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/******************************************************************************
* Copyright (c) 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::DeviceSelect::UniqueByKey provides device-wide, parallel operations for selecting unique items by key from sequences of data items residing within device-accessible memory.
*/
#include <cub/agent/agent_unique_by_key.cuh>
#include <cub/device/dispatch/dispatch_scan.cuh>
#include <cub/util_deprecated.cuh>
#include <cub/util_macro.cuh>
#include <cub/util_math.cuh>
#include <iterator>
CUB_NAMESPACE_BEGIN
/******************************************************************************
* Kernel entry points
*****************************************************************************/
/**
* Unique by key kernel entry point (multi-block)
*/
template <
typename ChainedPolicyT,
typename KeyInputIteratorT, ///< Random-access input iterator type for keys
typename ValueInputIteratorT, ///< Random-access input iterator type for values
typename KeyOutputIteratorT, ///< Random-access output iterator type for keys
typename ValueOutputIteratorT, ///< Random-access output iterator type for values
typename NumSelectedIteratorT, ///< Output iterator type for recording the number of items selected
typename ScanTileStateT, ///< Tile status interface type
typename EqualityOpT, ///< Equality operator type
typename OffsetT> ///< Signed integer type for global offsets
__launch_bounds__ (int(ChainedPolicyT::ActivePolicy::UniqueByKeyPolicyT::BLOCK_THREADS))
__global__ void DeviceUniqueByKeySweepKernel(
KeyInputIteratorT d_keys_in, ///< [in] Pointer to the input sequence of keys
ValueInputIteratorT d_values_in, ///< [in] Pointer to the input sequence of values
KeyOutputIteratorT d_keys_out, ///< [out] Pointer to the output sequence of selected data items
ValueOutputIteratorT d_values_out, ///< [out] Pointer to the output sequence of selected data items
NumSelectedIteratorT d_num_selected_out, ///< [out] Pointer to the total number of items selected (i.e., length of \p d_keys_out or \p d_values_out)
ScanTileStateT tile_state, ///< [in] Tile status interface
EqualityOpT equality_op, ///< [in] Equality operator
OffsetT num_items, ///< [in] Total number of input items (i.e., length of \p d_keys_in or \p d_values_in)
int num_tiles) ///< [in] Total number of tiles for the entire problem
{
using AgentUniqueByKeyPolicyT = typename ChainedPolicyT::ActivePolicy::UniqueByKeyPolicyT;
// Thread block type for selecting data from input tiles
using AgentUniqueByKeyT = AgentUniqueByKey<AgentUniqueByKeyPolicyT,
KeyInputIteratorT,
ValueInputIteratorT,
KeyOutputIteratorT,
ValueOutputIteratorT,
EqualityOpT,
OffsetT>;
// Shared memory for AgentUniqueByKey
__shared__ typename AgentUniqueByKeyT::TempStorage temp_storage;
// Process tiles
AgentUniqueByKeyT(temp_storage, d_keys_in, d_values_in, d_keys_out, d_values_out, equality_op, num_items).ConsumeRange(
num_tiles,
tile_state,
d_num_selected_out);
}
/******************************************************************************
* Policy
******************************************************************************/
template <typename KeyInputIteratorT>
struct DeviceUniqueByKeyPolicy
{
using KeyT = typename std::iterator_traits<KeyInputIteratorT>::value_type;
// SM350
struct Policy350 : ChainedPolicy<350, Policy350, Policy350>
{
const static int INPUT_SIZE = sizeof(KeyT);
enum
{
NOMINAL_4B_ITEMS_PER_THREAD = 9,
ITEMS_PER_THREAD = Nominal4BItemsToItems<KeyT>(NOMINAL_4B_ITEMS_PER_THREAD),
};
using UniqueByKeyPolicyT = AgentUniqueByKeyPolicy<128,
ITEMS_PER_THREAD,
cub::BLOCK_LOAD_WARP_TRANSPOSE,
cub::LOAD_LDG,
cub::BLOCK_SCAN_WARP_SCANS,
detail::default_delay_constructor_t<int>>;
};
// SM520
struct Policy520 : ChainedPolicy<520, Policy520, Policy350>
