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224 lines
5.7 KiB
ReStructuredText
224 lines
5.7 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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.. ocv:class:: gpu::FeatureSet
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Class providing GPU computing features. ::
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enum FeatureSet
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{
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FEATURE_SET_COMPUTE_10,
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FEATURE_SET_COMPUTE_11,
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FEATURE_SET_COMPUTE_12,
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FEATURE_SET_COMPUTE_13,
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FEATURE_SET_COMPUTE_20,
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FEATURE_SET_COMPUTE_21,
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GLOBAL_ATOMICS,
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SHARED_ATOMICS,
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NATIVE_DOUBLE
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};
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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)
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:param feature: Feature to be checked. See :ocv:class:`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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DeviceInfo();
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DeviceInfo(int device_id);
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string name() const;
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int majorVersion() const;
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int minorVersion() const;
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int multiProcessorCount() const;
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size_t freeMemory() const;
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size_t totalMemory() const;
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bool supports(FeatureSet feature) const;
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bool isCompatible() const;
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int deviceID() 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:: string gpu::DeviceInfo::name()
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gpu::DeviceInfo::majorVersion
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---------------------------------
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Returns the major compute capability version.
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.. ocv:function:: int gpu::DeviceInfo::majorVersion()
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gpu::DeviceInfo::minorVersion
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---------------------------------
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Returns the minor compute capability version.
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.. ocv:function:: int gpu::DeviceInfo::minorVersion()
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gpu::DeviceInfo::multiProcessorCount
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----------------------------------------
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Returns the number of streaming multiprocessors.
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.. ocv:function:: int gpu::DeviceInfo::multiProcessorCount()
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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)
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:param feature: Feature to be checked. See :ocv:class:`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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