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Diffstat (limited to 'host/examples/benchmark_rx_rate.cpp')
| -rw-r--r-- | host/examples/benchmark_rx_rate.cpp | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/host/examples/benchmark_rx_rate.cpp b/host/examples/benchmark_rx_rate.cpp new file mode 100644 index 000000000..50af1b98b --- /dev/null +++ b/host/examples/benchmark_rx_rate.cpp @@ -0,0 +1,167 @@ +// +// Copyright 2010-2011 Ettus Research LLC +// +// 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 3 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, see <http://www.gnu.org/licenses/>. +// + +#include <uhd/utils/thread_priority.hpp> +#include <uhd/utils/safe_main.hpp> +#include <uhd/usrp/multi_usrp.hpp> +#include <boost/math/special_functions/round.hpp> +#include <boost/program_options.hpp> +#include <boost/format.hpp> +#include <iostream> +#include <complex> + +namespace po = boost::program_options; + +static inline void test_device( + uhd::usrp::multi_usrp::sptr usrp, + double rx_rate_sps, + double duration_secs +){ + const size_t max_samps_per_packet = usrp->get_device()->get_max_recv_samps_per_packet(); + std::cout << boost::format("Testing receive rate %f Msps (%f second run)") % (rx_rate_sps/1e6) % duration_secs << std::endl; + + //allocate recv buffer and metatdata + uhd::rx_metadata_t md; + std::vector<std::complex<float> > buff(max_samps_per_packet); + + //flush the buffers in the recv path + while(usrp->get_device()->recv( + &buff.front(), buff.size(), md, + uhd::io_type_t::COMPLEX_FLOAT32, + uhd::device::RECV_MODE_ONE_PACKET + )){ + /* NOP */ + }; + + //declare status variables + bool got_first_packet = false; + size_t total_recv_packets = 0; + size_t total_lost_samples = 0; + size_t total_recv_samples = 0; + uhd::time_spec_t initial_time_spec; + uhd::time_spec_t next_expected_time_spec; + + usrp->issue_stream_cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS); + do { + size_t num_rx_samps = usrp->get_device()->recv( + &buff.front(), buff.size(), md, + uhd::io_type_t::COMPLEX_FLOAT32, + uhd::device::RECV_MODE_ONE_PACKET + ); + + //handle the error codes + switch(md.error_code){ + case uhd::rx_metadata_t::ERROR_CODE_NONE: + case uhd::rx_metadata_t::ERROR_CODE_OVERFLOW: + break; + + default: + std::cerr << "Error code: " << md.error_code << std::endl; + std::cerr << "Unexpected error on recv, exit test..." << std::endl; + return; + } + + if (not md.has_time_spec){ + std::cerr << "Metadata missing time spec, exit test..." << std::endl; + return; + } + + total_recv_samples += num_rx_samps; + total_recv_packets++; + + if (not got_first_packet){ + initial_time_spec = md.time_spec; + next_expected_time_spec = initial_time_spec; + got_first_packet = true; + } + + double approx_lost_samps = rx_rate_sps*(md.time_spec - next_expected_time_spec).get_real_secs(); + total_lost_samples += std::max(0, boost::math::iround(approx_lost_samps)); + next_expected_time_spec = md.time_spec + uhd::time_spec_t(0, num_rx_samps, rx_rate_sps); + + } while((next_expected_time_spec - initial_time_spec) < uhd::time_spec_t(duration_secs)); + usrp->issue_stream_cmd(uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS); + + //print a summary + std::cout << std::endl; //go to newline, recv may spew SXSYSZ... + std::cout << boost::format(" Received packets: %d") % total_recv_packets << std::endl; + std::cout << boost::format(" Received samples: %d") % total_recv_samples << std::endl; + std::cout << boost::format(" Lost samples: %d") % total_lost_samples << std::endl; + size_t packets_lost = boost::math::iround(double(total_lost_samples)/max_samps_per_packet); + std::cout << boost::format(" Lost packets: %d (approximate)") % packets_lost << std::endl; + double actual_rx_rate_sps = (total_recv_samples*rx_rate_sps)/(total_recv_samples+total_lost_samples); + std::cout << boost::format(" Sustained receive rate: %f Msps") % (actual_rx_rate_sps/1e6) << std::endl; + std::cout << std::endl << std::endl; +} + +int UHD_SAFE_MAIN(int argc, char *argv[]){ + uhd::set_thread_priority_safe(); + + //variables to be set by po + std::string args; + double duration; + double rate; + + //setup the program options + po::options_description desc("Allowed options"); + desc.add_options() + ("help", "help message") + ("args", po::value<std::string>(&args)->default_value(""), "single uhd device address args") + ("duration", po::value<double>(&duration)->default_value(10.0), "duration for each test in seconds") + ("rate", po::value<double>(&rate), "specify to perform a single test as this rate (sps)") + ; + po::variables_map vm; + po::store(po::parse_command_line(argc, argv, desc), vm); + po::notify(vm); + + //print the help message + if (vm.count("help")){ + std::cout << boost::format("UHD Benchmark RX Rate %s") % desc << std::endl; + return ~0; + } + + //verify that rate was specified + if (not vm.count("rate")){ + std::cerr << "Please specify the sample rate with --rate" << std::endl; + return ~0; + } + + //create a usrp device + std::cout << std::endl; + uhd::device_addrs_t device_addrs = uhd::device::find(args); + if (device_addrs.empty()){ + std::cerr << "Could not find any devices for: " << args << std::endl; + return ~0; + } + if (device_addrs.at(0).get("type", "") == "usrp1"){ + std::cerr << "*** Warning! ***" << std::endl; + std::cerr << "Benchmark RX results will be inaccurate on USRP1 due to soft-time control.\n" << std::endl; + } + std::cout << boost::format("Creating the usrp device with: %s...") % args << std::endl; + uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(device_addrs.at(0)); + std::cout << boost::format("Using Device: %s") % usrp->get_pp_string() << std::endl; + + //start the test + usrp->set_rx_rate(rate); + rate = usrp->get_rx_rate(); + test_device(usrp, rate, duration); + + //finished + std::cout << std::endl << "Done!" << std::endl << std::endl; + + return 0; +} |