Files
scylladb/test/perf/perf_hash.cc
Avi Kivity fcb8d040e8 treewide: use Software Package Data Exchange (SPDX) license identifiers
Instead of lengthy blurbs, switch to single-line, machine-readable
standardized (https://spdx.dev) license identifiers. The Linux kernel
switched long ago, so there is strong precedent.

Three cases are handled: AGPL-only, Apache-only, and dual licensed.
For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0),
reasoning that our changes are extensive enough to apply our license.

The changes we applied mechanically with a script, except to
licenses/README.md.

Closes #9937
2022-01-18 12:15:18 +01:00

40 lines
822 B
C++

/*
* Copyright (C) 2015-present ScyllaDB
*/
/*
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include "utils/murmur_hash.hh"
#include "test/perf/perf.hh"
volatile uint64_t black_hole;
int main(int argc, char* argv[]) {
const uint64_t seed = 0;
auto src = bytes("0123412308129301923019283056789012345");
uint64_t sink = 0;
std::cout << "Timing fixed hash...\n";
time_it([&] {
std::array<uint64_t,2> dst;
utils::murmur_hash::hash3_x64_128(src, seed, dst);
sink += dst[0];
sink += dst[1];
});
std::cout << "Timing iterator hash...\n";
time_it([&] {
std::array<uint64_t,2> dst;
utils::murmur_hash::hash3_x64_128(src.begin(), src.size(), seed, dst);
sink += dst[0];
sink += dst[1];
});
black_hole = sink;
}