CUDART_HIGHLEVEL (3)

NAME

C++ API Routines - C++-style interface built on top of CUDA runtime API.

Data Structures

class __cudaOccupancyB2DHelper

Functions

template<class T , int dim> cudaError_t cudaBindSurfaceToArray (const struct surface< T, dim > &surf, cudaArray_const_t array)
[C++ API] Binds an array to a surface
template<class T , int dim> cudaError_t cudaBindSurfaceToArray (const struct surface< T, dim > &surf, cudaArray_const_t array, const struct cudaChannelFormatDesc &desc)
[C++ API] Binds an array to a surface
template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTexture (size_t *offset, const struct texture< T, dim, readMode > &tex, const void *devPtr, size_t size=UINT_MAX)
[C++ API] Binds a memory area to a texture
template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTexture (size_t *offset, const struct texture< T, dim, readMode > &tex, const void *devPtr, const struct cudaChannelFormatDesc &desc, size_t size=UINT_MAX)
[C++ API] Binds a memory area to a texture
template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTexture2D (size_t *offset, const struct texture< T, dim, readMode > &tex, const void *devPtr, size_t width, size_t height, size_t pitch)
[C++ API] Binds a 2D memory area to a texture
template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTexture2D (size_t *offset, const struct texture< T, dim, readMode > &tex, const void *devPtr, const struct cudaChannelFormatDesc &desc, size_t width, size_t height, size_t pitch)
[C++ API] Binds a 2D memory area to a texture
template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTextureToArray (const struct texture< T, dim, readMode > &tex, cudaArray_const_t array)
[C++ API] Binds an array to a texture
template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTextureToArray (const struct texture< T, dim, readMode > &tex, cudaArray_const_t array, const struct cudaChannelFormatDesc &desc)
[C++ API] Binds an array to a texture
template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTextureToMipmappedArray (const struct texture< T, dim, readMode > &tex, cudaMipmappedArray_const_t mipmappedArray)
[C++ API] Binds a mipmapped array to a texture
template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTextureToMipmappedArray (const struct texture< T, dim, readMode > &tex, cudaMipmappedArray_const_t mipmappedArray, const struct cudaChannelFormatDesc &desc)
[C++ API] Binds a mipmapped array to a texture
template<class T > cudaChannelFormatDesc cudaCreateChannelDesc (void)
[C++ API] Returns a channel descriptor using the specified format
cudaError_t cudaEventCreate (cudaEvent_t *event, unsigned int flags)
[C++ API] Creates an event object with the specified flags
template<class T > cudaError_t cudaFuncGetAttributes (struct cudaFuncAttributes *attr, T *entry)
[C++ API] Find out attributes for a given function
template<class T > cudaError_t cudaFuncSetCacheConfig (T *func, enum cudaFuncCache cacheConfig)
[C++ API] Sets the preferred cache configuration for a device function
template<class T > cudaError_t cudaGetSymbolAddress (void **devPtr, const T &symbol)
[C++ API] Finds the address associated with a CUDA symbol
template<class T > cudaError_t cudaGetSymbolSize (size_t *size, const T &symbol)
[C++ API] Finds the size of the object associated with a CUDA symbol
template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaGetTextureAlignmentOffset (size_t *offset, const struct texture< T, dim, readMode > &tex)
[C++ API] Get the alignment offset of a texture
template<class T > cudaError_t cudaLaunch (T *func)
[C++ API] Launches a device function
template<class T > cudaError_t cudaLaunchKernel (const T *func, dim3 gridDim, dim3 blockDim, void **args, size_t sharedMem=0, cudaStream_t stream=0)
Launches a device function.
cudaError_t cudaMallocHost (void **ptr, size_t size, unsigned int flags)
[C++ API] Allocates page-locked memory on the host
template<class T > cudaError_t cudaMallocManaged (T **devPtr, size_t size, unsigned int flags=cudaMemAttachGlobal)
Allocates memory that will be automatically managed by the Unified Memory system.
template<class T > cudaError_t cudaMemcpyFromSymbol (void *dst, const T &symbol, size_t count, size_t offset=0, enum cudaMemcpyKind kind=cudaMemcpyDeviceToHost)
[C++ API] Copies data from the given symbol on the device
template<class T > cudaError_t cudaMemcpyFromSymbolAsync (void *dst, const T &symbol, size_t count, size_t offset=0, enum cudaMemcpyKind kind=cudaMemcpyDeviceToHost, cudaStream_t stream=0)
[C++ API] Copies data from the given symbol on the device
template<class T > cudaError_t cudaMemcpyToSymbol (const T &symbol, const void *src, size_t count, size_t offset=0, enum cudaMemcpyKind kind=cudaMemcpyHostToDevice)
[C++ API] Copies data to the given symbol on the device
template<class T > cudaError_t cudaMemcpyToSymbolAsync (const T &symbol, const void *src, size_t count, size_t offset=0, enum cudaMemcpyKind kind=cudaMemcpyHostToDevice, cudaStream_t stream=0)
[C++ API] Copies data to the given symbol on the device
template<class T > cudaError_t cudaOccupancyMaxActiveBlocksPerMultiprocessor (int *numBlocks, T func, int blockSize, size_t dynamicSMemSize)
Returns occupancy for a device function.
template<class T > cudaError_t cudaOccupancyMaxActiveBlocksPerMultiprocessorWithFlags (int *numBlocks, T func, int blockSize, size_t dynamicSMemSize, unsigned int flags)
Returns occupancy for a device function with the specified flags.
template<class T > CUDART_DEVICE cudaError_t cudaOccupancyMaxPotentialBlockSize (int *minGridSize, int *blockSize, T func, size_t dynamicSMemSize=0, int blockSizeLimit=0)
Returns grid and block size that achieves maximum potential occupancy for a device function.
template<typename UnaryFunction , class T > CUDART_DEVICE cudaError_t cudaOccupancyMaxPotentialBlockSizeVariableSMem (int *minGridSize, int *blockSize, T func, UnaryFunction blockSizeToDynamicSMemSize, int blockSizeLimit=0)
Returns grid and block size that achieves maximum potential occupancy for a device function.
template<typename UnaryFunction , class T > CUDART_DEVICE cudaError_t cudaOccupancyMaxPotentialBlockSizeVariableSMemWithFlags (int *minGridSize, int *blockSize, T func, UnaryFunction blockSizeToDynamicSMemSize, int blockSizeLimit=0, unsigned int flags=0)
Returns grid and block size that achieves maximum potential occupancy for a device function.
template<class T > CUDART_DEVICE cudaError_t cudaOccupancyMaxPotentialBlockSizeWithFlags (int *minGridSize, int *blockSize, T func, size_t dynamicSMemSize=0, int blockSizeLimit=0, unsigned int flags=0)
Returns grid and block size that achieved maximum potential occupancy for a device function with the specified flags.
template<class T > cudaError_t cudaSetupArgument (T arg, size_t offset)
[C++ API] Configure a device launch
template<class T > cudaError_t cudaStreamAttachMemAsync (cudaStream_t stream, T *devPtr, size_t length=0, unsigned int flags=cudaMemAttachSingle)
Attach memory to a stream asynchronously.
template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaUnbindTexture (const struct texture< T, dim, readMode > &tex)
[C++ API] Unbinds a texture

Detailed Description

\brief C++ high level API functions of the CUDA runtime API (cuda_runtime_api.h)

This section describes the C++ high level API functions of the CUDA runtime application programming interface. To use these functions, your application needs to be compiled with the nvcc compiler.