{
const static int INPUT_SIZE = sizeof(KeyT);
enum
{
NOMINAL_4B_ITEMS_PER_THREAD = 11,
ITEMS_PER_THREAD = Nominal4BItemsToItems<KeyT>(NOMINAL_4B_ITEMS_PER_THREAD),
};
using UniqueByKeyPolicyT = AgentUniqueByKeyPolicy<64,
ITEMS_PER_THREAD,
cub::BLOCK_LOAD_WARP_TRANSPOSE,
cub::LOAD_LDG,
cub::BLOCK_SCAN_WARP_SCANS,
detail::default_delay_constructor_t<int>>;
};
/// MaxPolicy
using MaxPolicy = Policy520;
};
/******************************************************************************
* Dispatch
******************************************************************************/
/**
* Utility class for dispatching the appropriately-tuned kernels for DeviceSelect
*/
template <
typename KeyInputIteratorT, ///< Random-access input iterator type for keys
typename ValueInputIteratorT, ///< Random-access input iterator type for values
typename KeyOutputIteratorT, ///< Random-access output iterator type for keys
typename ValueOutputIteratorT, ///< Random-access output iterator type for values
typename NumSelectedIteratorT, ///< Output iterator type for recording the number of items selected
typename EqualityOpT, ///< Equality operator type
typename OffsetT, ///< Signed integer type for global offsets
typename SelectedPolicy = DeviceUniqueByKeyPolicy<KeyInputIteratorT>>
struct DispatchUniqueByKey: SelectedPolicy
{
/******************************************************************************
* Types and constants
******************************************************************************/
enum
{
INIT_KERNEL_THREADS = 128,
};
// The input key and value type
using KeyT = typename std::iterator_traits<KeyInputIteratorT>::value_type;
using ValueT = typename std::iterator_traits<ValueInputIteratorT>::value_type;
// Tile status descriptor interface type
using ScanTileStateT = ScanTileState<OffsetT>;
void* 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.
size_t& temp_storage_bytes; ///< [in,out] Reference to size in bytes of \p d_temp_storage allocation
KeyInputIteratorT d_keys_in; ///< [in] Pointer to the input sequence of keys
ValueInputIteratorT d_values_in; ///< [in] Pointer to the input sequence of values
KeyOutputIteratorT d_keys_out; ///< [out] Pointer to the output sequence of selected data items
ValueOutputIteratorT d_values_out; ///< [out] Pointer to the output sequence of selected data items
NumSelectedIteratorT d_num_selected_out; ///< [out] Pointer to the total number of items selected (i.e., length of \p d_keys_out or \p d_values_out)
EqualityOpT equality_op; ///< [in] Equality operator
OffsetT num_items; ///< [in] Total number of input items (i.e., length of \p d_keys_in or \p d_values_in)
cudaStream_t stream; ///< [in] <b>[optional]</b> CUDA stream to launch kernels within. Default is stream<sub>0</sub>.
CUB_RUNTIME_FUNCTION __forceinline__
DispatchUniqueByKey(
void* 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.
size_t& temp_storage_bytes, ///< [in,out] Reference to size in bytes of \p d_temp_storage allocation
KeyInputIteratorT d_keys_in, ///< [in] Pointer to the input sequence of keys
ValueInputIteratorT d_values_in, ///< [in] Pointer to the input sequence of values
KeyOutputIteratorT d_keys_out, ///< [out] Pointer to the output sequence of selected data items
ValueOutputIteratorT d_values_out, ///< [out] Pointer to the output sequence of selected data items
NumSelectedIteratorT d_num_selected_out, ///< [out] Pointer to the total number of items selected (i.e., length of \p d_keys_out or \p d_values_out)
EqualityOpT equality_op, ///< [in] Equality operator
OffsetT num_items, ///< [in] Total number of input items (i.e., length of \p d_keys_in or \p d_values_in)
cudaStream_t stream ///< [in] <b>[optional]</b> CUDA stream to launch kernels within. Default is stream<sub>0</sub>.
