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375 lines
11 KiB
ReStructuredText
375 lines
11 KiB
ReStructuredText
Initalization and Information
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=============================
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.. highlight:: cpp
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gpu::getCudaEnabledDeviceCount
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------------------------------
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Returns the number of installed CUDA-enabled devices.
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.. ocv:function:: int gpu::getCudaEnabledDeviceCount()
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Use this function before any other GPU functions calls. If OpenCV is compiled without GPU support, this function returns 0.
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gpu::setDevice
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--------------
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Sets a device and initializes it for the current thread.
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.. ocv:function:: void gpu::setDevice(int device)
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:param device: System index of a GPU device starting with 0.
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If the call of this function is omitted, a default device is initialized at the fist GPU usage.
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gpu::getDevice
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--------------
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Returns the current device index set by :ocv:func:`gpu::setDevice` or initialized by default.
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.. ocv:function:: int gpu::getDevice()
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gpu::resetDevice
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----------------
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Explicitly destroys and cleans up all resources associated with the current device in the current process.
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.. ocv:function:: void gpu::resetDevice()
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Any subsequent API call to this device will reinitialize the device.
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gpu::FeatureSet
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---------------
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Enumeration providing GPU computing features.
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.. ocv:enum:: gpu::FeatureSet
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.. ocv:emember:: FEATURE_SET_COMPUTE_10
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.. ocv:emember:: FEATURE_SET_COMPUTE_11
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.. ocv:emember:: FEATURE_SET_COMPUTE_12
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.. ocv:emember:: FEATURE_SET_COMPUTE_13
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.. ocv:emember:: FEATURE_SET_COMPUTE_20
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.. ocv:emember:: FEATURE_SET_COMPUTE_21
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.. ocv:emember:: GLOBAL_ATOMICS
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.. ocv:emember:: SHARED_ATOMICS
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.. ocv:emember:: NATIVE_DOUBLE
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gpu::TargetArchs
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----------------
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.. ocv:class:: gpu::TargetArchs
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Class providing a set of static methods to check what NVIDIA* card architecture the GPU module was built for.
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The following method checks whether the module was built with the support of the given feature:
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.. ocv:function:: static bool gpu::TargetArchs::builtWith( FeatureSet feature_set )
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:param feature_set: Features to be checked. See :ocv:enum:`gpu::FeatureSet`.
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There is a set of methods to check whether the module contains intermediate (PTX) or binary GPU code for the given architecture(s):
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.. ocv:function:: static bool gpu::TargetArchs::has(int major, int minor)
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.. ocv:function:: static bool gpu::TargetArchs::hasPtx(int major, int minor)
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.. ocv:function:: static bool gpu::TargetArchs::hasBin(int major, int minor)
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.. ocv:function:: static bool gpu::TargetArchs::hasEqualOrLessPtx(int major, int minor)
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.. ocv:function:: static bool gpu::TargetArchs::hasEqualOrGreater(int major, int minor)
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.. ocv:function:: static bool gpu::TargetArchs::hasEqualOrGreaterPtx(int major, int minor)
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.. ocv:function:: static bool gpu::TargetArchs::hasEqualOrGreaterBin(int major, int minor)
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:param major: Major compute capability version.
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:param minor: Minor compute capability version.
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According to the CUDA C Programming Guide Version 3.2: "PTX code produced for some specific compute capability can always be compiled to binary code of greater or equal compute capability".
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gpu::DeviceInfo
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---------------
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.. ocv:class:: gpu::DeviceInfo
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Class providing functionality for querying the specified GPU properties. ::
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class CV_EXPORTS DeviceInfo
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{
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public:
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//! creates DeviceInfo object for the current GPU
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DeviceInfo();
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//! creates DeviceInfo object for the given GPU
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DeviceInfo(int device_id);
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//! ASCII string identifying device
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const char* name() const;
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//! global memory available on device in bytes
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size_t totalGlobalMem() const;
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//! shared memory available per block in bytes
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size_t sharedMemPerBlock() const;
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//! 32-bit registers available per block
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int regsPerBlock() const;
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//! warp size in threads
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int warpSize() const;
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//! maximum pitch in bytes allowed by memory copies
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size_t memPitch() const;
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//! maximum number of threads per block
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int maxThreadsPerBlock() const;
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//! maximum size of each dimension of a block
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Vec3i maxThreadsDim() const;
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//! maximum size of each dimension of a grid
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Vec3i maxGridSize() const;
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//! clock frequency in kilohertz
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int clockRate() const;
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//! constant memory available on device in bytes
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size_t totalConstMem() const;
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//! major compute capability
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int major() const;
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//! minor compute capability
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int minor() const;
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//! alignment requirement for textures
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size_t textureAlignment() const;
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//! pitch alignment requirement for texture references bound to pitched memory
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size_t texturePitchAlignment() const;
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//! number of multiprocessors on device
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int multiProcessorCount() const;
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//! specified whether there is a run time limit on kernels
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bool kernelExecTimeoutEnabled() const;
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//! device is integrated as opposed to discrete
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bool integrated() const;
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//! device can map host memory with cudaHostAlloc/cudaHostGetDevicePointer
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bool canMapHostMemory() const;
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enum ComputeMode
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{
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ComputeModeDefault, /**< default compute mode (Multiple threads can use ::cudaSetDevice() with this device) */
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ComputeModeExclusive, /**< compute-exclusive-thread mode (Only one thread in one process will be able to use ::cudaSetDevice() with this device) */
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ComputeModeProhibited, /**< compute-prohibited mode (No threads can use ::cudaSetDevice() with this device) */
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ComputeModeExclusiveProcess /**< compute-exclusive-process mode (Many threads in one process will be able to use ::cudaSetDevice() with this device) */