Function Documentation

template<class T , int dim> cudaError_t cudaBindSurfaceToArray (const struct surface< T, dim > & surf, cudaArray_const_t array)

Binds the CUDA array array to the surface reference surf. The channel descriptor is inherited from the CUDA array. Any CUDA array previously bound to surf is unbound.

Parameters:

surf - Surface to bind
array - Memory array on device

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidSurface

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaBindSurfaceToArray (C API), cudaBindSurfaceToArray (C++ API)

template<class T , int dim> cudaError_t cudaBindSurfaceToArray (const struct surface< T, dim > & surf, cudaArray_const_t array, const struct cudaChannelFormatDesc & desc)

Binds the CUDA array array to the surface reference surf. desc describes how the memory is interpreted when dealing with the surface. Any CUDA array previously bound to surf is unbound.

Parameters:

surf - Surface to bind
array - Memory array on device
desc - Channel format

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidSurface

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaBindSurfaceToArray (C API), cudaBindSurfaceToArray (C++ API, inherited channel descriptor)

template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTexture (size_t * offset, const struct texture< T, dim, readMode > & tex, const void * devPtr, size_t size = UINT_MAX)

Binds size bytes of the memory area pointed to by devPtr to texture reference tex. The channel descriptor is inherited from the texture reference type. The offset parameter is an optional byte offset as with the low-level cudaBindTexture(size_t*, const struct textureReference*, const void*, const struct cudaChannelFormatDesc*, size_t) function. Any memory previously bound to tex is unbound.

Parameters:

offset - Offset in bytes
tex - Texture to bind
devPtr - Memory area on device
size - Size of the memory area pointed to by devPtr

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C API), cudaBindTexture (C++ API), cudaBindTexture2D (C++ API), cudaBindTexture2D (C++ API, inherited channel descriptor), cudaBindTextureToArray (C++ API), cudaBindTextureToArray (C++ API, inherited channel descriptor), cudaUnbindTexture (C++ API), cudaGetTextureAlignmentOffset (C++ API)

template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTexture (size_t * offset, const struct texture< T, dim, readMode > & tex, const void * devPtr, const struct cudaChannelFormatDesc & desc, size_t size = UINT_MAX)

Binds size bytes of the memory area pointed to by devPtr to texture reference tex. desc describes how the memory is interpreted when fetching values from the texture. The offset parameter is an optional byte offset as with the low-level cudaBindTexture() function. Any memory previously bound to tex is unbound.

Parameters:

offset - Offset in bytes
tex - Texture to bind
devPtr - Memory area on device
desc - Channel format
size - Size of the memory area pointed to by devPtr

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C API), cudaBindTexture (C++ API, inherited channel descriptor), cudaBindTexture2D (C++ API), cudaBindTexture2D (C++ API, inherited channel descriptor), cudaBindTextureToArray (C++ API), cudaBindTextureToArray (C++ API, inherited channel descriptor), cudaUnbindTexture (C++ API), cudaGetTextureAlignmentOffset (C++ API)

template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTexture2D (size_t * offset, const struct texture< T, dim, readMode > & tex, const void * devPtr, size_t width, size_t height, size_t pitch)

Binds the 2D memory area pointed to by devPtr to the texture reference tex. The size of the area is constrained by width in texel units, height in texel units, and pitch in byte units. The channel descriptor is inherited from the texture reference type. Any memory previously bound to tex is unbound.

Since the hardware enforces an alignment requirement on texture base addresses, cudaBindTexture2D() returns in *offset a byte offset that must be applied to texture fetches in order to read from the desired memory. This offset must be divided by the texel size and passed to kernels that read from the texture so they can be applied to the tex2D() function. If the device memory pointer was returned from cudaMalloc(), the offset is guaranteed to be 0 and NULL may be passed as the offset parameter.

Parameters:

offset - Offset in bytes
tex - Texture reference to bind
devPtr - 2D memory area on device
width - Width in texel units
height - Height in texel units
pitch - Pitch in bytes

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C++ API), cudaBindTexture (C++ API, inherited channel descriptor), cudaBindTexture2D (C API), cudaBindTexture2D (C++ API), cudaBindTextureToArray (C++ API), cudaBindTextureToArray (C++ API, inherited channel descriptor), cudaUnbindTexture (C++ API), cudaGetTextureAlignmentOffset (C++ API)

template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTexture2D (size_t * offset, const struct texture< T, dim, readMode > & tex, const void * devPtr, const struct cudaChannelFormatDesc & desc, size_t width, size_t height, size_t pitch)

Binds the 2D memory area pointed to by devPtr to the texture reference tex. The size of the area is constrained by width in texel units, height in texel units, and pitch in byte units. desc describes how the memory is interpreted when fetching values from the texture. Any memory previously bound to tex is unbound.

Since the hardware enforces an alignment requirement on texture base addresses, cudaBindTexture2D() returns in *offset a byte offset that must be applied to texture fetches in order to read from the desired memory. This offset must be divided by the texel size and passed to kernels that read from the texture so they can be applied to the tex2D() function. If the device memory pointer was returned from cudaMalloc(), the offset is guaranteed to be 0 and NULL may be passed as the offset parameter.

Parameters:

offset - Offset in bytes
tex - Texture reference to bind
devPtr - 2D memory area on device
desc - Channel format
width - Width in texel units
height - Height in texel units
pitch - Pitch in bytes

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C++ API), cudaBindTexture (C++ API, inherited channel descriptor), cudaBindTexture2D (C API), cudaBindTexture2D (C++ API, inherited channel descriptor), cudaBindTextureToArray (C++ API), cudaBindTextureToArray (C++ API, inherited channel descriptor), cudaUnbindTexture (C++ API), cudaGetTextureAlignmentOffset (C++ API)

template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTextureToArray (const struct texture< T, dim, readMode > & tex, cudaArray_const_t array)

Binds the CUDA array array to the texture reference tex. The channel descriptor is inherited from the CUDA array. Any CUDA array previously bound to tex is unbound.

