mirror of
https://github.com/google/benchmark.git
synced 2024-12-28 05:20:14 +08:00
227 lines
8.4 KiB
C++
227 lines
8.4 KiB
C++
#undef NDEBUG
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#include <algorithm>
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#include <cassert>
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#include <cmath>
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#include <cstdlib>
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#include <vector>
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#include "benchmark/benchmark.h"
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#include "output_test.h"
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namespace {
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#define ADD_COMPLEXITY_CASES(...) \
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int CONCAT(dummy, __LINE__) = AddComplexityTest(__VA_ARGS__)
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int AddComplexityTest(const std::string &test_name,
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const std::string &big_o_test_name,
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const std::string &rms_test_name,
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const std::string &big_o, int family_index) {
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SetSubstitutions({{"%name", test_name},
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{"%bigo_name", big_o_test_name},
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{"%rms_name", rms_test_name},
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{"%bigo_str", "[ ]* %float " + big_o},
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{"%bigo", big_o},
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{"%rms", "[ ]*[0-9]+ %"}});
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AddCases(
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TC_ConsoleOut,
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{{"^%bigo_name %bigo_str %bigo_str[ ]*$"},
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{"^%bigo_name", MR_Not}, // Assert we we didn't only matched a name.
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{"^%rms_name %rms %rms[ ]*$", MR_Next}});
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AddCases(
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TC_JSONOut,
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{{"\"name\": \"%bigo_name\",$"},
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{"\"family_index\": " + std::to_string(family_index) + ",$", MR_Next},
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{"\"per_family_instance_index\": 0,$", MR_Next},
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{"\"run_name\": \"%name\",$", MR_Next},
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{"\"run_type\": \"aggregate\",$", MR_Next},
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{"\"repetitions\": %int,$", MR_Next},
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{"\"threads\": 1,$", MR_Next},
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{"\"aggregate_name\": \"BigO\",$", MR_Next},
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{"\"aggregate_unit\": \"time\",$", MR_Next},
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{"\"cpu_coefficient\": %float,$", MR_Next},
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{"\"real_coefficient\": %float,$", MR_Next},
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{"\"big_o\": \"%bigo\",$", MR_Next},
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{"\"time_unit\": \"ns\"$", MR_Next},
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{"}", MR_Next},
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{"\"name\": \"%rms_name\",$"},
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{"\"family_index\": " + std::to_string(family_index) + ",$", MR_Next},
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{"\"per_family_instance_index\": 0,$", MR_Next},
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{"\"run_name\": \"%name\",$", MR_Next},
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{"\"run_type\": \"aggregate\",$", MR_Next},
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{"\"repetitions\": %int,$", MR_Next},
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{"\"threads\": 1,$", MR_Next},
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{"\"aggregate_name\": \"RMS\",$", MR_Next},
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{"\"aggregate_unit\": \"percentage\",$", MR_Next},
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{"\"rms\": %float$", MR_Next},
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{"}", MR_Next}});
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AddCases(TC_CSVOut, {{"^\"%bigo_name\",,%float,%float,%bigo,,,,,$"},
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{"^\"%bigo_name\"", MR_Not},
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{"^\"%rms_name\",,%float,%float,,,,,,$", MR_Next}});
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return 0;
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}
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} // end namespace
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// ========================================================================= //
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// --------------------------- Testing BigO O(1) --------------------------- //
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// ========================================================================= //
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void BM_Complexity_O1(benchmark::State &state) {
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for (auto _ : state) {
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for (int i = 0; i < 1024; ++i) {
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benchmark::DoNotOptimize(&i);
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}
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}
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state.SetComplexityN(state.range(0));
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}
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BENCHMARK(BM_Complexity_O1)->Range(1, 1 << 18)->Complexity(benchmark::o1);
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BENCHMARK(BM_Complexity_O1)->Range(1, 1 << 18)->Complexity();
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BENCHMARK(BM_Complexity_O1)
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->Range(1, 1 << 18)
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->Complexity([](benchmark::IterationCount) { return 1.0; });
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const char *one_test_name = "BM_Complexity_O1";
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const char *big_o_1_test_name = "BM_Complexity_O1_BigO";
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const char *rms_o_1_test_name = "BM_Complexity_O1_RMS";
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const char *enum_big_o_1 = "\\([0-9]+\\)";
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// FIXME: Tolerate both '(1)' and 'lgN' as output when the complexity is auto
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// deduced.
