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/*
* This file is open source software, licensed to you under the terms
* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. You may not use this file except in compliance with the License.
*
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*
* Copyright (C) 2014 Cloudius Systems, Ltd.
*/
#include <seastar/core/seastar.hh>
#include <seastar/core/app-template.hh>
#include <seastar/core/scattered_message.hh>
#include <seastar/core/vector-data-sink.hh>
#include <seastar/core/shared_ptr.hh>
#include <seastar/core/units.hh>
#include <seastar/core/timer.hh>
#include <seastar/net/api.hh>
#include <random>
#include <iomanip>
#include <iostream>
using namespace seastar;
using namespace net;
using namespace std::chrono_literals;
namespace bpo = boost::program_options;
template <typename Duration>
typename Duration::rep to_seconds(Duration d) {
return std::chrono::duration_cast<std::chrono::seconds>(d).count();
}
class server {
private:
udp_channel _chan;
timer<> _stats_timer;
uint64_t _n_sent {};
size_t _chunk_size;
bool _copy;
std::vector<packet> _packets;
std::unique_ptr<output_stream<char>> _out;
steady_clock_type::time_point _last;
sstring _key;
size_t _packet_size = 8*KB;
char* _mem;
size_t _mem_size;
std::mt19937 _rnd;
std::random_device _randem_dev;
std::uniform_int_distribution<size_t> _chunk_distribution;
private:
char* next_chunk() {
return _mem + _chunk_distribution(_rnd);
}
public:
server()
: _rnd(std::random_device()()) {
}
future<> send(ipv4_addr dst, packet p) {
return _chan.send(dst, std::move(p)).then([this] {
_n_sent++;
});
}
void start(int chunk_size, bool copy, size_t mem_size) {
ipv4_addr listen_addr{10000};
_chan = make_udp_channel(listen_addr);
std::cout << "Listening on " << listen_addr << std::endl;
_last = steady_clock_type::now();
_stats_timer.set_callback([this] {
auto now = steady_clock_type::now();
std::cout << "Out: "
<< std::setprecision(2) << std::fixed
<< (double)_n_sent / to_seconds(now - _last)
<< " pps" << std::endl;
_last = now;
_n_sent = 0;
});
_stats_timer.arm_periodic(1s);
_chunk_size = chunk_size;
_copy = copy;
_key = sstring(new char[64], 64);
_out = std::make_unique<output_stream<char>>(
data_sink(std::make_unique<vector_data_sink>(_packets)), _packet_size);
_mem = new char[mem_size];
_mem_size = mem_size;
_chunk_distribution = std::uniform_int_distribution<size_t>(0, _mem_size - _chunk_size * 3);
assert(3 * _chunk_size <= _packet_size);
// Run sender in background.
(void)keep_doing([this] {
return _chan.receive().then([this] (udp_datagram dgram) {
auto chunk = next_chunk();
lw_shared_ptr<sstring> item;
if (_copy) {
_packets.clear();
// FIXME: future is discarded
(void)_out->write(chunk, _chunk_size);
chunk += _chunk_size;
(void)_out->write(chunk, _chunk_size);
chunk += _chunk_size;
(void)_out->write(chunk, _chunk_size);
(void)_out->flush();
assert(_packets.size() == 1);
return send(dgram.get_src(), std::move(_packets[0]));
} else {
auto chunk = next_chunk();
scattered_message<char> msg;
msg.reserve(3);
msg.append_static(chunk, _chunk_size);
msg.append_static(chunk, _chunk_size);
msg.append_static(chunk, _chunk_size);
return send(dgram.get_src(), std::move(msg).release());
}
});
});
}
};
int main(int ac, char ** av) {
server s;
app_template app;
app.add_options()
("chunk-size", bpo::value<int>()->default_value(1024),
"Chunk size")
("mem-size", bpo::value<int>()->default_value(512),
"Memory pool size in MiB")
("copy", "Copy data rather than send via zero-copy")
;
return app.run_deprecated(ac, av, [&app, &s] {
auto&& config = app.configuration();
auto chunk_size = config["chunk-size"].as<int>();
auto mem_size = (size_t)config["mem-size"].as<int>() * MB;
auto copy = config.count("copy");
s.start(chunk_size, copy, mem_size);
});
}
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