Parameters:

tex - Texture to bind
array - Memory array on device

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C++ API), cudaBindTexture (C++ API, inherited channel descriptor), cudaBindTexture2D (C++ API), cudaBindTexture2D (C++ API, inherited channel descriptor), cudaBindTextureToArray (C API), cudaBindTextureToArray (C++ API), cudaUnbindTexture (C++ API), cudaGetTextureAlignmentOffset (C++ API)

template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTextureToArray (const struct texture< T, dim, readMode > & tex, cudaArray_const_t array, const struct cudaChannelFormatDesc & desc)

Binds the CUDA array array to the texture reference tex. desc describes how the memory is interpreted when fetching values from the texture. Any CUDA array previously bound to tex is unbound.

Parameters:

tex - Texture to bind
array - Memory array on device
desc - Channel format

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C++ API), cudaBindTexture (C++ API, inherited channel descriptor), cudaBindTexture2D (C++ API), cudaBindTexture2D (C++ API, inherited channel descriptor), cudaBindTextureToArray (C API), cudaBindTextureToArray (C++ API, inherited channel descriptor), cudaUnbindTexture (C++ API), cudaGetTextureAlignmentOffset (C++ API)

template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTextureToMipmappedArray (const struct texture< T, dim, readMode > & tex, cudaMipmappedArray_const_t mipmappedArray)

Binds the CUDA mipmapped array mipmappedArray to the texture reference tex. The channel descriptor is inherited from the CUDA array. Any CUDA mipmapped array previously bound to tex is unbound.

Parameters:

tex - Texture to bind
mipmappedArray - Memory mipmapped array on device

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C++ API), cudaBindTexture (C++ API, inherited channel descriptor), cudaBindTexture2D (C++ API), cudaBindTexture2D (C++ API, inherited channel descriptor), cudaBindTextureToArray (C API), cudaBindTextureToArray (C++ API), cudaUnbindTexture (C++ API), cudaGetTextureAlignmentOffset (C++ API)

template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaBindTextureToMipmappedArray (const struct texture< T, dim, readMode > & tex, cudaMipmappedArray_const_t mipmappedArray, const struct cudaChannelFormatDesc & desc)

Binds the CUDA mipmapped array mipmappedArray to the texture reference tex. desc describes how the memory is interpreted when fetching values from the texture. Any CUDA mipmapped array previously bound to tex is unbound.

Parameters:

tex - Texture to bind
mipmappedArray - Memory mipmapped array on device
desc - Channel format

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C++ API), cudaBindTexture (C++ API, inherited channel descriptor), cudaBindTexture2D (C++ API), cudaBindTexture2D (C++ API, inherited channel descriptor), cudaBindTextureToArray (C API), cudaBindTextureToArray (C++ API, inherited channel descriptor), cudaUnbindTexture (C++ API), cudaGetTextureAlignmentOffset (C++ API)

template<class T > cudaChannelFormatDesc cudaCreateChannelDesc (void)

Returns a channel descriptor with format f and number of bits of each component x, y, z, and w. The cudaChannelFormatDesc is defined as:

  struct cudaChannelFormatDesc {
    int x, y, z, w;
    enum cudaChannelFormatKind f;
  };

where cudaChannelFormatKind is one of cudaChannelFormatKindSigned, cudaChannelFormatKindUnsigned, or cudaChannelFormatKindFloat.

Returns:

Channel descriptor with format f

See also:

cudaCreateChannelDesc (Low level), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (High level), cudaBindTexture (High level, inherited channel descriptor), cudaBindTexture2D (High level), cudaBindTextureToArray (High level), cudaBindTextureToArray (High level, inherited channel descriptor), cudaUnbindTexture (High level), cudaGetTextureAlignmentOffset (High level)

cudaError_t cudaEventCreate (cudaEvent_t * event, unsigned int flags)

Creates an event object with the specified flags. Valid flags include:

*

cudaEventDefault: Default event creation flag.

*

cudaEventBlockingSync: Specifies that event should use blocking synchronization. A host thread that uses cudaEventSynchronize() to wait on an event created with this flag will block until the event actually completes.

*

cudaEventDisableTiming: Specifies that the created event does not need to record timing data. Events created with this flag specified and the cudaEventBlockingSync flag not specified will provide the best performance when used with cudaStreamWaitEvent() and cudaEventQuery().

Parameters:

event - Newly created event
flags - Flags for new event

Returns:

cudaSuccess, cudaErrorInitializationError, cudaErrorInvalidValue, cudaErrorLaunchFailure, cudaErrorMemoryAllocation

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaEventCreate (C API), cudaEventCreateWithFlags, cudaEventRecord, cudaEventQuery, cudaEventSynchronize, cudaEventDestroy, cudaEventElapsedTime, cudaStreamWaitEvent

template<class T > cudaError_t cudaFuncGetAttributes (struct cudaFuncAttributes * attr, T * entry)

This function obtains the attributes of a function specified via entry. The parameter entry must be a pointer to a function that executes on the device. The parameter specified by entry must be declared as a __global__ function. The fetched attributes are placed in attr. If the specified function does not exist, then cudaErrorInvalidDeviceFunction is returned.

Note that some function attributes such as maxThreadsPerBlock may vary based on the device that is currently being used.

Parameters:

attr - Return pointer to function's attributes
entry - Function to get attributes of

Returns:

cudaSuccess, cudaErrorInitializationError, cudaErrorInvalidDeviceFunction

Note:

Note that this function may also return error codes from previous, asynchronous launches.

cudaLaunchKernel (C++ API), cudaFuncSetCacheConfig (C++ API), cudaFuncGetAttributes (C API), cudaSetDoubleForDevice, cudaSetDoubleForHost, cudaSetupArgument (C++ API)

template<class T > cudaError_t cudaFuncSetCacheConfig (T * func, enum cudaFuncCache cacheConfig)

On devices where the L1 cache and shared memory use the same hardware resources, this sets through cacheConfig the preferred cache configuration for the function specified via func. This is only a preference. The runtime will use the requested configuration if possible, but it is free to choose a different configuration if required to execute func.

func must be a pointer to a function that executes on the device. The parameter specified by func must be declared as a __global__ function. If the specified function does not exist, then cudaErrorInvalidDeviceFunction is returned.

This setting does nothing on devices where the size of the L1 cache and shared memory are fixed.

Launching a kernel with a different preference than the most recent preference setting may insert a device-side synchronization point.

