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C++ 日志系统实战第六步：性能测试

java 2025/8/13 7:48:54

全是通俗易懂的讲解，如果你本节之前的知识都掌握清楚，那就速速来看我的项目笔记吧~

本文项目结束！

性能测试

下面对日志系统做一个性能测试，测试一下平均每秒能打印多少条日志消息到文件。
主要的测试方法是：每秒能打印日志数 = 打印日志条数 / 总的打印日志消耗时间
主要测试要素：同步 / 异步 & 单线程 / 多线程

100w + 条指定长度的日志输出所耗时间
每秒可以输出多少条日志
每秒可以输出多少 MB 日志

测试环境：

CPU: AMD Ryzen 7 5800H with Radeon Graphics 3.20 GHz
RAM: 16G DDR4 3200
ROM: 512G-SSD
OS: ubuntu-22.04TLS 虚拟机（2CPU 核心 / 4G 内存）

bench.cc

#include"../logs/mylog.h"#include<chrono>
void bench(const std::string &logger_name,size_t thread_count,size_t msg_count,size_t msg_len)
{//1.获取日志器mylog::Logger::ptr logger=mylog::get_logger(logger_name);if(logger.get()==nullptr){return;}std::cout<<"开始测试:"<<msg_count<<"条日志，总大小为:"<<msg_count*msg_len/1024<<"KB"<<std::endl;//2.组织指定长度的日志消息std::string msg(msg_len-1,'a');//少一个字符，以便于结尾有换行符//3.创建指定数量的线程std::vector<std::thread> threads;size_t msg_per_thread=msg_count/thread_count;std::vector<double> cost_arry(thread_count);for(size_t i=0;i<thread_count;i++){threads.emplace_back([&,i](){//4.线程函数内部开始计时auto start_time=std::chrono::high_resolution_clock::now();//5.开始循环写日志for(size_t j=0;j<msg_per_thread;j++){logger->fatal(msg);}//6.线程函数內部结束计时auto end_time=std::chrono::high_resolution_clock::now();std::chrono::duration<double> cost=end_time-start_time;cost_arry[i]=cost.count();std::cout<<"线程 "<<i<<": "<<"\t 输出日志数量:"<<msg_per_thread<<"\t 总耗时:"<<cost.count()<<"s"<<std::endl;});}for(int i=0;i<thread_count;i++){threads[i].join();}//7.计算总耗时：在多线程中，每个线程都会消耗时间，但是线程是并发执行的，所以总耗时是最高的线程的耗时double max_cost=0;for(int i=0;i<thread_count;i++){if(cost_arry[i]>max_cost){max_cost=cost_arry[i];}}size_t msg_per_sec=msg_count/max_cost;size_t size_pre_sec=(msg_count+msg_len)/(max_cost*1024);std::cout<<"总耗时:"<<max_cost<<"s"<<std::endl;std::cout<<"日志输出速度:"<<msg_per_sec<<"条/秒"<<std::endl;std::cout<<"日志输出速度:"<<size_pre_sec<<"KB/秒"<<std::endl;
}
void sync_bench()
{std::shared_ptr<mylog::Logger_builder> builder(new mylog::Global_logger_builder());builder->buildLoggerName("Sync_logger");builder->buildLimitLevel(mylog::Level::Debug);builder->buildLoggerType(mylog::LoggerType::Loggertype_Sync); // 同步日志器builder->buildFormatBuilder("%m%n");builder->buildSinks<mylog::FileSink>("./logfile/sync.log");builder->build();bench("Sync_logger",1,1000000,100);
}
void async_bench()
{std::shared_ptr<mylog::Logger_builder> builder(new mylog::Global_logger_builder());builder->buildLoggerName("Async_logger");builder->buildLimitLevel(mylog::Level::Debug);builder->buildLoggerType(mylog::LoggerType::Loggertype_Async); // 异步日志器builder->buildFormatBuilder("%m%n");builder->buildSinks<mylog::FileSink>("./logfile/async.log");builder->build();bench("Async_logger",3,1000000,100);
}
int main()
{//sync_bench();async_bench();return 0;
}

单线程：

多线程：

text.cc(用于普通情况)

#include "../logs/mylog.h"void loggerTest(const std::string &logger_name) {INFO("------------example--------------------");mylog::Logger::ptr lp = mylog::LoggerManager::getInstance().getLogger(logger_name);lp->debug("%s", "logger->debug");lp->info("%s", "logger->info");lp->warn("%s", "logger->warn");lp->error("%s", "logger->error");lp->fatal("%s", "logger->fatal");// INFO("---------------------------------------");std::string log_msg = "hello -";size_t fsize = 0;size_t count = 0;while(count < 10000) {std::string msg = log_msg + std::to_string(count++);lp->error("%s", msg.c_str());}
}
void functional_test() {
}
int main(int argc, char *argv[])
{std::shared_ptr<mylog::Logger_builder> builder(new mylog::Global_logger_builder());builder->buildLoggerName("Async_logger");builder->buildLimitLevel(mylog::Level::Debug);builder->buildLoggerType(mylog::LoggerType::Loggertype_Async); // 异步日志器builder->buildFormatBuilder("[%d{%H:%M:%S}][%t][%p][%c][%f:%l] %m%n");builder->buildSinks<mylog::StdoutSink>();builder->buildSinks<mylog::FileSink>("./logfile/test_file.log");builder->buildSinks<mylog::RollSinkbySize>("./logfile/test_roll.log", 1024 * 1024*0.6);builder->build();loggerTest("Async_logger");return 0;
}

text.cc(用于根据时间分配文件的情况)

//对时间分块
#include "../logs/mylog.h"void loggerTest(const std::string &logger_name) {INFO("------------example--------------------");mylog::Logger::ptr lp = mylog::LoggerManager::getInstance().getLogger(logger_name);lp->debug("%s", "logger->debug");lp->info("%s", "logger->info");lp->warn("%s", "logger->warn");lp->error("%s", "logger->error");lp->fatal("%s", "logger->fatal");// INFO("---------------------------------------");std::string log_msg = "hello -";size_t fsize = 0;size_t count = 0;time_t start_time = mylog::util::Date::getTime();while(mylog::util::Date::getTime() - start_time < 5) {std::string msg = log_msg + std::to_string(count++);usleep(1000);lp->error("%s", msg.c_str());}
}
void functional_test() {
}
int main(int argc, char *argv[])
{std::shared_ptr<mylog::Logger_builder> builder(new mylog::Global_logger_builder());builder->buildLoggerName("Async_logger");builder->buildLimitLevel(mylog::Level::Debug);builder->buildLoggerType(mylog::LoggerType::Loggertype_Async); // 异步日志器builder->buildFormatBuilder("[%d{%H:%M:%S}][%t][%p][%c][%f:%l] %m%n");builder->buildSinks<mylog::StdoutSink>();builder->buildSinks<mylog::FileSink>("./logfile/test_file.log");builder->buildSinks<mylog::RollSinkbyTime>("./logfile/test_roll.log", mylog::TimeInterval::SECOND); // 按时间分块builder->build();loggerTest("Async_logger");return 0;
}

感谢你看到这里~日志系统的项目已经全部实现完成了！

未来共同进步，期待你的关注👉【A charmer】