update bench

bench/spdlog-null-async.cpp

@@ -63,17 +63,17 @@ int main(int argc, char *argv[])
         cout << "*******************************************************************************\n";
 
         size_t total_rate = 0;
-
+		spdlog::init_thread_pool(tp_queue_size, tp_threads);		
         for (int i = 0; i < iters; ++i)
-        {
-            spdlog::init_thread_pool(tp_queue_size, tp_threads);
-            // auto as = spdlog::daily_logger_st("as", "logs/daily_async");
-            auto as = spdlog::create_async_logger<null_sink_st>("async(null-sink)");
+        {			
+            auto as = spdlog::create_async_logger<null_sink_mt>("async(null-sink)");
             total_rate += bench_as(howmany, as, client_threads);
             spdlog::drop("async(null-sink)");
+			spdlog::details::registry::instance().get_thread_pool()->wait_empty ();
         }
         std::cout << endl;
         std::cout << "Avg rate: " << format(total_rate / iters) << "/sec" << std::endl;
+		
     }
     catch (std::exception &ex)
     {