The supported cache configurations are:

*

cudaFuncCachePreferNone: no preference for shared memory or L1 (default)

*

cudaFuncCachePreferShared: prefer larger shared memory and smaller L1 cache

*

cudaFuncCachePreferL1: prefer larger L1 cache and smaller shared memory

Parameters:

func - device function pointer
cacheConfig - Requested cache configuration

Returns:

cudaSuccess, cudaErrorInitializationError, cudaErrorInvalidDeviceFunction

Note:

Note that this function may also return error codes from previous, asynchronous launches.

cudaLaunchKernel (C++ API), cudaFuncSetCacheConfig (C API), cudaFuncGetAttributes (C++ API), cudaSetDoubleForDevice, cudaSetDoubleForHost, cudaSetupArgument (C++ API), cudaThreadGetCacheConfig, cudaThreadSetCacheConfig

template<class T > cudaError_t cudaGetSymbolAddress (void ** devPtr, const T & symbol)

Returns in *devPtr the address of symbol symbol on the device. symbol can either be a variable that resides in global or constant memory space. If symbol cannot be found, or if symbol is not declared in the global or constant memory space, *devPtr is unchanged and the error cudaErrorInvalidSymbol is returned.

Parameters:

devPtr - Return device pointer associated with symbol
symbol - Device symbol reference

Returns:

cudaSuccess, cudaErrorInvalidSymbol

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaGetSymbolAddress (C API), cudaGetSymbolSize (C++ API)

template<class T > cudaError_t cudaGetSymbolSize (size_t * size, const T & symbol)

Returns in *size the size of symbol symbol. symbol must be a variable that resides in global or constant memory space. If symbol cannot be found, or if symbol is not declared in global or constant memory space, *size is unchanged and the error cudaErrorInvalidSymbol is returned.

Parameters:

size - Size of object associated with symbol
symbol - Device symbol reference

Returns:

cudaSuccess, cudaErrorInvalidSymbol

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaGetSymbolAddress (C++ API), cudaGetSymbolSize (C API)

template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaGetTextureAlignmentOffset (size_t * offset, const struct texture< T, dim, readMode > & tex)

Returns in *offset the offset that was returned when texture reference tex was bound.

Parameters:

offset - Offset of texture reference in bytes
tex - Texture to get offset of

Returns:

cudaSuccess, cudaErrorInvalidTexture, cudaErrorInvalidTextureBinding

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C++ API), cudaBindTexture (C++ API, inherited channel descriptor), cudaBindTexture2D (C++ API), cudaBindTexture2D (C++ API, inherited channel descriptor), cudaBindTextureToArray (C++ API), cudaBindTextureToArray (C++ API, inherited channel descriptor), cudaUnbindTexture (C++ API), cudaGetTextureAlignmentOffset (C API)

template<class T > cudaError_t cudaLaunch (T * func)

Deprecated

This function is deprecated as of CUDA 7.0

Launches the function func on the device. The parameter func must be a function that executes on the device. The parameter specified by func must be declared as a __global__ function. cudaLaunch() must be preceded by a call to cudaConfigureCall() since it pops the data that was pushed by cudaConfigureCall() from the execution stack.

Parameters:

func - Device function pointer to execute

Returns:

cudaSuccess, cudaErrorInvalidDeviceFunction, cudaErrorInvalidConfiguration, cudaErrorLaunchFailure, cudaErrorLaunchTimeout, cudaErrorLaunchOutOfResources, cudaErrorSharedObjectSymbolNotFound, cudaErrorSharedObjectInitFailed

Note:

Note that this function may also return error codes from previous, asynchronous launches.

cudaLaunchKernel (C++ API), cudaFuncSetCacheConfig (C++ API), cudaFuncGetAttributes (C++ API), cudaLaunch (C API), cudaSetDoubleForDevice, cudaSetDoubleForHost, cudaSetupArgument (C++ API), cudaThreadGetCacheConfig, cudaThreadSetCacheConfig

template<class T > cudaError_t cudaLaunchKernel (const T * func, dim3 gridDim, dim3 blockDim, void ** args, size_t sharedMem = 0, cudaStream_t stream = 0)

The function invokes kernel func on gridDim (gridDim.x × gridDim.y × gridDim.z) grid of blocks. Each block contains blockDim (blockDim.x × blockDim.y × blockDim.z) threads.

If the kernel has N parameters the args should point to array of N pointers. Each pointer, from args[0] to args[N - 1], point to the region of memory from which the actual parameter will be copied.

sharedMem sets the amount of dynamic shared memory that will be available to each thread block.

stream specifies a stream the invocation is associated to.

Parameters:

func - Device function symbol
gridDim - Grid dimensions
blockDim - Block dimensions
args - Arguments
sharedMem - Shared memory (defaults to 0)
stream - Stream identifier (defaults to NULL)

Returns:

cudaSuccess, cudaErrorInvalidDeviceFunction, cudaErrorInvalidConfiguration, cudaErrorLaunchFailure, cudaErrorLaunchTimeout, cudaErrorLaunchOutOfResources, cudaErrorSharedObjectInitFailed

Note:

Note that this function may also return error codes from previous, asynchronous launches.

This function exhibits behavior for most use cases.

This function uses standard semantics.

cudaLaunchKernel (C API)

cudaError_t cudaMallocHost (void ** ptr, size_t size, unsigned int flags)

Allocates size bytes of host memory that is page-locked and accessible to the device. The driver tracks the virtual memory ranges allocated with this function and automatically accelerates calls to functions such as cudaMemcpy(). Since the memory can be accessed directly by the device, it can be read or written with much higher bandwidth than pageable memory obtained with functions such as malloc(). Allocating excessive amounts of pinned memory may degrade system performance, since it reduces the amount of memory available to the system for paging. As a result, this function is best used sparingly to allocate staging areas for data exchange between host and device.

The flags parameter enables different options to be specified that affect the allocation, as follows.

*

cudaHostAllocDefault: This flag's value is defined to be 0.

*

cudaHostAllocPortable: The memory returned by this call will be considered as pinned memory by all CUDA contexts, not just the one that performed the allocation.

*

cudaHostAllocMapped: Maps the allocation into the CUDA address space. The device pointer to the memory may be obtained by calling cudaHostGetDevicePointer().

*

cudaHostAllocWriteCombined: Allocates the memory as write-combined (WC). WC memory can be transferred across the PCI Express bus more quickly on some system configurations, but cannot be read efficiently by most CPUs. WC memory is a good option for buffers that will be written by the CPU and read by the device via mapped pinned memory or host->device transfers.

All of these flags are orthogonal to one another: a developer may allocate memory that is portable, mapped and/or write-combined with no restrictions.

cudaSetDeviceFlags() must have been called with the cudaDeviceMapHost flag in order for the cudaHostAllocMapped flag to have any effect.

The cudaHostAllocMapped flag may be specified on CUDA contexts for devices that do not support mapped pinned memory. The failure is deferred to cudaHostGetDevicePointer() because the memory may be mapped into other CUDA contexts via the cudaHostAllocPortable flag.

Memory allocated by this function must be freed with cudaFreeHost().

