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* Copyright (c) 2011, Duane Merrill. All rights reserved.
* 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::DeviceReduceByKey provides device-wide, parallel operations for
* reducing segments of values residing within device-accessible memory.
*/
#pragma once
#include <cub/agent/agent_reduce_by_key.cuh>
#include <cub/config.cuh>
#include <cub/device/dispatch/dispatch_scan.cuh>
#include <cub/grid/grid_queue.cuh>
#include <cub/thread/thread_operators.cuh>
#include <cub/util_deprecated.cuh>
#include <cub/util_device.cuh>
#include <cub/util_math.cuh>
#include <thrust/system/cuda/detail/core/triple_chevron_launch.h>
#include <cstdio>
#include <iterator>
#include <nv/target>
CUB_NAMESPACE_BEGIN
/******************************************************************************
* Kernel entry points
*****************************************************************************/
/**
* @brief Multi-block reduce-by-key sweep kernel entry point
*
* @tparam AgentReduceByKeyPolicyT
* Parameterized AgentReduceByKeyPolicyT tuning policy type
*
* @tparam KeysInputIteratorT
* Random-access input iterator type for keys
*
* @tparam UniqueOutputIteratorT
* Random-access output iterator type for keys
*
* @tparam ValuesInputIteratorT
* Random-access input iterator type for values
*
* @tparam AggregatesOutputIteratorT
* Random-access output iterator type for values
*
* @tparam NumRunsOutputIteratorT
* Output iterator type for recording number of segments encountered
*
* @tparam ScanTileStateT
* Tile status interface type
*
* @tparam EqualityOpT
* KeyT equality operator type
*
* @tparam ReductionOpT
* ValueT reduction operator type
*
* @tparam OffsetT
* Signed integer type for global offsets
*
* @param d_keys_in
* Pointer to the input sequence of keys
*
* @param d_unique_out
* Pointer to the output sequence of unique keys (one key per run)
*
* @param d_values_in
* Pointer to the input sequence of corresponding values
*
* @param d_aggregates_out
* Pointer to the output sequence of value aggregates (one aggregate per run)
*
* @param d_num_runs_out
* Pointer to total number of runs encountered
* (i.e., the length of d_unique_out)
*
* @param tile_state
* Tile status interface
*
* @param start_tile
* The starting tile for the current grid
*
* @param equality_op
* KeyT equality operator
*
* @param reduction_op
* ValueT reduction operator
*
* @param num_items
* Total number of items to select from
*/
template <typename ChainedPolicyT,
typename KeysInputIteratorT,
typename UniqueOutputIteratorT,
typename ValuesInputIteratorT,
typename AggregatesOutputIteratorT,
typename NumRunsOutputIteratorT,
typename ScanTileStateT,
typename EqualityOpT,
typename ReductionOpT,
typename OffsetT,
typename AccumT>
__launch_bounds__(int(ChainedPolicyT::ActivePolicy::ReduceByKeyPolicyT::BLOCK_THREADS)) __global__
void DeviceReduceByKeyKernel(KeysInputIteratorT d_keys_in,
UniqueOutputIteratorT d_unique_out,
ValuesInputIteratorT d_values_in,
AggregatesOutputIteratorT d_aggregates_out,
NumRunsOutputIteratorT d_num_runs_out,
ScanTileStateT tile_state,
int start_tile,
EqualityOpT equality_op,
ReductionOpT reduction_op,
OffsetT num_items)
{
using AgentReduceByKeyPolicyT = typename ChainedPolicyT::ActivePolicy::ReduceByKeyPolicyT;
