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//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//
#include <boost/beast/core/buffers_range.hpp>
#include <boost/beast/core/flat_buffer.hpp>
#include <boost/beast/core/multi_buffer.hpp>
#include <boost/beast/core/read_size.hpp>
#include <boost/beast/core/string.hpp>
#include <boost/beast/_experimental/unit_test/suite.hpp>
#include <boost/asio/streambuf.hpp>
#include <algorithm>
#include <chrono>
#include <cstdlib>
#include <iomanip>
#include <utility>
#include <vector>
namespace boost {
namespace beast {
class buffers_test : public beast::unit_test::suite
{
public:
using size_type = std::uint64_t;
class timer
{
using clock_type =
std::chrono::system_clock;
clock_type::time_point when_;
public:
using duration =
clock_type::duration;
timer()
: when_(clock_type::now())
{
}
duration
elapsed() const
{
return clock_type::now() - when_;
}
};
inline
size_type
throughput(std::chrono::duration<
double> const& elapsed, size_type items)
{
using namespace std::chrono;
return static_cast<size_type>(
1 / (elapsed/items).count());
}
template<class MutableBufferSequence>
static
std::size_t
fill(MutableBufferSequence const& buffers)
{
std::size_t n = 0;
for(auto b : beast::buffers_range_ref(buffers))
{
std::fill(
static_cast<char*>(b.data()),
static_cast<char*>(b.data()) +
b.size(), '\0');
n += b.size();
}
return n;
}
template<class DynamicBuffer>
size_type
do_prepares(std::size_t repeat,
std::size_t count, std::size_t size)
{
timer t;
size_type total = 0;
for(auto i = repeat; i--;)
{
DynamicBuffer b;
for(auto j = count; j--;)
{
auto const n = fill(b.prepare(size));
b.commit(n);
total += n;
}
}
return throughput(t.elapsed(), total);
}
template<class DynamicBuffer>
size_type
do_hints(std::size_t repeat,
std::size_t count, std::size_t size)
{
timer t;
size_type total = 0;
for(auto i = repeat; i--;)
{
DynamicBuffer b;
for(auto j = count; j--;)
{
for(auto remain = size; remain;)
{
auto const n = fill(b.prepare(
read_size(b, remain)));
b.commit(n);
remain -= n;
total += n;
}
}
}
return throughput(t.elapsed(), total);
}
template<class DynamicBuffer>
size_type
do_random(std::size_t repeat,
std::size_t count, std::size_t size)
{
timer t;
size_type total = 0;
for(auto i = repeat; i--;)
{
DynamicBuffer b;
for(auto j = count; j--;)
{
auto const n = fill(b.prepare(
1 + (rand()%(2*size))));
b.commit(n);
total += n;
}
}
return throughput(t.elapsed(), total);
}
static
inline
void
do_trials_1(bool)
{
}
template<class F0, class... FN>
void
do_trials_1(bool print, F0&& f, FN... fn)
{
timer t;
using namespace std::chrono;
static size_type constexpr den = 1024 * 1024;
if(print)
{
log << std::right << std::setw(10) <<
((f() + (den / 2)) / den) << " MB/s";
log.flush();
}
else
{
f();
}
do_trials_1(print, fn...);
}
template<class F0, class... FN>
void
do_trials(string_view name,
std::size_t trials, F0&& f0, FN... fn)
{
using namespace std::chrono;
// warm-up
do_trials_1(false, f0, fn...);
do_trials_1(false, f0, fn...);
while(trials--)
{
timer t;
log << std::left << std::setw(24) << name << ":";
log.flush();
do_trials_1(true, f0, fn...);
log << " " <<
duration_cast<milliseconds>(t.elapsed()).count() << "ms";
log << std::endl;
}
}
void
run() override
{
static std::size_t constexpr trials = 1;
static std::size_t constexpr repeat = 250;
std::vector<std::pair<std::size_t, std::size_t>> params;
params.emplace_back(1024, 1024);
params.emplace_back(512, 4096);
params.emplace_back(256, 32768);
log << std::endl;
for(auto const& param : params)
{
auto const count = param.first;
auto const size = param.second;
auto const s = std::string("count=") + std::to_string(count) +
", size=" + std::to_string(size);
log << std::left << std::setw(24) << s << " " <<
std::right << std::setw(15) << "prepare" <<
std::right << std::setw(15) << "with hint" <<
std::right << std::setw(15) << "random" <<
std::endl;
do_trials("multi_buffer", trials,
[&](){ return do_prepares<multi_buffer>(repeat, count, size); }
,[&](){ return do_hints <multi_buffer>(repeat, count, size); }
,[&](){ return do_random <multi_buffer>(repeat, count, size); }
);
do_trials("flat_buffer", trials,
[&](){ return do_prepares<flat_buffer>(repeat, count, size); }
,[&](){ return do_hints <flat_buffer>(repeat, count, size); }
,[&](){ return do_random <flat_buffer>(repeat, count, size); }
);
do_trials("net::streambuf", trials,
[&](){ return do_prepares<net::streambuf>(repeat, count, size); }
,[&](){ return do_hints <net::streambuf>(repeat, count, size); }
,[&](){ return do_random <net::streambuf>(repeat, count, size); }
);
log << std::endl;
}
pass();
}
};
BEAST_DEFINE_TESTSUITE(beast,benchmarks,buffers);
} // beast
} // boost
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