):
d_temp_storage(d_temp_storage),
temp_storage_bytes(temp_storage_bytes),
d_keys_in(d_keys_in),
d_values_in(d_values_in),
d_keys_out(d_keys_out),
d_values_out(d_values_out),
d_num_selected_out(d_num_selected_out),
equality_op(equality_op),
num_items(num_items),
stream(stream)
{}
CUB_DETAIL_RUNTIME_DEBUG_SYNC_IS_NOT_SUPPORTED
CUB_RUNTIME_FUNCTION __forceinline__
DispatchUniqueByKey(
void* d_temp_storage,
size_t& temp_storage_bytes,
KeyInputIteratorT d_keys_in,
ValueInputIteratorT d_values_in,
KeyOutputIteratorT d_keys_out,
ValueOutputIteratorT d_values_out,
NumSelectedIteratorT d_num_selected_out,
EqualityOpT equality_op,
OffsetT num_items,
cudaStream_t stream,
bool debug_synchronous
):
d_temp_storage(d_temp_storage),
temp_storage_bytes(temp_storage_bytes),
d_keys_in(d_keys_in),
d_values_in(d_values_in),
d_keys_out(d_keys_out),
d_values_out(d_values_out),
d_num_selected_out(d_num_selected_out),
equality_op(equality_op),
num_items(num_items),
stream(stream)
{
CUB_DETAIL_RUNTIME_DEBUG_SYNC_USAGE_LOG
}
/******************************************************************************
* Dispatch entrypoints
******************************************************************************/
template <typename ActivePolicyT, typename InitKernel, typename ScanKernel>
CUB_RUNTIME_FUNCTION __host__ __forceinline__
cudaError_t Invoke(InitKernel init_kernel, ScanKernel scan_kernel)
{
using Policy = typename ActivePolicyT::UniqueByKeyPolicyT;
using UniqueByKeyAgentT = AgentUniqueByKey<Policy,
KeyInputIteratorT,
ValueInputIteratorT,
KeyOutputIteratorT,
ValueOutputIteratorT,
EqualityOpT,
OffsetT>;
cudaError error = cudaSuccess;
do
{
// Get device ordinal
int device_ordinal;
if (CubDebug(error = cudaGetDevice(&device_ordinal))) break;
// Number of input tiles
int tile_size = Policy::BLOCK_THREADS * Policy::ITEMS_PER_THREAD;
int num_tiles = static_cast<int>(cub::DivideAndRoundUp(num_items, tile_size));
// Size of virtual shared memory
int max_shmem = 0;
if (CubDebug(
error = cudaDeviceGetAttribute(&max_shmem,
cudaDevAttrMaxSharedMemoryPerBlock,
device_ordinal)))
{
break;
}
std::size_t vshmem_size = detail::VshmemSize(max_shmem, sizeof(typename UniqueByKeyAgentT::TempStorage), num_tiles);
// Specify temporary storage allocation requirements
size_t allocation_sizes[2] = {0, vshmem_size};
if (CubDebug(error = ScanTileStateT::AllocationSize(num_tiles, allocation_sizes[0]))) break; // bytes needed for tile status descriptors
// Compute allocation pointers into the single storage blob (or compute the necessary size of the blob)
void *allocations[2] = {NULL, NULL};
if (CubDebug(error = AliasTemporaries(d_temp_storage, temp_storage_bytes, allocations, allocation_sizes))) break;
if (d_temp_storage == NULL)
{
// Return if the caller is simply requesting the size of the storage allocation
break;
}
// Construct the tile status interface
ScanTileStateT tile_state;
if (CubDebug(error = tile_state.Init(num_tiles, allocations[0], allocation_sizes[0]))) break;
// Log init_kernel configuration
num_tiles = CUB_MAX(1, num_tiles);
int init_grid_size = cub::DivideAndRoundUp(num_tiles, INIT_KERNEL_THREADS);
#ifdef CUB_DETAIL_DEBUG_ENABLE_LOG
_CubLog("Invoking init_kernel<<<%d, %d, 0, %lld>>>()\n", init_grid_size, INIT_KERNEL_THREADS, (long long) stream);
#endif
// Invoke init_kernel to initialize tile descriptors
THRUST_NS_QUALIFIER::cuda_cub::launcher::triple_chevron(
init_grid_size, INIT_KERNEL_THREADS, 0, stream
).doit(init_kernel, tile_state, num_tiles, d_num_selected_out);
// Check for failure to launch
if (CubDebug(error = cudaPeekAtLastError())) break;
// Sync the stream if specified to flush runtime errors
error = detail::DebugSyncStream(stream);
if (CubDebug(error))
{
break;
}
// Return if empty problem
if (num_items == 0) break;
// Get max x-dimension of grid
int max_dim_x;
if (CubDebug(error = cudaDeviceGetAttribute(&max_dim_x, cudaDevAttrMaxGridDimX, device_ordinal))) break;
