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#include <library/cpp/testing/gbenchmark/benchmark.h>
#include <util/datetime/base.h>
#include <util/stream/str.h>
class TTimestampGenerator {
public:
TInstant operator()() {
TInstant result = TInstant::MicroSeconds(Base_ + Current_);
Current_ = (Current_ + Step_) % Range_;
return result;
}
private:
static constexpr ui64 Step_ = TDuration::MicroSeconds(1234567891011).MicroSeconds();
static constexpr ui64 Range_ = 1ull << 45; // ~ year
static constexpr ui64 Base_ = TInstant::Seconds(1605320321).MicroSeconds();
ui64 Current_ = 0;
};
Y_FORCE_INLINE static void BenchFormatStream(auto&& formatFn, benchmark::State& state) {
TTimestampGenerator gen;
TStringStream ss;
for (auto _ : state) {
ss << formatFn(gen());
Y_DO_NOT_OPTIMIZE_AWAY(ss.Str());
ss.clear();
}
}
Y_FORCE_INLINE static void BenchToString(auto&& toStringFn, benchmark::State& state) {
TTimestampGenerator gen;
TString s;
for (auto _ : state) {
s = toStringFn(gen());
Y_DO_NOT_OPTIMIZE_AWAY(s);
}
}
void BM_FormatIsoLocal(benchmark::State& state) {
BenchFormatStream(FormatIsoLocal, state);
}
void BM_FormatLocal(benchmark::State& state) {
BenchFormatStream(FormatLocal, state);
}
void BM_ToStringIsoLocal(benchmark::State& state) {
BenchToString(std::mem_fn(&TInstant::ToIsoStringLocal), state);
}
void BM_ToStringLocal(benchmark::State& state) {
BenchToString(std::mem_fn(&TInstant::ToIsoStringLocal), state);
}
BENCHMARK(BM_FormatIsoLocal);
BENCHMARK(BM_FormatLocal);
BENCHMARK(BM_ToStringIsoLocal);
BENCHMARK(BM_ToStringLocal);
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