Use google benchmark to test latency

bench/Makefile

 CXX	?= g++
-CXXFLAGS	= -march=native -Wall -Wextra -pedantic -std=c++11 -pthread -I../include -fmax-errors=1
+CXXFLAGS	= -march=native -Wall -Wextra -pedantic -std=c++11 -pthread -I../include -fmax-errors=1 
 CXX_RELEASE_FLAGS = -Ofast -flto -Wl,--no-as-needed
 
 
@@ -16,7 +16,7 @@ async_bench: async_bench.cpp
 	
 	
 latency: latency.cpp
-	$(CXX) latency.cpp -o latency $(CXXFLAGS) $(CXX_RELEASE_FLAGS)
+	$(CXX) latency.cpp -o latency $(CXXFLAGS) $(CXX_RELEASE_FLAGS) -lbenchmark
 				
 
 .PHONY: clean

bench/latency.cpp

@@ -7,6 +7,8 @@
 // latency.cpp : spdlog latency benchmarks
 //
 
+#include "benchmark/benchmark.h"
+
 #include "spdlog/spdlog.h"
 #include "spdlog/async.h"
 #include "spdlog/sinks/basic_file_sink.h"
@@ -14,6 +16,7 @@
 #include "spdlog/sinks/null_sink.h"
 #include "spdlog/sinks/rotating_file_sink.h"
 
+
 #include "utils.h"
 #include <atomic>
 #include <cstdlib>
@@ -31,123 +34,51 @@ using namespace utils;
 void bench(int howmany, std::shared_ptr<spdlog::logger> log);
 void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count);
 
-int main(int, char *[])
+void bench_c_string(benchmark::State& state, std::shared_ptr<spdlog::logger> logger)
 {
-    std::srand(static_cast<unsigned>(std::time(nullptr))); // use current time as seed for random generator
-    int howmany = 1000000;
-    int queue_size = howmany + 2;
-    int threads = 10;
-    size_t file_size = 30 * 1024 * 1024;
-    size_t rotating_files = 5;
-
-    try
-    {
-
-        cout << "******************************************************************"
-                "*************\n";
-        cout << "Single thread\n";
-        cout << "******************************************************************"
-                "*************\n";
-
-        auto basic_st = spdlog::basic_logger_mt("basic_st", "logs/basic_st.log", true);
-        bench(howmany, basic_st);
-
-        auto rotating_st = spdlog::rotating_logger_st("rotating_st", "logs/rotating_st.log", file_size, rotating_files);
-        bench(howmany, rotating_st);
-
-        auto daily_st = spdlog::daily_logger_st("daily_st", "logs/daily_st.log");
-        bench(howmany, daily_st);
-
-        bench(howmany, spdlog::create<null_sink_st>("null_st"));
-
-        cout << "\n****************************************************************"
-                "***************\n";
-        cout << threads << " threads sharing same logger\n";
-        cout << "******************************************************************"
-                "*************\n";
-
-        auto basic_mt = spdlog::basic_logger_mt("basic_mt", "logs/basic_mt.log", true);
-        bench_mt(howmany, basic_mt, threads);
-
-        auto rotating_mt = spdlog::rotating_logger_mt("rotating_mt", "logs/rotating_mt.log", file_size, rotating_files);
-        bench_mt(howmany, rotating_mt, threads);
-
-        auto daily_mt = spdlog::daily_logger_mt("daily_mt", "logs/daily_mt.log");
-        bench_mt(howmany, daily_mt, threads);
-        bench(howmany, spdlog::create<null_sink_st>("null_mt"));
+    const char *msg = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum pharetra metus cursus "
+                      "lacus placerat congue. Nulla egestas, mauris a tincidunt tempus, enim lectus volutpat mi, eu consequat sem "
+                      "libero nec massa. In dapibus ipsum a diam rhoncus gravida. Etiam non dapibus eros. Donec fringilla dui sed "
+                      "augue pretium, nec scelerisque est maximus. Nullam convallis, sem nec blandit maximus, nisi turpis ornare "
+                      "nisl, sit amet volutpat neque massa eu odio. Maecenas malesuada quam ex, posuere congue nibh turpis duis.";
 
