WhisperCom/libs/loguru/glog_bench/glog_bench.cpp

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#include <chrono>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <glog/logging.h>
#include <glog/raw_logging.h>
const size_t kNumIterations = 50 * 1000;
const size_t kNumRuns = 10;
const double kPi = 3.1415926535897932384626433;
static long long now_ns()
{
using namespace std::chrono;
return duration_cast<nanoseconds>(high_resolution_clock::now().time_since_epoch()).count();
}
template<typename Function>
double time_sec(const Function& function)
{
auto start_ns = now_ns();
function();
return (now_ns() - start_ns) * 1e-9;
}
template<typename Function>
void bench(const std::string& name, const Function& function)
{
function(); // Warm-up
printf("%-30s ", name.c_str());
fflush(stdout);
std::vector<double> times;
double sum = 0;
for (size_t i = 0; i < kNumRuns; ++i)
{
times.push_back(time_sec(function) / kNumIterations);
sum += times.back();
}
double mean = sum / kNumRuns;
double std_dev_sum = 0;
for (double time : times) {
std_dev_sum += (time - mean) * (time - mean);
}
double variance = std::sqrt(std_dev_sum / kNumRuns);
printf("%6.3f +- %.3f us per call\n", mean * 1e6, variance * 1e6);
fflush(stdout);
}
// ----------------------------------------------------------------------------
void stream_strings()
{
for (size_t i = 0; i < kNumIterations; ++i) {
LOG(WARNING) << "Some long, complex message.";
}
google::FlushLogFiles(google::GLOG_INFO);
}
void stream_float()
{
for (size_t i = 0; i < kNumIterations; ++i) {
LOG(WARNING) << std::setfill('0') << std::setw(6) << std::setprecision(3) << kPi;
}
google::FlushLogFiles(google::GLOG_INFO);
}
void raw_string_float()
{
for (size_t i = 0; i < kNumIterations; ++i) {
RAW_LOG(WARNING, "Some long, complex message.");
}
google::FlushLogFiles(google::GLOG_INFO);
}
int main(int argc, char* argv[])
{
FLAGS_alsologtostderr = true;
google::ParseCommandLineFlags(&argc, &argv, true);
google::InitGoogleLogging(argv[0]);
bench("LOG(WARNING) << string (buffered):", stream_strings);
bench("LOG(WARNING) << float (buffered):", stream_float);
FLAGS_logbufsecs = 0; // Flush all output in realtime
bench("LOG(WARNING) << string (unbuffered):", stream_strings);
bench("LOG(WARNING) << float (unbuffered):", stream_float);
}