mirror of
https://github.com/NVIDIA/cuda-samples.git
synced 2024-11-24 20:39:17 +08:00
277 lines
11 KiB
Plaintext
277 lines
11 KiB
Plaintext
/* Copyright (c) 2021, 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 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 ``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 THE COPYRIGHT OWNER OR
|
|
* CONTRIBUTORS 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.
|
|
*/
|
|
|
|
//Based on http://www.iti.fh-flensburg.de/lang/algorithmen/sortieren/bitonic/bitonicen.htm
|
|
|
|
#include <assert.h>
|
|
#include <cooperative_groups.h>
|
|
|
|
namespace cg = cooperative_groups;
|
|
#include <helper_cuda.h>
|
|
#include "sortingNetworks_common.h"
|
|
#include "sortingNetworks_common.cuh"
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Monolithic bitonic sort kernel for short arrays fitting into shared memory
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
__global__ void bitonicSortShared(uint *d_DstKey, uint *d_DstVal,
|
|
uint *d_SrcKey, uint *d_SrcVal,
|
|
uint arrayLength, uint dir) {
|
|
// Handle to thread block group
|
|
cg::thread_block cta = cg::this_thread_block();
|
|
// Shared memory storage for one or more short vectors
|
|
__shared__ uint s_key[SHARED_SIZE_LIMIT];
|
|
__shared__ uint s_val[SHARED_SIZE_LIMIT];
|
|
|
|
// Offset to the beginning of subbatch and load data
|
|
d_SrcKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
d_SrcVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
d_DstKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
d_DstVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
s_key[threadIdx.x + 0] = d_SrcKey[0];
|
|
s_val[threadIdx.x + 0] = d_SrcVal[0];
|
|
s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] =
|
|
d_SrcKey[(SHARED_SIZE_LIMIT / 2)];
|
|
s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] =
|
|
d_SrcVal[(SHARED_SIZE_LIMIT / 2)];
|
|
|
|
for (uint size = 2; size < arrayLength; size <<= 1) {
|
|
// Bitonic merge
|
|
uint ddd = dir ^ ((threadIdx.x & (size / 2)) != 0);
|
|
|
|
for (uint stride = size / 2; stride > 0; stride >>= 1) {
|
|
cg::sync(cta);
|
|
uint pos = 2 * threadIdx.x - (threadIdx.x & (stride - 1));
|
|
Comparator(s_key[pos + 0], s_val[pos + 0], s_key[pos + stride],
|
|
s_val[pos + stride], ddd);
|
|
}
|
|
}
|
|
|
|
// ddd == dir for the last bitonic merge step
|
|
{
|
|
for (uint stride = arrayLength / 2; stride > 0; stride >>= 1) {
|
|
cg::sync(cta);
|
|
uint pos = 2 * threadIdx.x - (threadIdx.x & (stride - 1));
|
|
Comparator(s_key[pos + 0], s_val[pos + 0], s_key[pos + stride],
|
|
s_val[pos + stride], dir);
|
|
}
|
|
}
|
|
|
|
cg::sync(cta);
|
|
d_DstKey[0] = s_key[threadIdx.x + 0];
|
|
d_DstVal[0] = s_val[threadIdx.x + 0];
|
|
d_DstKey[(SHARED_SIZE_LIMIT / 2)] =
|
|
s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
|
|
d_DstVal[(SHARED_SIZE_LIMIT / 2)] =
|
|
s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Bitonic sort kernel for large arrays (not fitting into shared memory)
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Bottom-level bitonic sort
|
|
// Almost the same as bitonicSortShared with the exception of
|
|
// even / odd subarrays being sorted in opposite directions
|
|
// Bitonic merge accepts both
|
|
// Ascending | descending or descending | ascending sorted pairs
