可找到的有限资料写成，难免可能存在错误，如有问题欢迎指出。

 

// KGpuMon.h  源代码
#pragma once

#define MAX_GPU_NUM     4L      // 监控的GPU个数（NVIDIA定义的最多GPU个数是64，这里最多只监控4个）
#define MY_PROCESS_ERROR(Condition) do { if (!(Condition)) goto Exit0; } while (false)

#define MAX_DISPLAY_CARDS               4       // 最多监控4块显卡（暂时应该够了吧）
// 常量定义
#define MAX_PHYSICAL_GPUS               64
#define SHORT_STRING_MAX                64
#define MAX_THERMAL_SENSORS_PER_GPU     3
#define MAX_CLOCKS_PER_GPU              0x120
#define MAX_PSTATES_PER_GPU             8
#define MAX_USAGES_PER_GPU              33
#define MAX_COOLER_PER_GPU              20
#define MAX_MEMORY_VALUES_PER_GPU       5

// 接口ID值
#define ID_NvAPI_Initialize                     0x0150E828
#define ID_NvAPI_GPU_GetFullName                0xCEEE8E9F
#define ID_NvAPI_GPU_GetThermalSettings         0xE3640A56
#define ID_NvAPI_EnumNvidiaDisplayHandle        0x9ABDD40D
#define ID_NvAPI_GetPhysicalGPUsFromDisplay     0x34EF9506
#define ID_NvAPI_EnumPhysicalGPUs               0xE5AC921F
#define ID_NvAPI_GPU_GetTachReading             0x5F608315
#define ID_NvAPI_GPU_GetAllClocks               0x1BD69F49
#define ID_NvAPI_GPU_GetPStates                 0x60DED2ED
#define ID_NvAPI_GPU_GetUsages                  0x189A1FDF
#define ID_NvAPI_GPU_GetCoolerSettings          0xDA141340
#define ID_NvAPI_GPU_SetCoolerLevels            0x891FA0AE
#define ID_NvAPI_GPU_GetMemoryInfo              0x774AA982
#define ID_NvAPI_GetDisplayDriverVersion        0xF951A4D1
#define ID_NvAPI_GetInterfaceVersionString      0x01053FA5
#define ID_NvAPI_GPU_GetPCIIdentifiers          0x2DDFB66E

// 版本号参数定义
#define GPU_THERMAL_SETTINGS_VER                (sizeof(NvGPUThermalSettings) | 0x10000)
#define GPU_CLOCKS_VER                          (sizeof(NvClocks) | 0x20000)
#define GPU_PSTATES_VER                         (sizeof(NvPStates) | 0x10000)
#define GPU_USAGES_VER                          (sizeof(NvUsages) | 0x10000)
#define GPU_COOLER_SETTINGS_VER                 (sizeof(NvGPUCoolerSettings) | 0x20000)
#define GPU_MEMORY_INFO_VER                     (sizeof(NvMemoryInfo) | 0x20000)
#define DISPLAY_DRIVER_VERSION_VER              (sizeof(NvDisplayDriverVersion) | 0x10000)
#define GPU_COOLER_LEVELS_VER                   (sizeof(NvGPUCoolerLevels) | 0x10000)

