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103 lines
2.8 KiB
Markdown
103 lines
2.8 KiB
Markdown
# spdlog
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Very fast, header only, C++ logging library.
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## Install
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Just copy the files to your build tree and use a C++11 compiler
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## Tested on:
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* gcc 4.8.1 and above
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* clang 3.5
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* visual studio 2013
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* mingw with g++ 4.9.x
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##Features
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* Very fast - performance is the primary goal (see becnhmarks below).
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* Headers only.
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* No dependencies.
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* Cross platform - Linux / Windows on 32/64 bits.
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* Variadic-template/stream call styles: ```logger.info("variadic", x, y) << "or stream" << x << y;```
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* [Custom](https://github.com/gabime/spdlog/wiki/Custom-formatting) formatting.
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* Multi/Single threaded loggers.
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* Various log targets:
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* Rotating log files.
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* Daily log files.
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* Console logging.
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* Linux syslog.
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* Easily extendable with custom log targets (just implement a single function in the [sink](include/spdlog/sinks/sink.h) interface).
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* Optional async logging .
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* Log levels.
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## Benchmarks
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Here are some [benchmarks](bench) comparing spdlog vs other libs on Ubuntu 64 bits, Intel i7-4770 CPU @ 3.40GHz.
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The bench writes 1,000,000 log lines to a rotating log file (using shared synchronous logger object):
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#### Single thread bench
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|library|log lines|threads|elapsed|
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|-------|:-------:|:-----:|------:|
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|*boost log v1.56*|1,000,000|1|**4.207s**|
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|*glog v0.3.3*|1,000,000|1|**1.077s**|
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|*spdlog*|1,000,000|1|**0.975s**|
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#### 10 threads bench
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|library|log lines|threads|elapsed|
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|-------|:-------:|:-----:|------:|
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|*boost log v1.56*|1,000,000|10|**6.592s**|
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|*glog v0.3.3*|1,000,000|10|**1.678s**|
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|*spdlog*|1,000,000|10|**0.961s**|
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## Usage Example
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```c++
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#include <iostream>
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#include "spdlog/spdlog.h"
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int main(int, char* [])
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{
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namespace spd = spdlog;
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try
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{
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std::string filename = "spdlog_example";
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auto console = spd::stdout_logger_mt("console");
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console->info("Welcome to spdlog!") ;
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console->info() << "Creating file " << filename << "..";
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auto file_logger = spd::rotating_logger_mt("file_logger", filename, 1024 * 1024 * 5, 3);
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file_logger->info("Log file message number", 1);
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for (int i = 0; i < 100; ++i)
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{
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auto square = i*i;
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file_logger->info() << i << '*' << i << '=' << square << " (" << "0x" << std::hex << square << ")";
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}
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// Change log level to all loggers to warning and above
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spd::set_level(spd::level::WARN);
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console->info("This should not be displayed");
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console->warn("This should!");
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spd::set_level(spd::level::INFO);
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// Change format pattern to all loggers
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spd::set_pattern(" **** %Y-%m-%d %H:%M:%S.%e %l **** %v");
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spd::get("console")->info("This is another message with different format");
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}
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catch (const spd::spdlog_ex& ex)
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{
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std::cout << "Log failed: " << ex.what() << std::endl;
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}
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return 0;
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}
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```
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