|
|
__global__ void bitonicSortShared1(uint *d_DstKey, uint *d_DstVal,
|
|
uint *d_SrcKey, uint *d_SrcVal) {
|
|
// Handle to thread block group
|
|
cg::thread_block cta = cg::this_thread_block();
|
|
// Shared memory storage for current subarray
|
|
__shared__ uint s_key[SHARED_SIZE_LIMIT];
|
|
__shared__ uint s_val[SHARED_SIZE_LIMIT];
|
|
|
|
// Offset to the beginning of subarray and load data
|
|
d_SrcKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
d_SrcVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
d_DstKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
d_DstVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
s_key[threadIdx.x + 0] = d_SrcKey[0];
|
|
s_val[threadIdx.x + 0] = d_SrcVal[0];
|
|
s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] =
|
|
d_SrcKey[(SHARED_SIZE_LIMIT / 2)];
|
|
s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] =
|
|
d_SrcVal[(SHARED_SIZE_LIMIT / 2)];
|
|
|
|
for (uint size = 2; size < SHARED_SIZE_LIMIT; size <<= 1) {
|
|
// Bitonic merge
|
|
uint ddd = (threadIdx.x & (size / 2)) != 0;
|
|
|
|
for (uint stride = size / 2; stride > 0; stride >>= 1) {
|
|
cg::sync(cta);
|
|
uint pos = 2 * threadIdx.x - (threadIdx.x & (stride - 1));
|
|
Comparator(s_key[pos + 0], s_val[pos + 0], s_key[pos + stride],
|
|
s_val[pos + stride], ddd);
|
|
}
|
|
}
|
|
|
|
// Odd / even arrays of SHARED_SIZE_LIMIT elements
|
|
// sorted in opposite directions
|
|
uint ddd = blockIdx.x & 1;
|
|
{
|
|
for (uint stride = SHARED_SIZE_LIMIT / 2; stride > 0; stride >>= 1) {
|
|
cg::sync(cta);
|
|
uint pos = 2 * threadIdx.x - (threadIdx.x & (stride - 1));
|
|
Comparator(s_key[pos + 0], s_val[pos + 0], s_key[pos + stride],
|
|
s_val[pos + stride], ddd);
|
|
}
|
|
}
|
|
|
|
cg::sync(cta);
|
|
d_DstKey[0] = s_key[threadIdx.x + 0];
|
|
d_DstVal[0] = s_val[threadIdx.x + 0];
|
|
d_DstKey[(SHARED_SIZE_LIMIT / 2)] =
|
|
s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
|
|
d_DstVal[(SHARED_SIZE_LIMIT / 2)] =
|
|
s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
|
|
}
|
|
|
|
// Bitonic merge iteration for stride >= SHARED_SIZE_LIMIT
|
|
__global__ void bitonicMergeGlobal(uint *d_DstKey, uint *d_DstVal,
|
|
uint *d_SrcKey, uint *d_SrcVal,
|
|
uint arrayLength, uint size, uint stride,
|
|
uint dir) {
|
|
uint global_comparatorI = blockIdx.x * blockDim.x + threadIdx.x;
|
|
uint comparatorI = global_comparatorI & (arrayLength / 2 - 1);
|
|
|
|
// Bitonic merge
|
|
uint ddd = dir ^ ((comparatorI & (size / 2)) != 0);
|
|
uint pos = 2 * global_comparatorI - (global_comparatorI & (stride - 1));
|
|
|
|
uint keyA = d_SrcKey[pos + 0];
|
|
uint valA = d_SrcVal[pos + 0];
|
|
uint keyB = d_SrcKey[pos + stride];
|
|
uint valB = d_SrcVal[pos + stride];
|
|
|
|
Comparator(keyA, valA, keyB, valB, ddd);
|
|
|
|
d_DstKey[pos + 0] = keyA;
|
|
d_DstVal[pos + 0] = valA;
|
|
d_DstKey[pos + stride] = keyB;
|
|
d_DstVal[pos + stride] = valB;
|
|
}
|
|
|
|
// Combined bitonic merge steps for
|
|
// size > SHARED_SIZE_LIMIT and stride = [1 .. SHARED_SIZE_LIMIT / 2]
|
|
__global__ void bitonicMergeShared(uint *d_DstKey, uint *d_DstVal,
|
|
uint *d_SrcKey, uint *d_SrcVal,
|
|
uint arrayLength, uint size, uint dir) {
|
|
// Handle to thread block group
|
|