// Get grid size for scanning tiles
dim3 scan_grid_size;
scan_grid_size.z = 1;
scan_grid_size.y = cub::DivideAndRoundUp(num_tiles, max_dim_x);
scan_grid_size.x = CUB_MIN(num_tiles, max_dim_x);
// Log select_if_kernel configuration
#ifdef CUB_DETAIL_DEBUG_ENABLE_LOG
{
// Get SM occupancy for unique_by_key_kernel
int scan_sm_occupancy;
if (CubDebug(error = MaxSmOccupancy(scan_sm_occupancy, // out
scan_kernel,
Policy::BLOCK_THREADS)))
{
break;
}
_CubLog("Invoking unique_by_key_kernel<<<{%d,%d,%d}, %d, 0, "
"%lld>>>(), %d items per thread, %d SM occupancy\n",
scan_grid_size.x,
scan_grid_size.y,
scan_grid_size.z,
Policy::BLOCK_THREADS,
(long long)stream,
Policy::ITEMS_PER_THREAD,
scan_sm_occupancy);
}
#endif
// Invoke select_if_kernel
error = THRUST_NS_QUALIFIER::cuda_cub::launcher::triple_chevron(
scan_grid_size, Policy::BLOCK_THREADS, 0, stream
).doit(scan_kernel,
d_keys_in,
d_values_in,
d_keys_out,
d_values_out,
d_num_selected_out,
tile_state,
equality_op,
num_items,
num_tiles);
// Check for failure to launch
if (CubDebug(error))
{
break;
}
// Sync the stream if specified to flush runtime errors
error = detail::DebugSyncStream(stream);
if (CubDebug(error))
{
break;
}
}
while(0);
return error;
}
template <typename ActivePolicyT>
CUB_RUNTIME_FUNCTION __host__ __forceinline__
cudaError_t Invoke()
{
using MaxPolicyT = typename DispatchUniqueByKey::MaxPolicy;
// Ensure kernels are instantiated.
return Invoke<ActivePolicyT>(
DeviceCompactInitKernel<ScanTileStateT, NumSelectedIteratorT>,
DeviceUniqueByKeySweepKernel<
MaxPolicyT,
KeyInputIteratorT,
ValueInputIteratorT,
KeyOutputIteratorT,
ValueOutputIteratorT,
NumSelectedIteratorT,
ScanTileStateT,
EqualityOpT,
OffsetT>
);
}
/**
* Internal dispatch routine
*/
CUB_RUNTIME_FUNCTION __forceinline__
static cudaError_t Dispatch(
void* 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.
size_t &temp_storage_bytes, ///< [in,out] Reference to size in bytes of \p d_temp_storage allocation
KeyInputIteratorT d_keys_in, ///< [in] Pointer to the input sequence of keys
ValueInputIteratorT d_values_in, ///< [in] Pointer to the input sequence of values
KeyOutputIteratorT d_keys_out, ///< [out] Pointer to the output sequence of selected data items
ValueOutputIteratorT d_values_out, ///< [out] Pointer to the output sequence of selected data items
NumSelectedIteratorT d_num_selected_out, ///< [out] Pointer to the total number of items selected (i.e., length of \p d_keys_out or \p d_values_out)
EqualityOpT equality_op, ///< [in] Equality operator
OffsetT num_items, ///< [in] Total number of input items (i.e., the length of \p d_in)
cudaStream_t stream) ///< [in] <b>[optional]</b> CUDA stream to launch kernels within. Default is stream<sub>0</sub>.
{
using MaxPolicyT = typename DispatchUniqueByKey::MaxPolicy;
cudaError_t error;
do
{
// Get PTX version
int ptx_version = 0;
if (CubDebug(error = PtxVersion(ptx_version))) break;
// Create dispatch functor
DispatchUniqueByKey dispatch(
d_temp_storage,
temp_storage_bytes,
d_keys_in,
d_values_in,
d_keys_out,
d_values_out,
d_num_selected_out,
equality_op,
num_items,
stream);
// Dispatch to chained policy
if (CubDebug(error = MaxPolicyT::Invoke(ptx_version, dispatch))) break;
}
while (0);
return error;
}
CUB_DETAIL_RUNTIME_DEBUG_SYNC_IS_NOT_SUPPORTED
CUB_RUNTIME_FUNCTION __forceinline__
static cudaError_t Dispatch(
void* d_temp_storage,
size_t &temp_storage_bytes,
KeyInputIteratorT d_keys_in,
ValueInputIteratorT d_values_in,
KeyOutputIteratorT d_keys_out,
ValueOutputIteratorT d_values_out,
NumSelectedIteratorT d_num_selected_out,
EqualityOpT equality_op,
OffsetT num_items,
cudaStream_t stream,
bool debug_synchronous)
{
CUB_DETAIL_RUNTIME_DEBUG_SYNC_USAGE_LOG
return Dispatch(d_temp_storage,
temp_storage_bytes,
d_keys_in,
d_values_in,
d_keys_out,
d_values_out,
d_num_selected_out,
equality_op,
num_items,
stream);
}
};
CUB_NAMESPACE_END
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