Parameters:

ptr - Device pointer to allocated memory
size - Requested allocation size in bytes
flags - Requested properties of allocated memory

Returns:

cudaSuccess, cudaErrorMemoryAllocation

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaSetDeviceFlags, cudaMallocHost (C API), cudaFreeHost, cudaHostAlloc

template<class T > cudaError_t cudaMallocManaged (T ** devPtr, size_t size, unsigned int flags = cudaMemAttachGlobal)

Allocates size bytes of managed memory on the device and returns in *devPtr a pointer to the allocated memory. If the device doesn't support allocating managed memory, cudaErrorNotSupported is returned. Support for managed memory can be queried using the device attribute cudaDevAttrManagedMemory. The allocated memory is suitably aligned for any kind of variable. The memory is not cleared. If size is 0, cudaMallocManaged returns cudaErrorInvalidValue. The pointer is valid on the CPU and on all GPUs in the system that support managed memory. All accesses to this pointer must obey the Unified Memory programming model.

flags specifies the default stream association for this allocation. flags must be one of cudaMemAttachGlobal or cudaMemAttachHost. The default value for flags is cudaMemAttachGlobal. If cudaMemAttachGlobal is specified, then this memory is accessible from any stream on any device. If cudaMemAttachHost is specified, then the allocation should not be accessed from devices that have a zero value for the device attribute cudaDevAttrConcurrentManagedAccess; an explicit call to cudaStreamAttachMemAsync will be required to enable access on such devices.

If the association is later changed via cudaStreamAttachMemAsync to a single stream, the default association, as specified during cudaMallocManaged, is restored when that stream is destroyed. For __managed__ variables, the default association is always cudaMemAttachGlobal. Note that destroying a stream is an asynchronous operation, and as a result, the change to default association won't happen until all work in the stream has completed.

Memory allocated with cudaMallocManaged should be released with cudaFree.

Device memory oversubscription is possible for GPUs that have a non-zero value for the device attribute cudaDevAttrConcurrentManagedAccess. Managed memory on such GPUs may be evicted from device memory to host memory at any time by the Unified Memory driver in order to make room for other allocations.

In a multi-GPU system where all GPUs have a non-zero value for the device attribute cudaDevAttrConcurrentManagedAccess, managed memory may not be populated when this API returns and instead may be populated on access. In such systems, managed memory can migrate to any processor's memory at any time. The Unified Memory driver will employ heuristics to maintain data locality and prevent excessive page faults to the extent possible. The application can also guide the driver about memory usage patterns via cudaMemAdvise. The application can also explicitly migrate memory to a desired processor's memory via cudaMemPrefetchAsync.

In a multi-GPU system where all of the GPUs have a zero value for the device attribute cudaDevAttrConcurrentManagedAccess and all the GPUs have peer-to-peer support with each other, the physical storage for managed memory is created on the GPU which is active at the time cudaMallocManaged is called. All other GPUs will reference the data at reduced bandwidth via peer mappings over the PCIe bus. The Unified Memory driver does not migrate memory among such GPUs.

In a multi-GPU system where not all GPUs have peer-to-peer support with each other and where the value of the device attribute cudaDevAttrConcurrentManagedAccess is zero for at least one of those GPUs, the location chosen for physical storage of managed memory is system-dependent.

*

On Linux, the location chosen will be device memory as long as the current set of active contexts are on devices that either have peer-to-peer support with each other or have a non-zero value for the device attribute cudaDevAttrConcurrentManagedAccess. If there is an active context on a GPU that does not have a non-zero value for that device attribute and it does not have peer-to-peer support with the other devices that have active contexts on them, then the location for physical storage will be 'zero-copy' or host memory. Note that this means that managed memory that is located in device memory is migrated to host memory if a new context is created on a GPU that doesn't have a non-zero value for the device attribute and does not support peer-to-peer with at least one of the other devices that has an active context. This in turn implies that context creation may fail if there is insufficient host memory to migrate all managed allocations.

*

On Windows, the physical storage is always created in 'zero-copy' or host memory. All GPUs will reference the data at reduced bandwidth over the PCIe bus. In these circumstances, use of the environment variable CUDA_VISIBLE_DEVICES is recommended to restrict CUDA to only use those GPUs that have peer-to-peer support. Alternatively, users can also set CUDA_MANAGED_FORCE_DEVICE_ALLOC to a non-zero value to force the driver to always use device memory for physical storage. When this environment variable is set to a non-zero value, all devices used in that process that support managed memory have to be peer-to-peer compatible with each other. The error cudaErrorInvalidDevice will be returned if a device that supports managed memory is used and it is not peer-to-peer compatible with any of the other managed memory supporting devices that were previously used in that process, even if cudaDeviceReset has been called on those devices. These environment variables are described in the CUDA programming guide under the 'CUDA environment variables' section.

Parameters:

devPtr - Pointer to allocated device memory
size - Requested allocation size in bytes
flags - Must be either cudaMemAttachGlobal or cudaMemAttachHost (defaults to cudaMemAttachGlobal)

Returns:

cudaSuccess, cudaErrorMemoryAllocation cudaErrorNotSupported cudaErrorInvalidValue

See also:

cudaMallocPitch, cudaFree, cudaMallocArray, cudaFreeArray, cudaMalloc3D, cudaMalloc3DArray, cudaMallocHost (C API), cudaFreeHost, cudaHostAlloc, cudaDeviceGetAttribute, cudaStreamAttachMemAsync

template<class T > cudaError_t cudaMemcpyFromSymbol (void * dst, const T & symbol, size_t count, size_t offset = 0, enum cudaMemcpyKind kind = cudaMemcpyDeviceToHost)

Copies count bytes from the memory area offset bytes from the start of symbol symbol to the memory area pointed to by dst. The memory areas may not overlap. symbol is a variable that resides in global or constant memory space. kind can be either cudaMemcpyDeviceToHost or cudaMemcpyDeviceToDevice.

Parameters:

dst - Destination memory address
symbol - Device symbol reference
count - Size in bytes to copy
offset - Offset from start of symbol in bytes
kind - Type of transfer

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidSymbol, cudaErrorInvalidDevicePointer, cudaErrorInvalidMemcpyDirection

Note:

Note that this function may also return error codes from previous, asynchronous launches.

This function exhibits behavior for most use cases.

Use of a string naming a variable as the symbol parameter was deprecated in CUDA 4.1 and removed in CUDA 5.0.