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// See https://github.com/google/benchmark/issues/272
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const char *auto_big_o_1 = "(\\([0-9]+\\))|(lgN)";
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const char *lambda_big_o_1 = "f\\(N\\)";
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// Add enum tests
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ADD_COMPLEXITY_CASES(one_test_name, big_o_1_test_name, rms_o_1_test_name,
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enum_big_o_1, /*family_index=*/0);
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// Add auto enum tests
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ADD_COMPLEXITY_CASES(one_test_name, big_o_1_test_name, rms_o_1_test_name,
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auto_big_o_1, /*family_index=*/1);
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// Add lambda tests
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ADD_COMPLEXITY_CASES(one_test_name, big_o_1_test_name, rms_o_1_test_name,
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lambda_big_o_1, /*family_index=*/2);
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// ========================================================================= //
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// --------------------------- Testing BigO O(N) --------------------------- //
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// ========================================================================= //
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std::vector<int> ConstructRandomVector(int64_t size) {
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std::vector<int> v;
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v.reserve(static_cast<size_t>(size));
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for (int i = 0; i < size; ++i) {
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v.push_back(static_cast<int>(std::rand() % size));
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}
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return v;
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}
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void BM_Complexity_O_N(benchmark::State &state) {
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auto v = ConstructRandomVector(state.range(0));
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// Test worst case scenario (item not in vector)
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const int64_t item_not_in_vector = state.range(0) * 2;
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for (auto _ : state) {
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benchmark::DoNotOptimize(std::find(v.begin(), v.end(), item_not_in_vector));
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}
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state.SetComplexityN(state.range(0));
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}
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BENCHMARK(BM_Complexity_O_N)
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->RangeMultiplier(2)
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->Range(1 << 10, 1 << 16)
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->Complexity(benchmark::oN);
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BENCHMARK(BM_Complexity_O_N)
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->RangeMultiplier(2)
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->Range(1 << 10, 1 << 16)
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->Complexity([](benchmark::IterationCount n) -> double {
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return static_cast<double>(n);
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});
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BENCHMARK(BM_Complexity_O_N)
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->RangeMultiplier(2)
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->Range(1 << 10, 1 << 16)
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->Complexity();
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const char *n_test_name = "BM_Complexity_O_N";
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const char *big_o_n_test_name = "BM_Complexity_O_N_BigO";
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const char *rms_o_n_test_name = "BM_Complexity_O_N_RMS";
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const char *enum_auto_big_o_n = "N";
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const char *lambda_big_o_n = "f\\(N\\)";
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// Add enum tests
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ADD_COMPLEXITY_CASES(n_test_name, big_o_n_test_name, rms_o_n_test_name,
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enum_auto_big_o_n, /*family_index=*/3);
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// Add lambda tests
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ADD_COMPLEXITY_CASES(n_test_name, big_o_n_test_name, rms_o_n_test_name,
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lambda_big_o_n, /*family_index=*/4);
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// ========================================================================= //
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// ------------------------- Testing BigO O(N*lgN) ------------------------- //
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// ========================================================================= //
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static void BM_Complexity_O_N_log_N(benchmark::State &state) {
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auto v = ConstructRandomVector(state.range(0));
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for (auto _ : state) {
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std::sort(v.begin(), v.end());
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}
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state.SetComplexityN(state.range(0));
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}
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static const double kLog2E = 1.44269504088896340736;
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BENCHMARK(BM_Complexity_O_N_log_N)
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->RangeMultiplier(2)
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->Range(1 << 10, 1 << 16)
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->Complexity(benchmark::oNLogN);
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BENCHMARK(BM_Complexity_O_N_log_N)
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->RangeMultiplier(2)
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->Range(1 << 10, 1 << 16)
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->Complexity([](benchmark::IterationCount n) {
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return kLog2E * n * log(static_cast<double>(n));
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});
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BENCHMARK(BM_Complexity_O_N_log_N)
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->RangeMultiplier(2)
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->Range(1 << 10, 1 << 16)
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->Complexity();
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const char *n_lg_n_test_name = "BM_Complexity_O_N_log_N";
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const char *big_o_n_lg_n_test_name = "BM_Complexity_O_N_log_N_BigO";
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const char *rms_o_n_lg_n_test_name = "BM_Complexity_O_N_log_N_RMS";
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const char *enum_auto_big_o_n_lg_n = "NlgN";
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const char *lambda_big_o_n_lg_n = "f\\(N\\)";
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// Add enum tests
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ADD_COMPLEXITY_CASES(n_lg_n_test_name, big_o_n_lg_n_test_name,
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rms_o_n_lg_n_test_name, enum_auto_big_o_n_lg_n,
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/*family_index=*/6);
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// Add lambda tests
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ADD_COMPLEXITY_CASES(n_lg_n_test_name, big_o_n_lg_n_test_name,
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rms_o_n_lg_n_test_name, lambda_big_o_n_lg_n,
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/*family_index=*/7);
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// ========================================================================= //
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// -------- Testing formatting of Complexity with captured args ------------ //
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// ========================================================================= //
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void BM_ComplexityCaptureArgs(benchmark::State &state, int n) {
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for (auto _ : state) {
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// This test requires a non-zero CPU time to avoid divide-by-zero
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benchmark::DoNotOptimize(state.iterations());
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}
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state.SetComplexityN(n);
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}
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BENCHMARK_CAPTURE(BM_ComplexityCaptureArgs, capture_test, 100)
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->Complexity(benchmark::oN)
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->Ranges({{1, 2}, {3, 4}});
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const std::string complexity_capture_name =
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"BM_ComplexityCaptureArgs/capture_test";
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ADD_COMPLEXITY_CASES(complexity_capture_name, complexity_capture_name + "_BigO",
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complexity_capture_name + "_RMS", "N", /*family_index=*/9);
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// ========================================================================= //
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// --------------------------- TEST CASES END ------------------------------ //
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// ========================================================================= //
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int main(int argc, char *argv[]) { RunOutputTests(argc, argv); }
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