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45b194e4d4
* Introduce Coefficient of variation aggregate I believe, it is much more useful / use to understand, because it is already normalized by the mean, so it is not affected by the duration of the benchmark, unlike the standard deviation. Example of real-world output: ``` raw.pixls.us-unique/GoPro/HERO6 Black$ ~/rawspeed/build-old/src/utilities/rsbench/rsbench GOPR9172.GPR --benchmark_repetitions=27 --benchmark_display_aggregates_only=true --benchmark_counters_tabular=true 2021-09-03T18:05:56+03:00 Running /home/lebedevri/rawspeed/build-old/src/utilities/rsbench/rsbench Run on (32 X 3596.16 MHz CPU s) CPU Caches: L1 Data 32 KiB (x16) L1 Instruction 32 KiB (x16) L2 Unified 512 KiB (x16) L3 Unified 32768 KiB (x2) Load Average: 7.00, 2.99, 1.85 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations CPUTime,s CPUTime/WallTime Pixels Pixels/CPUTime Pixels/WallTime Raws/CPUTime Raws/WallTime WallTime,s ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ GOPR9172.GPR/threads:32/process_time/real_time_mean 11.1 ms 353 ms 27 0.353122 31.9473 12M 33.9879M 1085.84M 2.83232 90.4864 0.0110535 GOPR9172.GPR/threads:32/process_time/real_time_median 11.0 ms 352 ms 27 0.351696 31.9599 12M 34.1203M 1090.11M 2.84336 90.8425 0.0110081 GOPR9172.GPR/threads:32/process_time/real_time_stddev 0.159 ms 4.60 ms 27 4.59539m 0.0462064 0 426.371k 14.9631M 0.0355309 1.24692 158.944u GOPR9172.GPR/threads:32/process_time/real_time_cv 1.44 % 1.30 % 27 0.0130136 1.44633m 0 0.0125448 0.0137802 0.0125448 0.0137802 0.0143795 ``` Fixes https://github.com/google/benchmark/issues/1146 * Be consistent, it's CV, not 'rel std dev'
36 lines
1.3 KiB
C++
36 lines
1.3 KiB
C++
//===---------------------------------------------------------------------===//
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// statistics_test - Unit tests for src/statistics.cc
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//===---------------------------------------------------------------------===//
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#include "../src/statistics.h"
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#include "gtest/gtest.h"
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namespace {
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TEST(StatisticsTest, Mean) {
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EXPECT_DOUBLE_EQ(benchmark::StatisticsMean({42, 42, 42, 42}), 42.0);
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EXPECT_DOUBLE_EQ(benchmark::StatisticsMean({1, 2, 3, 4}), 2.5);
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EXPECT_DOUBLE_EQ(benchmark::StatisticsMean({1, 2, 5, 10, 10, 14}), 7.0);
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}
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TEST(StatisticsTest, Median) {
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EXPECT_DOUBLE_EQ(benchmark::StatisticsMedian({42, 42, 42, 42}), 42.0);
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EXPECT_DOUBLE_EQ(benchmark::StatisticsMedian({1, 2, 3, 4}), 2.5);
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EXPECT_DOUBLE_EQ(benchmark::StatisticsMedian({1, 2, 5, 10, 10}), 5.0);
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}
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TEST(StatisticsTest, StdDev) {
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EXPECT_DOUBLE_EQ(benchmark::StatisticsStdDev({101, 101, 101, 101}), 0.0);
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EXPECT_DOUBLE_EQ(benchmark::StatisticsStdDev({1, 2, 3}), 1.0);
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EXPECT_DOUBLE_EQ(benchmark::StatisticsStdDev({2.5, 2.4, 3.3, 4.2, 5.1}),
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1.151086443322134);
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}
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TEST(StatisticsTest, CV) {
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EXPECT_DOUBLE_EQ(benchmark::StatisticsCV({101, 101, 101, 101}), 0.0);
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EXPECT_DOUBLE_EQ(benchmark::StatisticsCV({1, 2, 3}), 1. / 2.);
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EXPECT_DOUBLE_EQ(benchmark::StatisticsCV({2.5, 2.4, 3.3, 4.2, 5.1}),
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0.32888184094918121);
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}
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} // end namespace
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