mirror of
https://github.com/gnss-sdr/gnss-sdr
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70 lines
2.9 KiB
C++
70 lines
2.9 KiB
C++
/*!
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* \file fft_speed_test.cc
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* \brief This file implements timing tests for the Armadillo
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* and GNU Radio FFT implementations
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* \author Antonio Ramos, 2017. antonio.ramos(at)cttc.es
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*
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*
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* -----------------------------------------------------------------------------
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*
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* GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
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* This file is part of GNSS-SDR.
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*
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* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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* -----------------------------------------------------------------------------
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*/
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#include "gnss_sdr_make_unique.h"
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#include <armadillo>
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#include <gnuradio/fft/fft.h>
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#include <chrono>
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#include <memory>
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DEFINE_int32(fft_speed_iterations_test, 100, "Number of averaged iterations in FFT length timing test");
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TEST(FFTSpeedTest, ArmadilloVSGNURadioExecutionTime)
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{
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unsigned int d_fft_size;
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std::chrono::time_point<std::chrono::system_clock> start, end;
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std::chrono::duration<double> elapsed_seconds;
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unsigned int fft_sizes[19] = {16, 25, 32, 45, 64, 95, 128, 195, 256, 325, 512, 785, 1024, 1503, 2048, 3127, 4096, 6349, 8192};
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double d_execution_time;
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EXPECT_NO_THROW(
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for (unsigned int fft_size
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: fft_sizes) {
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d_fft_size = fft_size;
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#if GNURADIO_FFT_USES_TEMPLATES
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auto d_gr_fft = std::make_unique<gr::fft::fft_complex_fwd>(d_fft_size);
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#else
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auto d_gr_fft = std::make_unique<gr::fft::fft_complex>(d_fft_size, true);
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#endif
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arma::arma_rng::set_seed_random();
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arma::cx_fvec d_arma_fft = arma::cx_fvec(d_fft_size).randn() + gr_complex(0.0, 1.0) * arma::cx_fvec(d_fft_size).randn();
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arma::cx_fvec d_arma_fft_result(d_fft_size);
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memcpy(d_gr_fft->get_inbuf(), d_arma_fft.memptr(), sizeof(gr_complex) * d_fft_size);
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start = std::chrono::system_clock::now();
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for (int k = 0; k < FLAGS_fft_speed_iterations_test; k++)
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{
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d_gr_fft->execute();
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}
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end = std::chrono::system_clock::now();
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elapsed_seconds = end - start;
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d_execution_time = elapsed_seconds.count() / static_cast<double>(FLAGS_fft_speed_iterations_test);
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std::cout << "GNU Radio FFT execution time for length = " << d_fft_size << " : " << d_execution_time * 1e6 << " [us]\n";
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start = std::chrono::system_clock::now();
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for (int k = 0; k < FLAGS_fft_speed_iterations_test; k++)
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{
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d_arma_fft_result = arma::fft(d_arma_fft);
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}
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end = std::chrono::system_clock::now();
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elapsed_seconds = end - start;
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d_execution_time = elapsed_seconds.count() / static_cast<double>(FLAGS_fft_speed_iterations_test);
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std::cout << "Armadillo FFT execution time for length = " << d_fft_size << " : " << d_execution_time * 1e6 << " [us]\n";
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});
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}
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