Very fast, header only, C++ logging library.
Just copy the files to your build tree and use a C++11 compiler
- gcc 4.8.1 and above
- clang 3.5
- visual studio 2013
- mingw with g++ 4.9.x
##Features
- Very fast - performance is the primary goal (see becnhmarks below)
- Headers only
- No dependencies
- Cross platform - Linux / Windows on 32/64 bits
- Multi/Single threaded loggers
- Rotating log files
- Daily log files
- Console logging
- Optional async logging
- Logging levels
- Custom formatting with user defined patterns
Here are some benchmarks comparing spdlog vs boost log(1.56.0) on Ubuntu 64 bits, Intel i7-4770 CPU @ 3.40GHz.
The bench writes 1,000,000 log lines to a rotating log file (using shared synchronous logger object):
library | log lines | threads | elapsed |
---|---|---|---|
boost | 1,000,000 | 1 | 4.207s |
spdlog | 1,000,000 | 1 | 0.975s |
library | log lines | threads | elapsed |
---|---|---|---|
boost | 1,000,000 | 10 | 6.592s |
spdlog | 1,000,000 | 10 | 0.961s |
#include <iostream>
#include "spdlog/spdlog.h"
int main(int, char* [])
{
namespace spd = spdlog;
try
{
std::string filename = "spdlog_example";
auto console = spd::stdout_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;
}