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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2013-2020 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library 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 Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*/
#define BOOST_TEST_MODULE ndn-cxx Encoding Benchmark
#include "tests/boost-test.hpp"
#include "ndn-cxx/encoding/tlv.hpp"
#include "tests/benchmarks/timed-execute.hpp"
#include <boost/mpl/vector.hpp>
#include <boost/mpl/vector_c.hpp>
#include <iostream>
namespace ndn {
namespace tlv {
namespace tests {
using namespace ndn::tests;
template<size_t WIRE_SIZE>
struct ReadVarNumberTest;
template<>
struct ReadVarNumberTest<1>
{
static const uint8_t WIRE[];
static const uint64_t VALUE = 252;
};
const uint8_t ReadVarNumberTest<1>::WIRE[] = {0xfc};
template<>
struct ReadVarNumberTest<3>
{
static const uint8_t WIRE[];
static const uint64_t VALUE = 253;
};
const uint8_t ReadVarNumberTest<3>::WIRE[] = {0xfd, 0x00, 0xfd};
template<>
struct ReadVarNumberTest<5>
{
static const uint8_t WIRE[];
static const uint64_t VALUE = 65536;
};
const uint8_t ReadVarNumberTest<5>::WIRE[] = {0xfe, 0x00, 0x01, 0x00, 0x00};
template<>
struct ReadVarNumberTest<9>
{
static const uint8_t WIRE[];
static const uint64_t VALUE = 4294967296;
};
const uint8_t ReadVarNumberTest<9>::WIRE[] = {0xff, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00};
template<size_t WIRE_SIZE, size_t ALIGNMENT_OFFSET>
struct ReadVarNumberAlignTest : public ReadVarNumberTest<WIRE_SIZE>
{
using AlignmentOffset = std::integral_constant<size_t, ALIGNMENT_OFFSET>;
static_assert(sizeof(ReadVarNumberTest<WIRE_SIZE>::WIRE) == WIRE_SIZE, "");
};
using ReadVarNumberTests = boost::mpl::vector<
ReadVarNumberAlignTest<1, 0>,
ReadVarNumberAlignTest<3, 0>,
ReadVarNumberAlignTest<3, 1>,
ReadVarNumberAlignTest<5, 0>,
ReadVarNumberAlignTest<5, 1>,
ReadVarNumberAlignTest<5, 2>,
ReadVarNumberAlignTest<5, 3>,
ReadVarNumberAlignTest<9, 0>,
ReadVarNumberAlignTest<9, 1>,
ReadVarNumberAlignTest<9, 2>,
ReadVarNumberAlignTest<9, 3>,
ReadVarNumberAlignTest<9, 4>,
ReadVarNumberAlignTest<9, 5>,
ReadVarNumberAlignTest<9, 6>,
ReadVarNumberAlignTest<9, 7>
>;
// Benchmark of ndn::tlv::readVarNumber with different number lengths and alignments.
// For accurate results, it is required to compile ndn-cxx in release mode.
// It is recommended to run the benchmark multiple times and take the average.
BOOST_AUTO_TEST_CASE_TEMPLATE(ReadVarNumber, Test, ReadVarNumberTests)
{
const int N_ITERATIONS = 100000000;
alignas(8) uint8_t buffer[16];
static_assert(Test::AlignmentOffset::value + sizeof(Test::WIRE) <= sizeof(buffer), "");
uint8_t* const begin = buffer + Test::AlignmentOffset::value;
std::memcpy(begin, Test::WIRE, sizeof(Test::WIRE));
const uint8_t* const end = begin + sizeof(Test::WIRE);
int nOks = 0;
int nCorrects = 0;
auto d = timedExecute([&] {
uint64_t number = 0;
for (int i = 0; i < N_ITERATIONS; ++i) {
const uint8_t* begin2 = begin; // make a copy because readVarNumber increments the pointer
nOks += readVarNumber(begin2, end, number);
nCorrects += number == Test::VALUE;
// use the number and the return value, so compiler won't optimize out their computation
}
});
BOOST_CHECK_EQUAL(nOks, N_ITERATIONS);
BOOST_CHECK_EQUAL(nCorrects, N_ITERATIONS);
std::cout << "size=" << sizeof(Test::WIRE)
<< " offset=" << Test::AlignmentOffset::value
<< " " << d << std::endl;
}
} // namespace tests
} // namespace tlv
} // namespace ndn