// Thread block type for reducing tiles of value segments
using AgentReduceByKeyT = AgentReduceByKey<AgentReduceByKeyPolicyT,
KeysInputIteratorT,
UniqueOutputIteratorT,
ValuesInputIteratorT,
AggregatesOutputIteratorT,
NumRunsOutputIteratorT,
EqualityOpT,
ReductionOpT,
OffsetT,
AccumT>;
// Shared memory for AgentReduceByKey
__shared__ typename AgentReduceByKeyT::TempStorage temp_storage;
// Process tiles
AgentReduceByKeyT(temp_storage,
d_keys_in,
d_unique_out,
d_values_in,
d_aggregates_out,
d_num_runs_out,
equality_op,
reduction_op)
.ConsumeRange(num_items, tile_state, start_tile);
}
namespace detail
{
template <class AccumT, class KeyOutputT>
struct device_reduce_by_key_policy_hub
{
static constexpr int MAX_INPUT_BYTES = CUB_MAX(sizeof(KeyOutputT), sizeof(AccumT));
static constexpr int COMBINED_INPUT_BYTES = sizeof(KeyOutputT) + sizeof(AccumT);
/// SM35
struct Policy350 : ChainedPolicy<350, Policy350, Policy350>
{
static constexpr int NOMINAL_4B_ITEMS_PER_THREAD = 6;
static constexpr int ITEMS_PER_THREAD =
(MAX_INPUT_BYTES <= 8)
? 6
: CUB_MIN(NOMINAL_4B_ITEMS_PER_THREAD,
CUB_MAX(1,
((NOMINAL_4B_ITEMS_PER_THREAD * 8) + COMBINED_INPUT_BYTES - 1) /
COMBINED_INPUT_BYTES));
using ReduceByKeyPolicyT =
AgentReduceByKeyPolicy<128,
ITEMS_PER_THREAD,
BLOCK_LOAD_DIRECT,
LOAD_LDG,
BLOCK_SCAN_WARP_SCANS,
detail::default_reduce_by_key_delay_constructor_t<AccumT, int>>;
};
using MaxPolicy = Policy350;
};
}
/******************************************************************************
* Dispatch
******************************************************************************/
/**
* @brief Utility class for dispatching the appropriately-tuned kernels for
* DeviceReduceByKey
*
* @tparam KeysInputIteratorT
* Random-access input iterator type for keys
*
* @tparam UniqueOutputIteratorT
* Random-access output iterator type for keys
*
* @tparam ValuesInputIteratorT
* Random-access input iterator type for values
*
* @tparam AggregatesOutputIteratorT
* Random-access output iterator type for values
*
* @tparam NumRunsOutputIteratorT
* Output iterator type for recording number of segments encountered
*
* @tparam EqualityOpT
* KeyT equality operator type
*
* @tparam ReductionOpT
* ValueT reduction operator type
*
* @tparam OffsetT
* Signed integer type for global offsets
*
* @tparam SelectedPolicy
* Implementation detail, do not specify directly, requirements on the
* content of this type are subject to breaking change.
*/
template <typename KeysInputIteratorT,
typename UniqueOutputIteratorT,
typename ValuesInputIteratorT,
typename AggregatesOutputIteratorT,
typename NumRunsOutputIteratorT,
typename EqualityOpT,
typename ReductionOpT,
typename OffsetT,
typename AccumT = detail::accumulator_t<ReductionOpT,
cub::detail::value_t<ValuesInputIteratorT>,
cub::detail::value_t<ValuesInputIteratorT>>,
typename SelectedPolicy = //
detail::device_reduce_by_key_policy_hub< //
AccumT, //
cub::detail::non_void_value_t< //
UniqueOutputIteratorT, //
cub::detail::value_t<KeysInputIteratorT>>>>
struct DispatchReduceByKey
{
//-------------------------------------------------------------------------
// Types and constants
//-------------------------------------------------------------------------
// The input values type
using ValueInputT = cub::detail::value_t<ValuesInputIteratorT>;
