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/*
* Hash benchmark module
* Part of the xxHash project
* Copyright (C) 2019-2020 Yann Collet
*
* GPL v2 License
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* You can contact the author at:
* - xxHash homepage: https://www.xxhash.com
* - xxHash source repository: https://github.com/Cyan4973/xxHash
*/
/* benchmark hash functions */
#include <stdlib.h> // malloc
#include <assert.h>
#include "benchHash.h"
static void initBuffer(void* buffer, size_t size)
{
const unsigned long long k1 = 11400714785074694791ULL; /* 0b1001111000110111011110011011000110000101111010111100101010000111 */
const unsigned long long k2 = 14029467366897019727ULL; /* 0b1100001010110010101011100011110100100111110101001110101101001111 */
unsigned long long acc = k2;
unsigned char* const p = (unsigned char*)buffer;
for (size_t s = 0; s < size; s++) {
acc *= k1;
p[s] = (unsigned char)(acc >> 56);
}
}
#define MARGIN_FOR_LATENCY 1024
#define START_MASK (MARGIN_FOR_LATENCY-1)
typedef size_t (*sizeFunction_f)(size_t targetSize);
/*
* bench_hash_internal():
* Benchmarks hashfn repeateadly over single input of size `size`
* return: nb of hashes per second
*/
static double
bench_hash_internal(BMK_benchFn_t hashfn, void* payload,
size_t nbBlocks, sizeFunction_f selectSize, size_t size,
unsigned total_time_ms, unsigned iter_time_ms)
{
BMK_timedFnState_shell shell;
BMK_timedFnState_t* const txf = BMK_initStatic_timedFnState(&shell, sizeof(shell), total_time_ms, iter_time_ms);
assert(txf != NULL);
size_t const srcSize = (size_t)size;
size_t const srcBufferSize = srcSize + MARGIN_FOR_LATENCY;
void* const srcBuffer = malloc(srcBufferSize);
assert(srcBuffer != NULL);
initBuffer(srcBuffer, srcBufferSize);
#define FAKE_DSTSIZE 32
size_t const dstSize = FAKE_DSTSIZE;
char dstBuffer_static[FAKE_DSTSIZE] = {0};
#define NB_BLOCKS_MAX 1024
const void* srcBuffers[NB_BLOCKS_MAX];
size_t srcSizes[NB_BLOCKS_MAX];
void* dstBuffers[NB_BLOCKS_MAX];
size_t dstCapacities[NB_BLOCKS_MAX];
assert(nbBlocks < NB_BLOCKS_MAX);
assert(size > 0);
for (size_t n=0; n < nbBlocks; n++) {
srcBuffers[n] = srcBuffer;
srcSizes[n] = selectSize(size);
dstBuffers[n] = dstBuffer_static;
dstCapacities[n] = dstSize;
}
BMK_benchParams_t params = {
.benchFn = hashfn,
.benchPayload = payload,
.initFn = NULL,
.initPayload = NULL,
.errorFn = NULL,
.blockCount = nbBlocks,
.srcBuffers = srcBuffers,
.srcSizes = srcSizes,
.dstBuffers = dstBuffers,
.dstCapacities = dstCapacities,
.blockResults = NULL
};
BMK_runOutcome_t result;
while (!BMK_isCompleted_TimedFn(txf)) {
result = BMK_benchTimedFn(txf, params);
assert(BMK_isSuccessful_runOutcome(result));
}
BMK_runTime_t const runTime = BMK_extract_runTime(result);
free(srcBuffer);
assert(runTime.nanoSecPerRun != 0);
return (1000000000U / runTime.nanoSecPerRun) * nbBlocks;
}
static size_t rand_1_N(size_t N) { return ((size_t)rand() % N) + 1; }
static size_t identity(size_t s) { return s; }
static size_t
benchLatency(const void* src, size_t srcSize,
void* dst, size_t dstCapacity,
void* customPayload)
{
(void)dst; (void)dstCapacity;
BMK_benchFn_t benchfn = (BMK_benchFn_t)customPayload;
static size_t hash = 0;
const void* const start = (const char*)src + (hash & START_MASK);
return hash = benchfn(start, srcSize, dst, dstCapacity, NULL);
}
#ifndef SIZE_TO_HASH_PER_ROUND
# define SIZE_TO_HASH_PER_ROUND 200000
#endif
#ifndef NB_HASH_ROUNDS_MAX
# define NB_HASH_ROUNDS_MAX 1000
#endif
double bench_hash(BMK_benchFn_t hashfn,
BMK_benchMode benchMode,
size_t size, BMK_sizeMode sizeMode,
unsigned total_time_ms, unsigned iter_time_ms)
{
sizeFunction_f const sizef = (sizeMode == BMK_fixedSize) ? identity : rand_1_N;
BMK_benchFn_t const benchfn = (benchMode == BMK_throughput) ? hashfn : benchLatency;
BMK_benchFn_t const payload = (benchMode == BMK_throughput) ? NULL : hashfn;
size_t nbBlocks = (SIZE_TO_HASH_PER_ROUND / size) + 1;
if (nbBlocks > NB_HASH_ROUNDS_MAX) nbBlocks = NB_HASH_ROUNDS_MAX;
return bench_hash_internal(benchfn, payload,
nbBlocks, sizef, size,
total_time_ms, iter_time_ms);
}
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