-        cout << "\n****************************************************************"
-                "***************\n";
-        cout << "async logging.. " << threads << " threads sharing same logger\n";
-        cout << "******************************************************************"
-                "*************\n";
 
-        for (int i = 0; i < 3; ++i)
-        {
-            spdlog::init_thread_pool(static_cast<size_t>(queue_size), 1);
-            auto as = spdlog::basic_logger_mt<spdlog::async_factory>("async", "logs/basic_async.log", true);
-            bench_mt(howmany, as, threads);
-            spdlog::drop("async");
-        }
-    }
-    catch (std::exception &ex)
+    for (auto _ : state)
     {
-        std::cerr << "Error: " << ex.what() << std::endl;
-        perror("Last error");
-        return EXIT_FAILURE;
+        logger->info(msg);
     }
-    return EXIT_SUCCESS;
 }
 
-void bench(int howmany, std::shared_ptr<spdlog::logger> log)
+void bench_formatted_int(benchmark::State& state, std::shared_ptr<spdlog::logger> logger)
 {
-    using namespace std::chrono;
-    using chrono::high_resolution_clock;
-    using chrono::milliseconds;
-    using chrono::nanoseconds;
-
-    cout << log->name() << "...\t\t" << flush;
-    nanoseconds total_nanos = nanoseconds::zero();
-    for (auto i = 0; i < howmany; ++i)
+
+    int i = 0;
+    for (auto _ : state)
     {
-        auto start = high_resolution_clock::now();
-        log->info("Hello logger: msg number {}", i);
-        auto delta_nanos = chrono::duration_cast<nanoseconds>(high_resolution_clock::now() - start);
-        total_nanos += delta_nanos;
+        logger->info("Hello message {} {} {}", ++i, i , i);
     }
-
-    auto avg = total_nanos.count() / howmany;
-    cout << format(avg) << " ns/call" << endl;
 }
 
-void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count)
+
+
+
+int main(int argc, char *argv[])
 {
-    using namespace std::chrono;
-    using chrono::high_resolution_clock;
-    using chrono::milliseconds;
-    using chrono::nanoseconds;
-
-    cout << log->name() << "...\t\t" << flush;
-    vector<thread> threads;
-    std::atomic<nanoseconds::rep> total_nanos{0};
-    for (int t = 0; t < thread_count; ++t)
-    {
-        threads.push_back(std::thread([&]() {
-            for (int j = 0; j < howmany / thread_count; j++)
-            {
-                auto start = high_resolution_clock::now();
-                log->info("Hello logger: msg number {}", j);
-                auto delta_nanos = chrono::duration_cast<nanoseconds>(high_resolution_clock::now() - start);
-                total_nanos += delta_nanos.count();
-            }
-        }));
-    }
 
-    for (auto &t : threads)
-    {
-        t.join();
-    };
+    using spdlog::sinks::null_sink_st ;
+    using spdlog::sinks::null_sink_mt ;
+
+    auto null_logger = std::make_shared<spdlog::logger>("bench", std::make_shared<null_sink_st>());
+    benchmark::RegisterBenchmark("null_sink_st-500_bytes_cstr", bench_c_string, null_logger);
+    benchmark::RegisterBenchmark("null_sink_st-formatted_int", bench_formatted_int, null_logger);
+
+    // 10 threads
+    int n_threads = 10;
+    null_logger = std::make_shared<spdlog::logger>("bench", std::make_shared<null_sink_st>());
+    benchmark::RegisterBenchmark("null_sink_mt-500_bytes_cstr", bench_c_string, null_logger) -> Threads(n_threads);
+    benchmark::RegisterBenchmark("null_sink_mt-formatted_int", bench_formatted_int, null_logger) ->Threads(n_threads);
+    
+    benchmark::Initialize(&argc, argv);
+    benchmark::RunSpecifiedBenchmarks();
 
-    auto avg = total_nanos / howmany;
-    cout << format(avg) << " ns/call" << endl;
 }