149 lines
5.1 KiB
C
149 lines
5.1 KiB
C
// Part of dump1090, a Mode S message decoder for RTLSDR devices.
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//
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// convert_benchmark.c: benchmarks for IQ sample converters
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//
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// Copyright (c) 2016-2017 Oliver Jowett <oliver@mutability.co.uk>
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// Copyright (c) 2017 FlightAware LLC
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//
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// This file is free software: you may copy, redistribute and/or modify it
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// under the terms of the GNU General Public License as published by the
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// Free Software Foundation, either version 2 of the License, or (at your
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// option) any later version.
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//
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// This file is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "dump1090.h"
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static void **testdata_uc8;
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static void **testdata_sc16;
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static void **testdata_sc16q11;
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static uint16_t *outdata;
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// SC16Q11_TABLE_BITS notes:
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// 11 bits (8MB) gives you full precision, but a large table that doesn't fit in cache
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// 9 bits (512kB) will fit in the Pi 2/3's shared L2 cache
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// (but there will be contention from other cores)
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// 8 bits (128kB) will fit in the Pi 1's L2 cache
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// 7 bits (32kB) will fit in the Pi 1/2/3's L1 cache
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// Sample results for "SC16Q11, no DC":
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// Core i7-3610QM @ 2300MHz
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// SC16Q11_TABLE_BITS undefined: 152.80M samples/second
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// SC16Q11_TABLE_BITS=11: 101.22M samples/second
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// SC16Q11_TABLE_BITS=9: 243.04M samples/second
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// SC16Q11_TABLE_BITS=8: 316.84M samples/second
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// SC16Q11_TABLE_BITS=7: 375.70M samples/second
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// Pi3B @ 1200MHz
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// SC16Q11_TABLE_BITS undefined: 22.19M samples/second
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// SC16Q11_TABLE_BITS=11: 5.86M samples/second
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// SC16Q11_TABLE_BITS=9: 19.33M samples/second
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// SC16Q11_TABLE_BITS=8: 33.50M samples/second
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// SC16Q11_TABLE_BITS=7: 59.78M samples/second
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// Pi1B @ 700MHz
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// SC16Q11_TABLE_BITS undefined: 5.24M samples/second
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// SC16Q11_TABLE_BITS=11: 2.53M samples/second
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// SC16Q11_TABLE_BITS=9: 3.23M samples/second
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// SC16Q11_TABLE_BITS=8: 5.77M samples/second
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// SC16Q11_TABLE_BITS=7: 10.23M samples/second
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void prepare()
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{
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srand(1);
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testdata_uc8 = calloc(10, sizeof(void*));
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testdata_sc16 = calloc(10, sizeof(void*));
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testdata_sc16q11 = calloc(10, sizeof(void*));
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outdata = calloc(MODES_MAG_BUF_SAMPLES, sizeof(uint16_t));
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for (int buf = 0; buf < 10; ++buf) {
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uint8_t *uc8 = calloc(MODES_MAG_BUF_SAMPLES, 2);
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testdata_uc8[buf] = uc8;;
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uint16_t *sc16 = calloc(MODES_MAG_BUF_SAMPLES, 4);
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testdata_sc16[buf] = sc16;
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uint16_t *sc16q11 = calloc(MODES_MAG_BUF_SAMPLES, 4);
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testdata_sc16q11[buf] = sc16q11;
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for (unsigned i = 0; i < MODES_MAG_BUF_SAMPLES; ++i) {
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double I = 2.0 * rand() / (RAND_MAX + 1.0) - 1.0;
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double Q = 2.0 * rand() / (RAND_MAX + 1.0) - 1.0;
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uc8[i*2] = (uint8_t) (I * 128 + 128);
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uc8[i*2+1] = (uint8_t) (Q * 128 + 128);
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sc16[i*2] = htole16( (int16_t) (I * 32768.0) );
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sc16[i*2+1] = htole16( (int16_t) (Q * 32768.0) );
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sc16q11[i*2] = htole16( (int16_t) (I * 2048.0) );
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sc16q11[i*2+1] = htole16( (int16_t) (Q * 2048.0) );
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}
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}
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}
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void test(const char *what, input_format_t format, void **data, double sample_rate, bool filter_dc) {
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fprintf(stderr, "Benchmarking: %s ", what);
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struct converter_state *state;
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iq_convert_fn converter = init_converter(format, sample_rate, filter_dc, &state);
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if (!converter) {
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fprintf(stderr, "Can't initialize converter\n");
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return;
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}
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struct timespec total = { 0, 0 };
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int iterations = 0;
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// Run it once to force init.
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converter(data[0], outdata, MODES_MAG_BUF_SAMPLES, state, NULL, NULL);
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while (total.tv_sec < 5) {
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fprintf(stderr, ".");
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struct timespec start;
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start_cpu_timing(&start);
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for (int i = 0; i < 10; ++i) {
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converter(data[i], outdata, MODES_MAG_BUF_SAMPLES, state, NULL, NULL);
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}
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end_cpu_timing(&start, &total);
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iterations++;
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}
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fprintf(stderr, "\n");
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cleanup_converter(state);
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double samples = 10.0 * iterations * MODES_MAG_BUF_SAMPLES;
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double nanos = total.tv_sec * 1e9 + total.tv_nsec;
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fprintf(stderr, " %.2fM samples in %.6f seconds\n",
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samples / 1e6, nanos / 1e9);
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fprintf(stderr, " %.2fM samples/second\n",
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samples / nanos * 1e3);
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}
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int main(int argc, char **argv)
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{
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MODES_NOTUSED(argc);
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MODES_NOTUSED(argv);
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prepare();
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test("SC16Q11, DC", INPUT_SC16Q11, testdata_sc16q11, 2400000, true);
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test("SC16Q11, no DC", INPUT_SC16Q11, testdata_sc16q11, 2400000, false);
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test("UC8, DC", INPUT_UC8, testdata_uc8, 2400000, true);
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test("UC8, no DC", INPUT_UC8, testdata_uc8, 2400000, false);
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test("SC16, DC", INPUT_SC16, testdata_sc16, 2400000, true);
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test("SC16, no DC", INPUT_SC16, testdata_sc16, 2400000, false);
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}
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