See also:

cudaMemcpy, cudaMemcpy2D, cudaMemcpyToArray, cudaMemcpy2DToArray, cudaMemcpyFromArray, cudaMemcpy2DFromArray, cudaMemcpyArrayToArray, cudaMemcpy2DArrayToArray, cudaMemcpyToSymbol, cudaMemcpyAsync, cudaMemcpy2DAsync, cudaMemcpyToArrayAsync, cudaMemcpy2DToArrayAsync, cudaMemcpyFromArrayAsync, cudaMemcpy2DFromArrayAsync, cudaMemcpyToSymbolAsync, cudaMemcpyFromSymbolAsync

template<class T > cudaError_t cudaMemcpyFromSymbolAsync (void * dst, const T & symbol, size_t count, size_t offset = 0, enum cudaMemcpyKind kind = cudaMemcpyDeviceToHost, cudaStream_t stream = 0)

Copies count bytes from the memory area offset bytes from the start of symbol symbol to the memory area pointed to by dst. The memory areas may not overlap. symbol is a variable that resides in global or constant memory space. kind can be either cudaMemcpyDeviceToHost or cudaMemcpyDeviceToDevice.

cudaMemcpyFromSymbolAsync() is asynchronous with respect to the host, so the call may return before the copy is complete. The copy can optionally be associated to a stream by passing a non-zero stream argument. If kind is cudaMemcpyDeviceToHost and stream is non-zero, the copy may overlap with operations in other streams.

Parameters:

dst - Destination memory address
symbol - Device symbol reference
count - Size in bytes to copy
offset - Offset from start of symbol in bytes
kind - Type of transfer
stream - Stream identifier

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidSymbol, cudaErrorInvalidDevicePointer, cudaErrorInvalidMemcpyDirection

Note:

Note that this function may also return error codes from previous, asynchronous launches.

This function exhibits behavior for most use cases.

Use of a string naming a variable as the symbol parameter was deprecated in CUDA 4.1 and removed in CUDA 5.0.

See also:

cudaMemcpy, cudaMemcpy2D, cudaMemcpyToArray, cudaMemcpy2DToArray, cudaMemcpyFromArray, cudaMemcpy2DFromArray, cudaMemcpyArrayToArray, cudaMemcpy2DArrayToArray, cudaMemcpyToSymbol, cudaMemcpyFromSymbol, cudaMemcpyAsync, cudaMemcpy2DAsync, cudaMemcpyToArrayAsync, cudaMemcpy2DToArrayAsync, cudaMemcpyFromArrayAsync, cudaMemcpy2DFromArrayAsync, cudaMemcpyToSymbolAsync

template<class T > cudaError_t cudaMemcpyToSymbol (const T & symbol, const void * src, size_t count, size_t offset = 0, enum cudaMemcpyKind kind = cudaMemcpyHostToDevice)

Copies count bytes from the memory area pointed to by src to the memory area offset bytes from the start of symbol symbol. The memory areas may not overlap. symbol is a variable that resides in global or constant memory space. kind can be either cudaMemcpyHostToDevice or cudaMemcpyDeviceToDevice.

Parameters:

symbol - Device symbol reference
src - Source memory address
count - Size in bytes to copy
offset - Offset from start of symbol in bytes
kind - Type of transfer

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidSymbol, cudaErrorInvalidDevicePointer, cudaErrorInvalidMemcpyDirection

Note:

Note that this function may also return error codes from previous, asynchronous launches.

This function exhibits behavior for most use cases.

Use of a string naming a variable as the symbol parameter was deprecated in CUDA 4.1 and removed in CUDA 5.0.

See also:

cudaMemcpy, cudaMemcpy2D, cudaMemcpyToArray, cudaMemcpy2DToArray, cudaMemcpyFromArray, cudaMemcpy2DFromArray, cudaMemcpyArrayToArray, cudaMemcpy2DArrayToArray, cudaMemcpyFromSymbol, cudaMemcpyAsync, cudaMemcpy2DAsync, cudaMemcpyToArrayAsync, cudaMemcpy2DToArrayAsync, cudaMemcpyFromArrayAsync, cudaMemcpy2DFromArrayAsync, cudaMemcpyToSymbolAsync, cudaMemcpyFromSymbolAsync

template<class T > cudaError_t cudaMemcpyToSymbolAsync (const T & symbol, const void * src, size_t count, size_t offset = 0, enum cudaMemcpyKind kind = cudaMemcpyHostToDevice, cudaStream_t stream = 0)

Copies count bytes from the memory area pointed to by src to the memory area offset bytes from the start of symbol symbol. The memory areas may not overlap. symbol is a variable that resides in global or constant memory space. kind can be either cudaMemcpyHostToDevice or cudaMemcpyDeviceToDevice.

cudaMemcpyToSymbolAsync() is asynchronous with respect to the host, so the call may return before the copy is complete. The copy can optionally be associated to a stream by passing a non-zero stream argument. If kind is cudaMemcpyHostToDevice and stream is non-zero, the copy may overlap with operations in other streams.

Parameters:

symbol - Device symbol reference
src - Source memory address
count - Size in bytes to copy
offset - Offset from start of symbol in bytes
kind - Type of transfer
stream - Stream identifier

Returns:

cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidSymbol, cudaErrorInvalidDevicePointer, cudaErrorInvalidMemcpyDirection

Note:

Note that this function may also return error codes from previous, asynchronous launches.

This function exhibits behavior for most use cases.

Use of a string naming a variable as the symbol parameter was deprecated in CUDA 4.1 and removed in CUDA 5.0.

See also:

cudaMemcpy, cudaMemcpy2D, cudaMemcpyToArray, cudaMemcpy2DToArray, cudaMemcpyFromArray, cudaMemcpy2DFromArray, cudaMemcpyArrayToArray, cudaMemcpy2DArrayToArray, cudaMemcpyToSymbol, cudaMemcpyFromSymbol, cudaMemcpyAsync, cudaMemcpy2DAsync, cudaMemcpyToArrayAsync, cudaMemcpy2DToArrayAsync, cudaMemcpyFromArrayAsync, cudaMemcpy2DFromArrayAsync, cudaMemcpyFromSymbolAsync

template<class T > cudaError_t cudaOccupancyMaxActiveBlocksPerMultiprocessor (int * numBlocks, T func, int blockSize, size_t dynamicSMemSize)

Returns in *numBlocks the maximum number of active blocks per streaming multiprocessor for the device function.

Parameters:

numBlocks - Returned occupancy
func - Kernel function for which occupancy is calculated
blockSize - Block size the kernel is intended to be launched with
dynamicSMemSize - Per-block dynamic shared memory usage intended, in bytes

Returns:

cudaSuccess, cudaErrorCudartUnloading, cudaErrorInitializationError, cudaErrorInvalidDevice, cudaErrorInvalidDeviceFunction, cudaErrorInvalidValue, cudaErrorUnknown,

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaOccupancyMaxActiveBlocksPerMultiprocessorWithFlags

cudaOccupancyMaxPotentialBlockSize

cudaOccupancyMaxPotentialBlockSizeWithFlags

cudaOccupancyMaxPotentialBlockSizeVariableSMem

cudaOccupancyMaxPotentialBlockSizeVariableSMemWithFlags

template<class T > cudaError_t cudaOccupancyMaxActiveBlocksPerMultiprocessorWithFlags (int * numBlocks, T func, int blockSize, size_t dynamicSMemSize, unsigned int flags)

Returns in *numBlocks the maximum number of active blocks per streaming multiprocessor for the device function.