static constexpr int INIT_KERNEL_THREADS = 128;
// Tile status descriptor interface type
using ScanTileStateT = ReduceByKeyScanTileState<AccumT, OffsetT>;
void *d_temp_storage;
size_t &temp_storage_bytes;
KeysInputIteratorT d_keys_in;
UniqueOutputIteratorT d_unique_out;
ValuesInputIteratorT d_values_in;
AggregatesOutputIteratorT d_aggregates_out;
NumRunsOutputIteratorT d_num_runs_out;
EqualityOpT equality_op;
ReductionOpT reduction_op;
OffsetT num_items;
cudaStream_t stream;
CUB_RUNTIME_FUNCTION __forceinline__
DispatchReduceByKey(void *d_temp_storage,
size_t &temp_storage_bytes,
KeysInputIteratorT d_keys_in,
UniqueOutputIteratorT d_unique_out,
ValuesInputIteratorT d_values_in,
AggregatesOutputIteratorT d_aggregates_out,
NumRunsOutputIteratorT d_num_runs_out,
EqualityOpT equality_op,
ReductionOpT reduction_op,
OffsetT num_items,
cudaStream_t stream)
: d_temp_storage(d_temp_storage)
, temp_storage_bytes(temp_storage_bytes)
, d_keys_in(d_keys_in)
, d_unique_out(d_unique_out)
, d_values_in(d_values_in)
, d_aggregates_out(d_aggregates_out)
, d_num_runs_out(d_num_runs_out)
, equality_op(equality_op)
, reduction_op(reduction_op)
, num_items(num_items)
, stream(stream)
{}
//---------------------------------------------------------------------
// Dispatch entrypoints
//---------------------------------------------------------------------
template <typename ActivePolicyT, typename ScanInitKernelT, typename ReduceByKeyKernelT>
CUB_RUNTIME_FUNCTION __forceinline__ cudaError_t Invoke(ScanInitKernelT init_kernel,
ReduceByKeyKernelT reduce_by_key_kernel)
{
using AgentReduceByKeyPolicyT = typename ActivePolicyT::ReduceByKeyPolicyT;
const int block_threads = AgentReduceByKeyPolicyT::BLOCK_THREADS;
const int items_per_thread = AgentReduceByKeyPolicyT::ITEMS_PER_THREAD;
cudaError error = cudaSuccess;
do
{
// Get device ordinal
int device_ordinal;
if (CubDebug(error = cudaGetDevice(&device_ordinal)))
{
break;
}
// Number of input tiles
int tile_size = block_threads * items_per_thread;
int num_tiles = static_cast<int>(cub::DivideAndRoundUp(num_items, tile_size));
// Specify temporary storage allocation requirements
size_t allocation_sizes[1];
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[1] = {};
if (CubDebug(
error =
AliasTemporaries(d_temp_storage, temp_storage_bytes, allocations, allocation_sizes)))
{
break;
}
if (d_temp_storage == nullptr)
{
// 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
int init_grid_size = CUB_MAX(1, 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_runs_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 SM occupancy for reduce_by_key_kernel
int reduce_by_key_sm_occupancy;
if (CubDebug(error = MaxSmOccupancy(reduce_by_key_sm_occupancy,
reduce_by_key_kernel,
block_threads)))
{
break;
}
// Get max x-dimension of grid
int max_dim_x;
if (CubDebug(
error = cudaDeviceGetAttribute(&max_dim_x, cudaDevAttrMaxGridDimX, device_ordinal)))
{
break;
}
// Run grids in epochs (in case number of tiles exceeds max x-dimension
int scan_grid_size = CUB_MIN(num_tiles, max_dim_x);
for (int start_tile = 0; start_tile < num_tiles; start_tile += scan_grid_size)
{
// Log reduce_by_key_kernel configuration
#ifdef CUB_DETAIL_DEBUG_ENABLE_LOG
_CubLog("Invoking %d reduce_by_key_kernel<<<%d, %d, 0, %lld>>>(), %d "
"items per thread, %d SM occupancy\n",
start_tile,
