Added async_bench

bench/Makefile

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

bench/async_bench.cpp

+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+//
+// bench.cpp : spdlog benchmarks
+//
+#include "spdlog/async.h"
+#include "spdlog/sinks/basic_file_sink.h"
+#include "spdlog/sinks/stdout_color_sinks.h"
+#include "spdlog/spdlog.h"
+#include "utils.h"
+#include <atomic>
+#include <iostream>
+#include <memory>
+#include <string>
+#include <thread>
+
+using namespace std;
+using namespace std::chrono;
+using namespace spdlog;
+using namespace spdlog::sinks;
+using namespace utils;
+
+void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count);
+
+int count_lines(const char *filename)
+{
+    int counter = 0;
+    auto *infile = fopen(filename, "r");
+    int ch;
+    while (EOF != (ch = getc(infile)))
+    {
+        if ('\n' == ch)
+            counter++;
+    }
+
+    return counter;
+}
+int main(int argc, char *argv[])
+{
+
+    int howmany = 1000000;
+    int queue_size = howmany + 2;
+    int threads = 10;
+    int iters = 3;
+
+    try
+    {
+        auto console = spdlog::stdout_color_mt("console");
+        if (argc == 1)
+        {
+            console->set_pattern("%v");
+            console->info("Usage: {} <message_count> <threads> <q_size> <iterations>", argv[0]);
+            return 0;
+        }
+
+        if (argc > 1)
+            howmany = atoi(argv[1]);
+        if (argc > 2)
+            threads = atoi(argv[2]);
+        if (argc > 3)
+            queue_size = atoi(argv[3]);
+
+        if (argc > 4)
+            iters = atoi(argv[4]);
+
+
+        console->info("-------------------------------------------------");
+        console->info("Messages: {:14n}", howmany);
+        console->info("Threads : {:14n}", threads);
+        console->info("Queue   : {:14n}", queue_size);
+        console->info("Iters   : {:>14n}", iters);
+        console->info("-------------------------------------------------");
+
+        const char *filename = "logs/basic_async.log";
+
+        for (int i = 0; i < iters; i++)
+        {
+            auto tp = std::make_shared<details::thread_pool>(queue_size, 1);
+            auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>(filename, true);
+            auto logger = std::make_shared<async_logger>("async_logger", std::move(file_sink), std::move(tp), async_overflow_policy::block);
+            bench_mt(howmany, std::move(logger), threads);
+            auto count = count_lines(filename);
+
+            if (count != howmany)
+            {
+                console->error("Test failed. {} has {:n} lines instead of {:n}", filename, count, howmany);
+                exit(1);
+            }
+            else
+            {
+                console->info("Line count OK ({:n})\n", count);
+            }
+        }
+    }
+    catch (std::exception &ex)
+    {
+        std::cerr << "Error: " << ex.what() << std::endl;
+        perror("Last error");
+        return 1;
+    }
+    return 0;
+}
+
+void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count)
+{
+    using std::chrono::high_resolution_clock;
+    vector<thread> threads;
+    auto start = high_resolution_clock::now();
+    for (int t = 0; t < thread_count; ++t)
+    {
+        threads.push_back(std::thread([&]() {
+            for (int j = 0; j < howmany / thread_count; j++)
+            {
+                log->info("Hello logger: msg number {}", j);
+            }
+        }));
+    }
+
+    for (auto &t : threads)
+    {
+        t.join();
+    };
+
+    auto delta = high_resolution_clock::now() - start;
+    auto delta_d = duration_cast<duration<double>>(delta).count();
+    spdlog::get("console")->info("Elapsed: {} secs\t {:n}/sec", delta_d, int(howmany / delta_d));
+}