| /****************************************************************************** |
| * Copyright (c) 2011-2022, NVIDIA CORPORATION. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * * Neither the name of the NVIDIA CORPORATION nor the |
| * names of its contributors may be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| ******************************************************************************/ |
| |
| /** |
| * \file |
| * cub::DeviceMemcpy provides device-wide, parallel operations for copying data. |
| */ |
| |
| #pragma once |
| |
| #include <cub/config.cuh> |
| |
| #if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC) |
| # pragma GCC system_header |
| #elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG) |
| # pragma clang system_header |
| #elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC) |
| # pragma system_header |
| #endif // no system header |
| |
| #include <cub/device/dispatch/dispatch_batch_memcpy.cuh> |
| |
| #include <cstdint> |
| #include <type_traits> |
| |
| CUB_NAMESPACE_BEGIN |
| |
| /** |
| * @brief cub::DeviceMemcpy provides device-wide, parallel operations for copying data. |
| * \ingroup SingleModule |
| */ |
| struct DeviceMemcpy |
| { |
| /** |
| * @brief Copies data from a batch of given source buffers to their corresponding destination |
| * buffer. |
| * @note If any input buffer aliases memory from any output buffer the behavior is undefined. If |
| * any output buffer aliases memory of another output buffer the behavior is undefined. Input |
| * buffers can alias one another. |
| * |
| * @par Snippet |
| * The code snippet below illustrates usage of DeviceMemcpy::Batched for mutating strings withing |
| * a single string buffer. |
| * @par |
| * @code |
| * struct GetPtrToStringItem |
| * { |
| * __host__ __device__ __forceinline__ void *operator()(uint32_t index) |
| * { |
| * return &d_string_data_in[d_string_offsets[index]]; |
| * } |
| * char *d_string_data_in; |
| * uint32_t *d_string_offsets; |
| * }; |
| * |
| * struct GetStringItemSize |
| * { |
| * __host__ __device__ __forceinline__ uint32_t operator()(uint32_t index) |
| * { |
| * return d_string_offsets[index + 1] - d_string_offsets[index]; |
| * } |
| * uint32_t *d_string_offsets; |
| * }; |
| * |
| * uint32_t num_strings = 5; |
| * char *d_string_data_in; // e.g., "TomatoesBananasApplesOrangesGrapes" |
| * char *d_string_data_out; // e.g., " ... " |
| * uint32_t *d_string_offsets_old; // e.g., [0, 8, 15, 21, 28, 34] |
| * uint32_t *d_string_offsets_new; // e.g., [0, 6, 13, 19, 26, 34] |
| * uint32_t *d_gather_index; // e.g., [2, 1, 4, 3, 0] |
| * |
| * // Initialize an iterator that returns d_gather_index[i] when the i-th item is dereferenced |
| * auto gather_iterator = thrust::make_permutation_iterator(thrust::make_counting_iterator(0), |
| * d_gather_index); |
| * |
| * // Returns pointers to the input buffer for each string |
| * auto str_ptrs_in = thrust::make_transform_iterator(gather_iterator, |
| * GetPtrToStringItem{d_string_data_in, |
| * d_string_offsets_old}); |
| * |
| * // Returns the string size of the i-th string |
| * auto str_sizes = thrust::make_transform_iterator(gather_iterator, |
| * GetStringItemSize{d_string_offsets_old}); |
| * |
| * // Returns pointers to the output buffer for each string |
| * auto str_ptrs_out = thrust::make_transform_iterator(thrust::make_counting_iterator(0), |
| * GetPtrToStringItem{d_string_data_out, |
| * d_string_offsets_new}); |
| * |
| * // Determine temporary device storage requirements |
| * void *d_temp_storage = nullptr; |
| * size_t temp_storage_bytes = 0; |
| * cub::DeviceMemcpy::Batched(d_temp_storage, temp_storage_bytes, str_ptrs_in, str_ptrs_out, |
| * str_sizes, num_strings); |
| * |
| * // Allocate temporary storage |
| * cudaMalloc(&d_temp_storage, temp_storage_bytes); |
| * |
| * // Run batched copy algorithm (used to permute strings) |
| * cub::DeviceMemcpy::Batched(d_temp_storage, temp_storage_bytes, str_ptrs_in, str_ptrs_out, |
| * str_sizes, num_strings); |
| * |
| * // d_string_data_out <-- "ApplesBananasGrapesOrangesTomatoe" |
| * @endcode |
| * @tparam InputBufferIt <b>[inferred]</b> Device-accessible random-access input iterator type |
| * providing the pointers to the source memory buffers |
| * @tparam OutputBufferIt <b>[inferred]</b> Device-accessible random-access input iterator type |
| * providing the pointers to the destination memory buffers |
| * @tparam BufferSizeIteratorT <b>[inferred]</b> Device-accessible random-access input iterator |
| * type providing the number of bytes to be copied for each pair of buffers |
| * @param d_temp_storage [in] Device-accessible allocation of temporary storage. When NULL, the |
| * required allocation size is written to \p temp_storage_bytes and no work is done. |
| * @param temp_storage_bytes [in,out] Reference to size in bytes of \p d_temp_storage allocation |
| * @param input_buffer_it [in] Device-accessible iterator providing the pointers to the source |
| * memory buffers |
| * @param output_buffer_it [in] Device-accessible iterator providing the pointers to the |
| * destination memory buffers |
| * @param buffer_sizes [in] Device-accessible iterator providing the number of bytes to be copied |
| * for each pair of buffers |
| * @param num_buffers [in] The total number of buffer pairs |
| * @param stream [in] <b>[optional]</b> CUDA stream to launch kernels within. Default is |
| * stream<sub>0</sub>. |
| */ |
| template <typename InputBufferIt, typename OutputBufferIt, typename BufferSizeIteratorT> |
| CUB_RUNTIME_FUNCTION static cudaError_t Batched(void *d_temp_storage, |
| size_t &temp_storage_bytes, |
| InputBufferIt input_buffer_it, |
| OutputBufferIt output_buffer_it, |
| BufferSizeIteratorT buffer_sizes, |
| uint32_t num_buffers, |
| cudaStream_t stream = 0) |
| { |
| static_assert(std::is_pointer<cub::detail::value_t<InputBufferIt>>::value, |
| "DeviceMemcpy::Batched only supports copying of memory buffers." |
| "Please consider using DeviceCopy::Batched instead."); |
| static_assert(std::is_pointer<cub::detail::value_t<OutputBufferIt>>::value, |
| "DeviceMemcpy::Batched only supports copying of memory buffers." |
| "Please consider using DeviceCopy::Batched instead."); |
| |
| // Integer type large enough to hold any offset in [0, num_buffers) |
| using BufferOffsetT = uint32_t; |
| |
| // Integer type large enough to hold any offset in [0, num_thread_blocks_launched), where a safe |
| // uppper bound on num_thread_blocks_launched can be assumed to be given by |
| // IDIV_CEIL(num_buffers, 64) |
| using BlockOffsetT = uint32_t; |
| |
| return detail::DispatchBatchMemcpy<InputBufferIt, |
| OutputBufferIt, |
| BufferSizeIteratorT, |
| BufferOffsetT, |
| BlockOffsetT, |
| detail::DeviceBatchMemcpyPolicy<BufferOffsetT, BlockOffsetT>, |
| true>::Dispatch(d_temp_storage, |
| temp_storage_bytes, |
| input_buffer_it, |
| output_buffer_it, |
| buffer_sizes, |
| num_buffers, |
| stream); |
| } |
| }; |
| |
| CUB_NAMESPACE_END |
|
|
