forked from NVIDIA/cub
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
1 parent
4f2a61e
commit f7fc66e
Showing
1 changed file
with
168 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,168 @@ | ||
/****************************************************************************** | ||
* Copyright (c) 2011-2023, 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. | ||
* | ||
******************************************************************************/ | ||
|
||
#undef NDEBUG | ||
#include <cub/device/device_scan.cuh> | ||
|
||
#include <thrust/device_vector.h> | ||
#include <thrust/host_vector.h> | ||
|
||
#include <cassert> | ||
|
||
// Has to go after all cub headers. Otherwise, this test won't catch unused | ||
// variables in cub kernels. | ||
#include "catch2_test_helper.h" | ||
|
||
template <class ScanTileStateT> | ||
__global__ void init_kernel(ScanTileStateT tile_state, int blocks_in_grid) | ||
{ | ||
tile_state.InitializeStatus(blocks_in_grid); | ||
} | ||
|
||
template <class MessageT> | ||
__global__ void decoupled_look_back_kernel(cub::ScanTileState<MessageT> tile_state, | ||
MessageT *tile_data) | ||
{ | ||
using scan_op_t = cub::Sum; | ||
using scan_tile_state_t = cub::ScanTileState<MessageT>; | ||
using tile_prefix_op = cub::TilePrefixCallbackOp<MessageT, scan_op_t, scan_tile_state_t>; | ||
using temp_storage_t = typename tile_prefix_op::TempStorage; | ||
|
||
// Allocate temp storage in shared memory | ||
__shared__ temp_storage_t temp_storage; | ||
|
||
scan_op_t scan_op{}; | ||
const unsigned int threads_in_warp = 32; | ||
const unsigned int tid = threadIdx.x; | ||
|
||
// Construct prefix op | ||
tile_prefix_op prefix(tile_state, temp_storage, scan_op); | ||
const unsigned int tile_idx = prefix.GetTileIdx(); | ||
|
||
// "Compute" tile aggregate | ||
MessageT tile_aggregate = tile_data[tile_idx]; | ||
|
||
if (tile_idx == 0) | ||
{ | ||
// There are no blocks to look back to, immediately set the inclusive state | ||
if (tid == 0) | ||
{ | ||
tile_state.SetInclusive(tile_idx, tile_aggregate); | ||
tile_data[tile_idx] = tile_aggregate; | ||
} | ||
} | ||
else | ||
{ | ||
// Only the first warp in the block can perform the look back | ||
const unsigned int warp_id = tid / threads_in_warp; | ||
|
||
if (warp_id == 0) | ||
{ | ||
// Perform the decoupled look-back | ||
// Invocation of the prefix will block until the look-back is complete. | ||
MessageT exclusive_prefix = prefix(tile_aggregate); | ||
|
||
if (tid == 0) | ||
{ | ||
MessageT inclusive_prefix = scan_op(exclusive_prefix, tile_aggregate); | ||
tile_data[tile_idx] = inclusive_prefix; | ||
} | ||
} | ||
__syncthreads(); | ||
|
||
assert(tile_data[tile_idx] == prefix.GetInclusivePrefix()); | ||
assert(tile_aggregate == prefix.GetBlockAggregate()); | ||
} | ||
} | ||
|
||
using message_types = c2h::type_list<std::uint8_t, std::uint16_t, std::uint32_t, std::uint64_t>; | ||
|
||
template <class MessageT> | ||
thrust::host_vector<MessageT> | ||
compute_reference(const thrust::device_vector<MessageT> &tile_aggregates) | ||
{ | ||
if (tile_aggregates.empty()) | ||
{ | ||
return {}; | ||
} | ||
|
||
thrust::host_vector<MessageT> reference = tile_aggregates; | ||
MessageT *h_reference = thrust::raw_pointer_cast(reference.data()); | ||
|
||
MessageT aggregate = h_reference[0]; | ||
for (std::size_t i = 1; i < reference.size(); i++) | ||
{ | ||
aggregate += h_reference[i]; | ||
h_reference[i] = aggregate; | ||
} | ||
|
||
return reference; | ||
} | ||
|
||
CUB_TEST("Decoupled look-back works with various message types", | ||
"[decoupled look-back][device]", | ||
message_types) | ||
{ | ||
using message_t = typename c2h::get<0, TestType>; | ||
using scan_tile_state_t = cub::ScanTileState<message_t>; | ||
|
||
const int max_tiles = 1024 * 1024; | ||
const int num_tiles = GENERATE_COPY(take(10, random(1, max_tiles))); | ||
|
||
thrust::device_vector<message_t> tile_data(num_tiles); | ||
message_t *d_tile_data = thrust::raw_pointer_cast(tile_data.data()); | ||
|
||
c2h::gen(CUB_SEED(2), tile_data); | ||
thrust::host_vector<message_t> reference = compute_reference(tile_data); | ||
|
||
// Query temporary storage requirements | ||
std::size_t temp_storage_bytes{}; | ||
scan_tile_state_t::AllocationSize(num_tiles, temp_storage_bytes); | ||
|
||
// Allocate temporary storage | ||
thrust::device_vector<std::uint8_t> temp_storage(temp_storage_bytes); | ||
std::uint8_t *d_temp_storage = thrust::raw_pointer_cast(temp_storage.data()); | ||
|
||
// Initialize temporary storage | ||
scan_tile_state_t tile_status; | ||
cudaError_t status = tile_status.Init(num_tiles, d_temp_storage, temp_storage_bytes); | ||
REQUIRE(status == cudaSuccess); | ||
|
||
const unsigned int threads_in_init_block = 256; | ||
const unsigned int blocks_in_init_grid = cub::DivideAndRoundUp(num_tiles, threads_in_init_block); | ||
init_kernel<<<blocks_in_init_grid, threads_in_init_block>>>(tile_status, num_tiles); | ||
REQUIRE(cudaSuccess == cudaPeekAtLastError()); | ||
REQUIRE(cudaSuccess == cudaDeviceSynchronize()); | ||
|
||
// Launch decoupled look-back | ||
const unsigned int threads_in_block = 256; | ||
decoupled_look_back_kernel<<<num_tiles, threads_in_block>>>(tile_status, d_tile_data); | ||
REQUIRE(cudaSuccess == cudaPeekAtLastError()); | ||
REQUIRE(cudaSuccess == cudaDeviceSynchronize()); | ||
|
||
REQUIRE(reference == tile_data); | ||
} |