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// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/time/civil_time.h"
#include <cstddef>
#include <numeric>
#include <string>
#include <vector>
#include "absl/hash/hash.h"
#include "benchmark/benchmark.h"
namespace {
// Run on (12 X 3492 MHz CPUs); 2018-11-05T13:44:29.814239103-08:00
// CPU: Intel Haswell with HyperThreading (6 cores) dL1:32KB dL2:256KB dL3:15MB
// Benchmark Time(ns) CPU(ns) Iterations
// ----------------------------------------------------------------
// BM_Difference_Days 14.5 14.5 48531105
// BM_Step_Days 12.6 12.6 54876006
// BM_Format 587 587 1000000
// BM_Parse 692 692 1000000
// BM_RoundTripFormatParse 1309 1309 532075
// BM_CivilYearAbslHash 0.710 0.710 976400000
// BM_CivilMonthAbslHash 1.13 1.13 619500000
// BM_CivilDayAbslHash 1.70 1.70 426000000
// BM_CivilHourAbslHash 2.45 2.45 287600000
// BM_CivilMinuteAbslHash 3.21 3.21 226200000
// BM_CivilSecondAbslHash 4.10 4.10 171800000
void BM_Difference_Days(benchmark::State& state) {
const absl::CivilDay c(2014, 8, 22);
const absl::CivilDay epoch(1970, 1, 1);
while (state.KeepRunning()) {
absl::civil_diff_t n = c - epoch;
benchmark::DoNotOptimize(n);
}
}
BENCHMARK(BM_Difference_Days);
void BM_Step_Days(benchmark::State& state) {
const absl::CivilDay kStart(2014, 8, 22);
absl::CivilDay c = kStart;
while (state.KeepRunning()) {
benchmark::DoNotOptimize(++c);
}
}
BENCHMARK(BM_Step_Days);
void BM_Format(benchmark::State& state) {
const absl::CivilSecond c(2014, 1, 2, 3, 4, 5);
while (state.KeepRunning()) {
std::string s = absl::FormatCivilTime(c);
benchmark::DoNotOptimize(s);
}
}
BENCHMARK(BM_Format);
void BM_Parse(benchmark::State& state) {
const std::string f = "2014-01-02T03:04:05";
absl::CivilSecond c;
while (state.KeepRunning()) {
bool b = absl::ParseCivilTime(f, &c);
benchmark::DoNotOptimize(b);
}
}
BENCHMARK(BM_Parse);
void BM_RoundTripFormatParse(benchmark::State& state) {
const absl::CivilSecond c(2014, 1, 2, 3, 4, 5);
absl::CivilSecond out;
while (state.KeepRunning()) {
bool b = absl::ParseCivilTime(absl::FormatCivilTime(c), &out);
benchmark::DoNotOptimize(b);
}
}
BENCHMARK(BM_RoundTripFormatParse);
template <typename T>
void BM_CivilTimeAbslHash(benchmark::State& state) {
const int kSize = 100000;
std::vector<T> civil_times(kSize);
std::iota(civil_times.begin(), civil_times.end(), T(2018));
absl::Hash<T> absl_hasher;
while (state.KeepRunningBatch(kSize)) {
for (const T civil_time : civil_times) {
size_t hash = absl_hasher(civil_time);
benchmark::DoNotOptimize(hash);
}
}
}
void BM_CivilYearAbslHash(benchmark::State& state) {
BM_CivilTimeAbslHash<absl::CivilYear>(state);
}
void BM_CivilMonthAbslHash(benchmark::State& state) {
BM_CivilTimeAbslHash<absl::CivilMonth>(state);
}
void BM_CivilDayAbslHash(benchmark::State& state) {
BM_CivilTimeAbslHash<absl::CivilDay>(state);
}
void BM_CivilHourAbslHash(benchmark::State& state) {
BM_CivilTimeAbslHash<absl::CivilHour>(state);
}
void BM_CivilMinuteAbslHash(benchmark::State& state) {
BM_CivilTimeAbslHash<absl::CivilMinute>(state);
}
void BM_CivilSecondAbslHash(benchmark::State& state) {
BM_CivilTimeAbslHash<absl::CivilSecond>(state);
}
BENCHMARK(BM_CivilYearAbslHash);
BENCHMARK(BM_CivilMonthAbslHash);
BENCHMARK(BM_CivilDayAbslHash);
BENCHMARK(BM_CivilHourAbslHash);
BENCHMARK(BM_CivilMinuteAbslHash);
BENCHMARK(BM_CivilSecondAbslHash);
} // namespace