cg::thread_block cta = cg::this_thread_block();
|
|
// Shared memory storage for current subarray
|
|
__shared__ uint s_key[SHARED_SIZE_LIMIT];
|
|
__shared__ uint s_val[SHARED_SIZE_LIMIT];
|
|
|
|
d_SrcKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
d_SrcVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
d_DstKey += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
d_DstVal += blockIdx.x * SHARED_SIZE_LIMIT + threadIdx.x;
|
|
s_key[threadIdx.x + 0] = d_SrcKey[0];
|
|
s_val[threadIdx.x + 0] = d_SrcVal[0];
|
|
s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] =
|
|
d_SrcKey[(SHARED_SIZE_LIMIT / 2)];
|
|
s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)] =
|
|
d_SrcVal[(SHARED_SIZE_LIMIT / 2)];
|
|
|
|
// Bitonic merge
|
|
uint comparatorI =
|
|
UMAD(blockIdx.x, blockDim.x, threadIdx.x) & ((arrayLength / 2) - 1);
|
|
uint ddd = dir ^ ((comparatorI & (size / 2)) != 0);
|
|
|
|
for (uint stride = SHARED_SIZE_LIMIT / 2; stride > 0; stride >>= 1) {
|
|
cg::sync(cta);
|
|
uint pos = 2 * threadIdx.x - (threadIdx.x & (stride - 1));
|
|
Comparator(s_key[pos + 0], s_val[pos + 0], s_key[pos + stride],
|
|
s_val[pos + stride], ddd);
|
|
}
|
|
|
|
cg::sync(cta);
|
|
d_DstKey[0] = s_key[threadIdx.x + 0];
|
|
d_DstVal[0] = s_val[threadIdx.x + 0];
|
|
d_DstKey[(SHARED_SIZE_LIMIT / 2)] =
|
|
s_key[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
|
|
d_DstVal[(SHARED_SIZE_LIMIT / 2)] =
|
|
s_val[threadIdx.x + (SHARED_SIZE_LIMIT / 2)];
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Interface function
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Helper function (also used by odd-even merge sort)
|
|
extern "C" uint factorRadix2(uint *log2L, uint L) {
|
|
if (!L) {
|
|
*log2L = 0;
|
|
return 0;
|
|
} else {
|
|
for (*log2L = 0; (L & 1) == 0; L >>= 1, *log2L++)
|
|
;
|
|
|
|
return L;
|
|
}
|
|
}
|
|
|
|
extern "C" uint bitonicSort(uint *d_DstKey, uint *d_DstVal, uint *d_SrcKey,
|
|
uint *d_SrcVal, uint batchSize, uint arrayLength,
|
|
uint dir) {
|
|
// Nothing to sort
|
|
if (arrayLength < 2) return 0;
|
|
|
|
// Only power-of-two array lengths are supported by this implementation
|
|
uint log2L;
|
|
uint factorizationRemainder = factorRadix2(&log2L, arrayLength);
|
|
assert(factorizationRemainder == 1);
|
|
|
|
dir = (dir != 0);
|
|
|
|
uint blockCount = batchSize * arrayLength / SHARED_SIZE_LIMIT;
|
|
uint threadCount = SHARED_SIZE_LIMIT / 2;
|
|
|
|
if (arrayLength <= SHARED_SIZE_LIMIT) {
|
|
assert((batchSize * arrayLength) % SHARED_SIZE_LIMIT == 0);
|
|
bitonicSortShared<<<blockCount, threadCount>>>(d_DstKey, d_DstVal, d_SrcKey,
|
|
d_SrcVal, arrayLength, dir);
|
|
} else {
|
|
bitonicSortShared1<<<blockCount, threadCount>>>(d_DstKey, d_DstVal,
|
|
d_SrcKey, d_SrcVal);
|
|
|
|
for (uint size = 2 * SHARED_SIZE_LIMIT; size <= arrayLength; size <<= 1)
|
|
for (unsigned stride = size / 2; stride > 0; stride >>= 1)
|
|
if (stride >= SHARED_SIZE_LIMIT) {
|
|
bitonicMergeGlobal<<<(batchSize * arrayLength) / 512, 256>>>(
|
|
d_DstKey, d_DstVal, d_DstKey, d_DstVal, arrayLength, size, stride,
|
|
dir);
|
|
} else {
|
|
bitonicMergeShared<<<blockCount, threadCount>>>(
|
|
d_DstKey, d_DstVal, d_DstKey, d_DstVal, arrayLength, size, dir);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return threadCount;
|
|
}
|