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};
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//! compute mode
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ComputeMode computeMode() const;
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//! maximum 1D texture size
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int maxTexture1D() const;
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//! maximum 1D mipmapped texture size
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int maxTexture1DMipmap() const;
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//! maximum size for 1D textures bound to linear memory
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int maxTexture1DLinear() const;
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//! maximum 2D texture dimensions
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Vec2i maxTexture2D() const;
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//! maximum 2D mipmapped texture dimensions
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Vec2i maxTexture2DMipmap() const;
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//! maximum dimensions (width, height, pitch) for 2D textures bound to pitched memory
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Vec3i maxTexture2DLinear() const;
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//! maximum 2D texture dimensions if texture gather operations have to be performed
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Vec2i maxTexture2DGather() const;
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//! maximum 3D texture dimensions
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Vec3i maxTexture3D() const;
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//! maximum Cubemap texture dimensions
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int maxTextureCubemap() const;
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//! maximum 1D layered texture dimensions
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Vec2i maxTexture1DLayered() const;
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//! maximum 2D layered texture dimensions
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Vec3i maxTexture2DLayered() const;
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//! maximum Cubemap layered texture dimensions
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Vec2i maxTextureCubemapLayered() const;
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//! maximum 1D surface size
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int maxSurface1D() const;
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//! maximum 2D surface dimensions
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Vec2i maxSurface2D() const;
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//! maximum 3D surface dimensions
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Vec3i maxSurface3D() const;
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//! maximum 1D layered surface dimensions
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Vec2i maxSurface1DLayered() const;
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//! maximum 2D layered surface dimensions
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Vec3i maxSurface2DLayered() const;
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//! maximum Cubemap surface dimensions
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int maxSurfaceCubemap() const;
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//! maximum Cubemap layered surface dimensions
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Vec2i maxSurfaceCubemapLayered() const;
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//! alignment requirements for surfaces
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size_t surfaceAlignment() const;
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//! device can possibly execute multiple kernels concurrently
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bool concurrentKernels() const;
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//! device has ECC support enabled
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bool ECCEnabled() const;
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//! PCI bus ID of the device
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int pciBusID() const;
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//! PCI device ID of the device
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int pciDeviceID() const;
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//! PCI domain ID of the device
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int pciDomainID() const;
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//! true if device is a Tesla device using TCC driver, false otherwise
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bool tccDriver() const;
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//! number of asynchronous engines
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int asyncEngineCount() const;
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//! device shares a unified address space with the host
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bool unifiedAddressing() const;
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//! peak memory clock frequency in kilohertz
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int memoryClockRate() const;
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//! global memory bus width in bits
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int memoryBusWidth() const;
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//! size of L2 cache in bytes
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int l2CacheSize() const;
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//! maximum resident threads per multiprocessor
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int maxThreadsPerMultiProcessor() const;
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//! gets free and total device memory
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void queryMemory(size_t& totalMemory, size_t& freeMemory) const;
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size_t freeMemory() const;
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size_t totalMemory() const;
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//! checks whether device supports the given feature
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bool supports(FeatureSet feature_set) const;
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//! checks whether the GPU module can be run on the given device
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bool isCompatible() const;
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};
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gpu::DeviceInfo::DeviceInfo
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---------------------------
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The constructors.
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.. ocv:function:: gpu::DeviceInfo::DeviceInfo()
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.. ocv:function:: gpu::DeviceInfo::DeviceInfo(int device_id)
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:param device_id: System index of the GPU device starting with 0.
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Constructs the ``DeviceInfo`` object for the specified device. If ``device_id`` parameter is missed, it constructs an object for the current device.
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gpu::DeviceInfo::name
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---------------------
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Returns the device name.
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.. ocv:function:: const char* gpu::DeviceInfo::name() const
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gpu::DeviceInfo::major
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----------------------
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Returns the major compute capability version.
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.. ocv:function:: int gpu::DeviceInfo::major()
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gpu::DeviceInfo::minor
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----------------------
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Returns the minor compute capability version.
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.. ocv:function:: int gpu::DeviceInfo::minor()
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gpu::DeviceInfo::freeMemory
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---------------------------
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Returns the amount of free memory in bytes.
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.. ocv:function:: size_t gpu::DeviceInfo::freeMemory()
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gpu::DeviceInfo::totalMemory
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----------------------------
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Returns the amount of total memory in bytes.
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.. ocv:function:: size_t gpu::DeviceInfo::totalMemory()
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gpu::DeviceInfo::supports
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-------------------------
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Provides information on GPU feature support.
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.. ocv:function:: bool gpu::DeviceInfo::supports(FeatureSet feature_set) const
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:param feature_set: Features to be checked. See :ocv:enum:`gpu::FeatureSet`.
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This function returns ``true`` if the device has the specified GPU feature. Otherwise, it returns ``false`` .
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gpu::DeviceInfo::isCompatible
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-----------------------------
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Checks the GPU module and device compatibility.
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.. ocv:function:: bool gpu::DeviceInfo::isCompatible()
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This function returns ``true`` if the GPU module can be run on the specified device. Otherwise, it returns ``false`` .
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gpu::DeviceInfo::deviceID
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-------------------------
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Returns system index of the GPU device starting with 0.
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.. ocv:function:: int gpu::DeviceInfo::deviceID()
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