The flags parameter controls how special cases are handled. Valid flags include:

*

cudaOccupancyDefault: keeps the default behavior as cudaOccupancyMaxActiveBlocksPerMultiprocessor

*

cudaOccupancyDisableCachingOverride: suppresses the default behavior on platform where global caching affects occupancy. On such platforms, if caching is enabled, but per-block SM resource usage would result in zero occupancy, the occupancy calculator will calculate the occupancy as if caching is disabled. Setting this flag makes the occupancy calculator to return 0 in such cases. More information can be found about this feature in the 'Unified L1/Texture Cache' section of the Maxwell tuning guide.

Parameters:

numBlocks - Returned occupancy
func - Kernel function for which occupancy is calculated
blockSize - Block size the kernel is intended to be launched with
dynamicSMemSize - Per-block dynamic shared memory usage intended, in bytes
flags - Requested behavior for the occupancy calculator

Returns:

cudaSuccess, cudaErrorCudartUnloading, cudaErrorInitializationError, cudaErrorInvalidDevice, cudaErrorInvalidDeviceFunction, cudaErrorInvalidValue, cudaErrorUnknown,

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaOccupancyMaxActiveBlocksPerMultiprocessor

cudaOccupancyMaxPotentialBlockSize

cudaOccupancyMaxPotentialBlockSizeWithFlags

cudaOccupancyMaxPotentialBlockSizeVariableSMem

cudaOccupancyMaxPotentialBlockSizeVariableSMemWithFlags

template<class T > CUDART_DEVICE cudaError_t cudaOccupancyMaxPotentialBlockSize (int * minGridSize, int * blockSize, T func, size_t dynamicSMemSize = 0, int blockSizeLimit = 0)

Returns in *minGridSize and *blocksize a suggested grid / block size pair that achieves the best potential occupancy (i.e. the maximum number of active warps with the smallest number of blocks).

Use

See also:

cudaOccupancyMaxPotentialBlockSizeVariableSMem if the amount of per-block dynamic shared memory changes with different block sizes.

Parameters:

minGridSize - Returned minimum grid size needed to achieve the best potential occupancy
blockSize - Returned block size
func - Device function symbol
dynamicSMemSize - Per-block dynamic shared memory usage intended, in bytes
blockSizeLimit - The maximum block size func is designed to work with. 0 means no limit.

Returns:

cudaSuccess, cudaErrorCudartUnloading, cudaErrorInitializationError, cudaErrorInvalidDevice, cudaErrorInvalidDeviceFunction, cudaErrorInvalidValue, cudaErrorUnknown,

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaOccupancyMaxPotentialBlockSizeWithFlags

cudaOccupancyMaxActiveBlocksPerMultiprocessor

cudaOccupancyMaxActiveBlocksPerMultiprocessorWithFlags

cudaOccupancyMaxPotentialBlockSizeVariableSMem

cudaOccupancyMaxPotentialBlockSizeVariableSMemWithFlags

template<typename UnaryFunction , class T > CUDART_DEVICE cudaError_t cudaOccupancyMaxPotentialBlockSizeVariableSMem (int * minGridSize, int * blockSize, T func, UnaryFunction blockSizeToDynamicSMemSize, int blockSizeLimit = 0)

Returns in *minGridSize and *blocksize a suggested grid / block size pair that achieves the best potential occupancy (i.e. the maximum number of active warps with the smallest number of blocks).

Parameters:

minGridSize - Returned minimum grid size needed to achieve the best potential occupancy
blockSize - Returned block size
func - Device function symbol
blockSizeToDynamicSMemSize - A unary function / functor that takes block size, and returns the size, in bytes, of dynamic shared memory needed for a block
blockSizeLimit - The maximum block size func is designed to work with. 0 means no limit.

Returns:

cudaSuccess, cudaErrorCudartUnloading, cudaErrorInitializationError, cudaErrorInvalidDevice, cudaErrorInvalidDeviceFunction, cudaErrorInvalidValue, cudaErrorUnknown,

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaOccupancyMaxPotentialBlockSizeVariableSMemWithFlags

cudaOccupancyMaxActiveBlocksPerMultiprocessor

cudaOccupancyMaxActiveBlocksPerMultiprocessorWithFlags

cudaOccupancyMaxPotentialBlockSize

cudaOccupancyMaxPotentialBlockSizeWithFlags

template<typename UnaryFunction , class T > CUDART_DEVICE cudaError_t cudaOccupancyMaxPotentialBlockSizeVariableSMemWithFlags (int * minGridSize, int * blockSize, T func, UnaryFunction blockSizeToDynamicSMemSize, int blockSizeLimit = 0, unsigned int flags = 0)

Returns in *minGridSize and *blocksize a suggested grid / block size pair that achieves the best potential occupancy (i.e. the maximum number of active warps with the smallest number of blocks).

The flags parameter controls how special cases are handled. Valid flags include:

*

cudaOccupancyDefault: keeps the default behavior as cudaOccupancyMaxPotentialBlockSizeVariableSMemWithFlags

*

cudaOccupancyDisableCachingOverride: This flag suppresses the default behavior on platform where global caching affects occupancy. On such platforms, if caching is enabled, but per-block SM resource usage would result in zero occupancy, the occupancy calculator will calculate the occupancy as if caching is disabled. Setting this flag makes the occupancy calculator to return 0 in such cases. More information can be found about this feature in the 'Unified L1/Texture Cache' section of the Maxwell tuning guide.

Parameters:

minGridSize - Returned minimum grid size needed to achieve the best potential occupancy
blockSize - Returned block size
func - Device function symbol
blockSizeToDynamicSMemSize - A unary function / functor that takes block size, and returns the size, in bytes, of dynamic shared memory needed for a block
blockSizeLimit - The maximum block size func is designed to work with. 0 means no limit.
flags - Requested behavior for the occupancy calculator

Returns:

cudaSuccess, cudaErrorCudartUnloading, cudaErrorInitializationError, cudaErrorInvalidDevice, cudaErrorInvalidDeviceFunction, cudaErrorInvalidValue, cudaErrorUnknown,

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaOccupancyMaxPotentialBlockSizeVariableSMem

cudaOccupancyMaxActiveBlocksPerMultiprocessor

cudaOccupancyMaxActiveBlocksPerMultiprocessorWithFlags

cudaOccupancyMaxPotentialBlockSize

cudaOccupancyMaxPotentialBlockSizeWithFlags

template<class T > CUDART_DEVICE cudaError_t cudaOccupancyMaxPotentialBlockSizeWithFlags (int * minGridSize, int * blockSize, T func, size_t dynamicSMemSize = 0, int blockSizeLimit = 0, unsigned int flags = 0)

Returns in *minGridSize and *blocksize a suggested grid / block size pair that achieves the best potential occupancy (i.e. the maximum number of active warps with the smallest number of blocks).