enum NvStatus
{
    enumNvStatus_OK = 0,
    enumNvStatus_ERROR = -1,
    enumNvStatus_LIBRARY_NOT_FOUND = -2,
    enumNvStatus_NO_IMPLEMENTATION = -3,
    enumNvStatus_API_NOT_INTIALIZED = -4,
    enumNvStatus_INVALID_ARGUMENT = -5,
    enumNvStatus_NVIDIA_DEVICE_NOT_FOUND = -6,
    enumNvStatus_END_ENUMERATION = -7,
    enumNvStatus_INVALID_HANDLE = -8,
    enumNvStatus_INCOMPATIBLE_STRUCT_VERSION = -9,
    enumNvStatus_HANDLE_INVALIDATED = -10,
    enumNvStatus_OPENGL_CONTEXT_NOT_CURRENT = -11,
    enumNvStatus_NO_GL_EXPERT = -12,
    enumNvStatus_INSTRUMENTATION_DISABLED = -13,
    enumNvStatus_EXPECTED_LOGICAL_GPU_HANDLE = -100,
    enumNvStatus_EXPECTED_PHYSICAL_GPU_HANDLE = -101,
    enumNvStatus_EXPECTED_DISPLAY_HANDLE = -102,
    enumNvStatus_INVALID_COMBINATION = -103,
    enumNvStatus_NOT_SUPPORTED = -104,
    enumNvStatus_PORTID_NOT_FOUND = -105,
    enumNvStatus_EXPECTED_UNATTACHED_DISPLAY_HANDLE = -106,
    enumNvStatus_INVALID_PERF_LEVEL = -107,
    enumNvStatus_DEVICE_BUSY = -108,
    enumNvStatus_NV_PERSIST_FILE_NOT_FOUND = -109,
    enumNvStatus_PERSIST_DATA_NOT_FOUND = -110,
    enumNvStatus_EXPECTED_TV_DISPLAY = -111,
    enumNvStatus_EXPECTED_TV_DISPLAY_ON_DCONNECTOR = -112,
    enumNvStatus_NO_ACTIVE_SLI_TOPOLOGY = -113,
    enumNvStatus_SLI_RENDERING_MODE_NOTALLOWED = -114,
    enumNvStatus_EXPECTED_DIGITAL_FLAT_PANEL = -115,
    enumNvStatus_ARGUMENT_EXCEED_MAX_SIZE = -116,
    enumNvStatus_DEVICE_SWITCHING_NOT_ALLOWED = -117,
    enumNvStatus_TESTING_CLOCKS_NOT_SUPPORTED = -118,
    enumNvStatus_UNKNOWN_UNDERSCAN_CONFIG = -119,
    enumNvStatus_TIMEOUT_RECONFIGURING_GPU_TOPO = -120,
    enumNvStatus_DATA_NOT_FOUND = -121,
    enumNvStatus_EXPECTED_ANALOG_DISPLAY = -122,
    enumNvStatus_NO_VIDLINK = -123,
    enumNvStatus_REQUIRES_REBOOT = -124,
    enumNvStatus_INVALID_HYBRID_MODE = -125,
    enumNvStatus_MIXED_TARGET_TYPES = -126,
    enumNvStatus_SYSWOW64_NOT_SUPPORTED = -127,
    enumNvStatus_IMPLICIT_SET_GPU_TOPOLOGY_CHANGE_NOT_ALLOWED = -128,
    enumNvStatus_REQUEST_USER_TO_CLOSE_NON_MIGRATABLE_APPS = -129,
    enumNvStatus_OUT_OF_MEMORY = -130,
    enumNvStatus_WAS_STILL_DRAWING = -131,
    enumNvStatus_FILE_NOT_FOUND = -132,
    enumNvStatus_TOO_MANY_UNIQUE_STATE_OBJECTS = -133,
    enumNvStatus_INVALID_CALL = -134,
    enumNvStatus_D3D10_1_LIBRARY_NOT_FOUND = -135,
    enumNvStatus_FUNCTION_NOT_FOUND = -136
};

enum NvThermalController
{
    enumNvThermalController_NONE = 0,
    enumNvThermalController_GPU_INTERNAL,
    enumNvThermalController_ADM1032,
    enumNvThermalController_MAX6649,
    enumNvThermalController_MAX1617,
    enumNvThermalController_LM99,
    enumNvThermalController_LM89,
    enumNvThermalController_LM64,
    enumNvThermalController_ADT7473,
    enumNvThermalController_SBMAX6649,
    enumNvThermalController_VBIOSEVT,
    enumNvThermalController_OS,
    enumNvThermalController_UNKNOWN = -1,
};

enum NvThermalTarget
{
    enumNvThermalTarget_NONE = 0,
    enumNvThermalTarget_GPU = 1,
    enumNvThermalTarget_MEMORY = 2,
    enumNvThermalTarget_POWER_SUPPLY = 4,
    enumNvThermalTarget_BOARD = 8,
    enumNvThermalTarget_ALL = 15,
    enumNvThermalTarget_UNKNOWN = -1
};

typedef struct _NvSensor
{
    NvThermalController Controller;
    unsigned int DefaultMinTemp;
    unsigned int DefaultMaxTemp;
    unsigned int CurrentTemp;
    NvThermalTarget Target;
}NvSensor;

typedef struct _NvGPUThermalSettings
{
    unsigned int Version;
    unsigned int Count;
    NvSensor Sensor[MAX_THERMAL_SENSORS_PER_GPU];
}NvGPUThermalSettings;

typedef struct _NvClocks
{
    unsigned int Version;
    unsigned int Clock[MAX_CLOCKS_PER_GPU];
}NvClocks;

typedef struct _NvPState
{
    bool Present;
    int Percentage;
}NvPState;

typedef struct _NvPStates
{
    unsigned int Version;
    unsigned int Flags;
    NvPState PStates[MAX_PSTATES_PER_GPU];
}NvPStates;

typedef struct _NvUsages
{
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