scan_grid_size,
block_threads,
(long long)stream,
items_per_thread,
reduce_by_key_sm_occupancy);
#endif
// Invoke reduce_by_key_kernel
THRUST_NS_QUALIFIER::cuda_cub::launcher::triple_chevron(scan_grid_size,
block_threads,
0,
stream)
.doit(reduce_by_key_kernel,
d_keys_in,
d_unique_out,
d_values_in,
d_aggregates_out,
d_num_runs_out,
tile_state,
start_tile,
equality_op,
reduction_op,
num_items);
// 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;
}
}
} while (0);
return error;
}
template <typename ActivePolicyT>
CUB_RUNTIME_FUNCTION __forceinline__ cudaError_t Invoke()
{
using MaxPolicyT = typename SelectedPolicy::MaxPolicy;
return Invoke<ActivePolicyT>(DeviceCompactInitKernel<ScanTileStateT, NumRunsOutputIteratorT>,
DeviceReduceByKeyKernel<MaxPolicyT,
KeysInputIteratorT,
UniqueOutputIteratorT,
ValuesInputIteratorT,
AggregatesOutputIteratorT,
NumRunsOutputIteratorT,
ScanTileStateT,
EqualityOpT,
ReductionOpT,
OffsetT,
AccumT>);
}
/**
* Internal dispatch routine
* @param[in] d_temp_storage
* Device-accessible allocation of temporary storage. When `nullptr`, the
* required allocation size is written to `temp_storage_bytes` and no
* work is done.
*
* @param[in,out] temp_storage_bytes
* Reference to size in bytes of `d_temp_storage` allocation
*
* @param[in] d_keys_in
* Pointer to the input sequence of keys
*
* @param[out] d_unique_out
* Pointer to the output sequence of unique keys (one key per run)
*
* @param[in] d_values_in
* Pointer to the input sequence of corresponding values
*
* @param[out] d_aggregates_out
* Pointer to the output sequence of value aggregates
* (one aggregate per run)
*
* @param[out] d_num_runs_out
* Pointer to total number of runs encountered
* (i.e., the length of d_unique_out)
*
* @param[in] equality_op
* KeyT equality operator
*
* @param[in] reduction_op
* ValueT reduction operator
*
* @param[in] num_items
* Total number of items to select from
*
* @param[in] stream
* CUDA stream to launch kernels within. Default is stream<sub>0</sub>.
*/
CUB_RUNTIME_FUNCTION __forceinline__ static cudaError_t
Dispatch(void *d_temp_storage,
size_t &temp_storage_bytes,
KeysInputIteratorT d_keys_in,
UniqueOutputIteratorT d_unique_out,
ValuesInputIteratorT d_values_in,
AggregatesOutputIteratorT d_aggregates_out,
NumRunsOutputIteratorT d_num_runs_out,
EqualityOpT equality_op,
ReductionOpT reduction_op,
OffsetT num_items,
cudaStream_t stream)
{
using MaxPolicyT = typename SelectedPolicy::MaxPolicy;
cudaError error = cudaSuccess;
do
{
// Get PTX version
int ptx_version = 0;
if (CubDebug(error = PtxVersion(ptx_version)))
{
break;
}
DispatchReduceByKey dispatch(d_temp_storage,
temp_storage_bytes,
d_keys_in,
d_unique_out,
d_values_in,
d_aggregates_out,
d_num_runs_out,
equality_op,
reduction_op,
num_items,
stream);
// Dispatch
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,
KeysInputIteratorT d_keys_in,
UniqueOutputIteratorT d_unique_out,
ValuesInputIteratorT d_values_in,
AggregatesOutputIteratorT d_aggregates_out,
NumRunsOutputIteratorT d_num_runs_out,
EqualityOpT equality_op,
ReductionOpT reduction_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_unique_out,
d_values_in,
d_aggregates_out,
d_num_runs_out,
equality_op,
reduction_op,
num_items,
stream);
}
};
CUB_NAMESPACE_END
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