83 lines
2.3 KiB
Markdown
83 lines
2.3 KiB
Markdown
|
# spdlog
|
||
|
|
|
||
|
|
spdlog is very fast, header only, c++11 logging library.
|
||
|
|
|
||
|
|
|
||
|
|
## Install
|
||
|
|
Just copy the files to your build tree and use a C++11 compiler
|
||
|
|
|
||
|
|
|
||
|
|
## Tested on:
|
||
|
|
* gcc 4.8.1 and above
|
||
|
|
* clang 3.5
|
||
|
|
* visual studio 2013
|
||
|
|
|
||
|
|
##Features
|
||
|
|
* Stream like, east to use interface
|
||
|
|
* Logging levels
|
||
|
|
* Rotating log files
|
||
|
|
* Daily log files
|
||
|
|
* Async logging
|
||
|
|
* Thread safety
|
||
|
|
* Very low overhead
|
||
|
|
|
||
|
|
## Performance
|
||
|
|
The library is very fast.
|
||
|
|
Here are some benchmarks (Ubuntu, Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz)
|
||
|
|
```
|
||
|
|
*******************************************************************************
|
||
|
|
Single thread, 250,000 iterations, flush every 1000 lines
|
||
|
|
*******************************************************************************
|
||
|
|
rotating_st... 817,860 lines/sec
|
||
|
|
daily_st... 827,820 lines /sec
|
||
|
|
|
||
|
|
*******************************************************************************
|
||
|
|
4 threads sharing same logger, 250,000 iterations, flush every 1000 lines
|
||
|
|
*******************************************************************************
|
||
|
|
rotating_mt... 1,476,013 lines/sec
|
||
|
|
daily_mt... 1,477,619 lines/sec
|
||
|
|
```
|
||
|
|
|
||
|
|
## Usage Example
|
||
|
|
```
|
||
|
|
#include <iostream>
|
||
|
|
#include "spdlog/spdlog.h"
|
||
|
|
|
||
|
|
int main(int, char* [])
|
||
|
|
{
|
||
|
|
namespace spd = spdlog;
|
||
|
|
|
||
|
|
try
|
||
|
|
{
|
||
|
|
std::string filename = "spdlog_example";
|
||
|
|
auto console = spd::stderr_logger_mt("console");
|
||
|
|
console->info("Welcome to spdlog!") ;
|
||
|
|
console->info() << "Creating file " << filename << "..";
|
||
|
|
|
||
|
|
auto file_logger = spd::rotating_logger_mt("file_logger", filename, 1024 * 1024 * 5, 3);
|
||
|
|
file_logger->info("Log file message number", 1);
|
||
|
|
|
||
|
|
for (int i = 0; i < 100; ++i)
|
||
|
|
{
|
||
|
|
auto square = i*i;
|
||
|
|
file_logger->info() << i << '*' << i << '=' << square << " (" << "0x" << std::hex << square << ")";
|
||
|
|
}
|
||
|
|
|
||
|
|
// Change log level to all loggers to warning and above
|
||
|
|
spd::set_level(spd::level::WARN);
|
||
|
|
console->info("This should not be displayed");
|
||
|
|
console->warn("This should!");
|
||
|
|
spd::set_level(spd::level::INFO);
|
||
|
|
|
||
|
|
// Change format pattern to all loggers
|
||
|
|
spd::set_pattern(" **** %Y-%m-%d %H:%M:%S.%e %l **** %v");
|
||
|
|
spd::get("console")->info("This is another message with different format");
|
||
|
|
}
|
||
|
|
catch (const spd::spdlog_ex& ex)
|
||
|
|
{
|
||
|
|
std::cout << "Log failed: " << ex.what() << std::endl;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
```
|