On my machine I'm getting following results (real time, best of 3):
        1 thread   10 threads   100 threads
zf_log   0.466s     2.711s       2.608s
spdlog   0.747s     5.121s       5.376s
		
	
		
			
				
	
	
		
			57 lines
		
	
	
		
			1.2 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			57 lines
		
	
	
		
			1.2 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
#include <thread>
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#include <vector>
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#include <atomic>
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#include <cstdlib>
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#include <unistd.h>
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#include <fcntl.h>
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#include <zf_log.c>
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const char g_path[] = "logs/zf_log.txt";
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int g_fd;
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static void output_callback(zf_log_message *msg)
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{
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	*msg->p = '\n';
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	write(g_fd, msg->buf, msg->p - msg->buf + 1);
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}
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using namespace std;
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int main(int argc, char* argv[])
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{
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	g_fd = open(g_path, O_APPEND|O_CREAT|O_WRONLY);
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	if (0 > g_fd)
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	{
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		ZF_LOGE_AUX(ZF_LOG_STDERR, "Failed to open log file: %s", g_path);
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		return -1;
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	}
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	zf_log_set_output_callback(ZF_LOG_PUT_STD, output_callback);
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    int thread_count = 10;
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    if(argc > 1)
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        thread_count = std::atoi(argv[1]);
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    int howmany = 1000000;
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    std::atomic<int > msg_counter {0};
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    vector<thread> threads;
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    for (int t = 0; t < thread_count; ++t)
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    {
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        threads.push_back(std::thread([&]()
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        {
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            while (true)
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            {
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                int counter = ++msg_counter;
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                if (counter > howmany) break;
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				ZF_LOGI("zf_log message #%i: This is some text for your pleasure", counter);
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            }
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        }));
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    }
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    for (auto &t:threads)
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    {
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        t.join();
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    };
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	close(g_fd);
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    return 0;
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}
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