The flags parameter controls how special cases are handle. Valid flags include:

*

cudaOccupancyDefault: keeps the default behavior as cudaOccupancyMaxPotentialBlockSize

*

cudaOccupancyDisableCachingOverride: This flag suppresses the default behavior on platform where global caching affects occupancy. On such platforms, if caching is enabled, but per-block SM resource usage would result in zero occupancy, the occupancy calculator will calculate the occupancy as if caching is disabled. Setting this flag makes the occupancy calculator to return 0 in such cases. More information can be found about this feature in the 'Unified L1/Texture Cache' section of the Maxwell tuning guide.

Use

See also:

cudaOccupancyMaxPotentialBlockSizeVariableSMem if the amount of per-block dynamic shared memory changes with different block sizes.

Parameters:

minGridSize - Returned minimum grid size needed to achieve the best potential occupancy
blockSize - Returned block size
func - Device function symbol
dynamicSMemSize - Per-block dynamic shared memory usage intended, in bytes
blockSizeLimit - The maximum block size func is designed to work with. 0 means no limit.
flags - Requested behavior for the occupancy calculator

Returns:

cudaSuccess, cudaErrorCudartUnloading, cudaErrorInitializationError, cudaErrorInvalidDevice, cudaErrorInvalidDeviceFunction, cudaErrorInvalidValue, cudaErrorUnknown,

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaOccupancyMaxPotentialBlockSize

cudaOccupancyMaxActiveBlocksPerMultiprocessor

cudaOccupancyMaxActiveBlocksPerMultiprocessorWithFlags

cudaOccupancyMaxPotentialBlockSizeVariableSMem

cudaOccupancyMaxPotentialBlockSizeVariableSMemWithFlags

template<class T > cudaError_t cudaSetupArgument (T arg, size_t offset)

Deprecated

This function is deprecated as of CUDA 7.0

Pushes size bytes of the argument pointed to by arg at offset bytes from the start of the parameter passing area, which starts at offset 0. The arguments are stored in the top of the execution stack. cudaSetupArgument() must be preceded by a call to cudaConfigureCall().

Parameters:

arg - Argument to push for a kernel launch
offset - Offset in argument stack to push new arg

Returns:

cudaSuccess

Note:

Note that this function may also return error codes from previous, asynchronous launches.

cudaLaunchKernel (C++ API), cudaFuncGetAttributes (C++ API), cudaLaunch (C++ API), cudaSetDoubleForDevice, cudaSetDoubleForHost, cudaSetupArgument (C API)

template<class T > cudaError_t cudaStreamAttachMemAsync (cudaStream_t stream, T * devPtr, size_t length = 0, unsigned int flags = cudaMemAttachSingle)

Enqueues an operation in stream to specify stream association of length bytes of memory starting from devPtr. This function is a stream-ordered operation, meaning that it is dependent on, and will only take effect when, previous work in stream has completed. Any previous association is automatically replaced.

devPtr must point to an address within managed memory space declared using the __managed__ keyword or allocated with cudaMallocManaged.

length must be zero, to indicate that the entire allocation's stream association is being changed. Currently, it's not possible to change stream association for a portion of an allocation. The default value for length is zero.

The stream association is specified using flags which must be one of cudaMemAttachGlobal, cudaMemAttachHost or cudaMemAttachSingle. The default value for flags is cudaMemAttachSingle If the cudaMemAttachGlobal flag is specified, the memory can be accessed by any stream on any device. If the cudaMemAttachHost flag is specified, the program makes a guarantee that it won't access the memory on the device from any stream on a device that has a zero value for the device attribute cudaDevAttrConcurrentManagedAccess. If the cudaMemAttachSingle flag is specified and stream is associated with a device that has a zero value for the device attribute cudaDevAttrConcurrentManagedAccess, the program makes a guarantee that it will only access the memory on the device from stream. It is illegal to attach singly to the NULL stream, because the NULL stream is a virtual global stream and not a specific stream. An error will be returned in this case.

When memory is associated with a single stream, the Unified Memory system will allow CPU access to this memory region so long as all operations in stream have completed, regardless of whether other streams are active. In effect, this constrains exclusive ownership of the managed memory region by an active GPU to per-stream activity instead of whole-GPU activity.

Accessing memory on the device from streams that are not associated with it will produce undefined results. No error checking is performed by the Unified Memory system to ensure that kernels launched into other streams do not access this region.

It is a program's responsibility to order calls to cudaStreamAttachMemAsync via events, synchronization or other means to ensure legal access to memory at all times. Data visibility and coherency will be changed appropriately for all kernels which follow a stream-association change.

If stream is destroyed while data is associated with it, the association is removed and the association reverts to the default visibility of the allocation as specified at cudaMallocManaged. For __managed__ variables, the default association is always cudaMemAttachGlobal. Note that destroying a stream is an asynchronous operation, and as a result, the change to default association won't happen until all work in the stream has completed.

Parameters:

stream - Stream in which to enqueue the attach operation
devPtr - Pointer to memory (must be a pointer to managed memory)
length - Length of memory (must be zero, defaults to zero)
flags - Must be one of cudaMemAttachGlobal, cudaMemAttachHost or cudaMemAttachSingle (defaults to cudaMemAttachSingle)

Returns:

cudaSuccess, cudaErrorNotReady, cudaErrorInvalidValue cudaErrorInvalidResourceHandle

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaStreamCreate, cudaStreamCreateWithFlags, cudaStreamWaitEvent, cudaStreamSynchronize, cudaStreamAddCallback, cudaStreamDestroy, cudaMallocManaged

template<class T , int dim, enum cudaTextureReadMode readMode> cudaError_t cudaUnbindTexture (const struct texture< T, dim, readMode > & tex)

Unbinds the texture bound to tex.

Parameters:

tex - Texture to unbind

Returns:

cudaSuccess

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C++ API), cudaBindTexture (C++ API, inherited channel descriptor), cudaBindTexture2D (C++ API), cudaBindTexture2D (C++ API, inherited channel descriptor), cudaBindTextureToArray (C++ API), cudaBindTextureToArray (C++ API, inherited channel descriptor), cudaUnbindTexture (C API), cudaGetTextureAlignmentOffset (C++ API)

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