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138 Module DocumentationFor CUDA arrays, dstXInBytes must be evenly divisible by the array element size.• WidthInBytes and Height specify the width (in bytes) and height of the 2D copy being performed. Any pitchesmust be greater than or equal to WidthInBytes.cuMemcpy2D() returns an error if any pitch is greater than the maximum allowed (CU_DEVICE_ATTRIBUTE_-MAX_PITCH). cuMemAllocPitch() passes back pitches that always work with cuMemcpy2D(). On intra-devicememory copies (device ? device, CUDA array ? device, CUDA array ? CUDA array), cuMemcpy2D() may failfor pitches not computed by cuMemAllocPitch(). cuMemcpy2DUnaligned() does not have this restriction, butmay run significantly slower in the cases where cuMemcpy2D() would have returned an error code.Parameters:pCopy - Parameters for the memory copyReturns:Note:CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED, CUDA_-ERROR_INVALID_CONTEXT, CUDA_ERROR_INVALID_VALUESee also:Note that this function may also return error codes from previous, asynchronous launches.cuArray3DCreate, cuArray3DGetDescriptor, cuArrayCreate, cuArrayDestroy, cuArrayGetDescriptor, cuMemAlloc,cuMemAllocHost, cuMemAllocPitch, cuMemcpy2DAsync, cuMemcpy2DUnaligned, cuMemcpy3D,cuMemcpy3DAsync, cuMemcpyAtoA, cuMemcpyAtoD, cuMemcpyAtoH, cuMemcpyAtoHAsync, cuMemcpy-DtoA, cuMemcpyDtoD, cuMemcpyDtoH, cuMemcpyDtoHAsync, cuMemcpyHtoA, cuMemcpyHtoAAsync,cuMemcpyHtoD, cuMemcpyHtoDAsync, cuMemFree, cuMemFreeHost, cuMemGetAddressRange, cuMemGet-Info, cuMemHostAlloc, cuMemHostGetDevicePointer, cuMemsetD2D8, cuMemsetD2D16, cuMemsetD2D32,cuMemsetD8, cuMemsetD16, cuMemsetD323.25.2.10 CUresult cuMemcpy2DAsync (const CUDA_MEMCPY2D ∗ pCopy, CUstream hStream)Perform a 2D memory copy according to the parameters specified in pCopy. The CUDA_MEMCPY2D structure isdefined as:typedef struct CUDA_MEMCPY2D_st {unsigned int srcXInBytes, srcY;CUmemorytype srcMemoryType;const void *srcHost;CUdeviceptr srcDevice;CUarray srcArray;unsigned int srcPitch;unsigned int dstXInBytes, dstY;CUmemorytype dstMemoryType;void *dstHost;CUdeviceptr dstDevice;CUarray dstArray;unsigned int dstPitch;unsigned int WidthInBytes;unsigned int Height;} CUDA_MEMCPY2D;Generated on Wed Apr 1 16:11:42 2009 for NVIDIA CUDA Library by Doxygen
3.25 Memory Management 139where:• srcMemoryType and dstMemoryType specify the type of memory of the source and destination, respectively;CUmemorytype_enum is defined as:typedef enum CUmemorytype_enum {CU_MEMORYTYPE_HOST = 0x01,CU_MEMORYTYPE_DEVICE = 0x02,CU_MEMORYTYPE_ARRAY = 0x03} CUmemorytype;If srcMemoryType is CU_MEMORYTYPE_HOST, srcHost and srcPitch specify the (host) base address of thesource data and the bytes per row to apply. srcArray is ignored.If srcMemoryType is CU_MEMORYTYPE_DEVICE, srcDevice and srcPitch specify the (device) base addressof the source data and the bytes per row to apply. srcArray is ignored.If srcMemoryType is CU_MEMORYTYPE_ARRAY, srcArray specifies the handle of the source data. srcHost,srcDevice and srcPitch are ignored.If dstMemoryType is CU_MEMORYTYPE_HOST, dstHost and dstPitch specify the (host) base address of thedestination data and the bytes per row to apply. dstArray is ignored.If dstMemoryType is CU_MEMORYTYPE_DEVICE, dstDevice and dstPitch specify the (device) base addressof the destination data and the bytes per row to apply. dstArray is ignored.If dstMemoryType is CU_MEMORYTYPE_ARRAY, dstArray specifies the handle of the destination data.dstHost, dstDevice and dstPitch are ignored.• srcXInBytes and srcY specify the base address of the source data for the copy.For host pointers, the starting address isvoid* Start = (void*)((char*)srcHost+srcY*srcPitch + srcXInBytes);For device pointers, the starting address isCUdeviceptr Start = srcDevice+srcY*srcPitch+srcXInBytes;For CUDA arrays, srcXInBytes must be evenly divisible by the array element size.• dstXInBytes and dstY specify the base address of the destination data for the copy.For host pointers, the base address isvoid* dstStart = (void*)((char*)dstHost+dstY*dstPitch + dstXInBytes);Generated on Wed Apr 1 16:11:42 2009 for NVIDIA CUDA Library by Doxygen
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NVIDIA CUDAReference ManualVersion
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iiCONTENTS3.5 Stream Management . .
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ivCONTENTS3.10 Direct3D 9 Interoper
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viCONTENTS3.15.2.2 cudaComputeMode
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