153 lines
6.3 KiB
Markdown
153 lines
6.3 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](#benchmarks) below).
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* Headers only.
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* No dependencies - just copy and use.
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* Cross platform - Linux / Windows on 32/64 bits.
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* **new!** Feature rich [call style](#usage-example) using the excellent [cppformat](http://cppformat.github.io/) library.
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* ostream call style is supported too.
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* Extremely fast asynchronous mode (optional) - use of lockfree queues and other tricks to reach millions of calls per second from multiple threads.
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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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* Severity based filtering - threshold levels can be modified in runtime.
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## Benchmarks
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Below are some [benchmarks](bench) comparing popular log libraries under Ubuntu 64 bit, Intel i7-4770 CPU @ 3.40GHz
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#### Synchronous mode
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Time needed to log 1,000,000 lines under synchronous mode (in seconds, the best of 3 runs):
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|threads|boost log|glog |easylogging |spdlog|
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|-------|:-------:|:-----:|----------:|------:|
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|1| 4.169s |1.066s |0.975s |0.302s|
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|10| 16.029 |3.032s |2.857s |0.968s|
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|100| 15.008 |1.139s |4.512s |0.497s|
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#### Asynchronous mode
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Time needed to log 1,000,000 lines under asynchronous mode, i.e. the time it takes to put them in the async queue (in seconds, the best of 3 runs):
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|threads|g2log |spdlog<sup>async mode</sup>|
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|:-------|:-----:|-------------------------:|
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|1| 1.850s |0.216s |
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|10| 0.943s |0.173s|
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|100| 0.959s |0.202s|
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## Usage Example
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```c++
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/*************************************************************************/
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/* spdlog - an extremely fast and easy to use c++11 logging library. */
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/* Copyright (c) 2014 Gabi Melman. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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//
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// spdlog usage example
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//
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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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// Set log level to all loggers to DEBUG and above
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spd::set_level(spd::level::debug);
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//Create console, multithreaded logger
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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("An info message example {}..", 1);
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console->info() << "Streams are supported too " << 1;
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console->info("Easy padding in numbers like {:08d}", 12);
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console->info("Support for int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}", 42);
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console->info("Support for floats {:03.2f}", 1.23456);
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console->info("Positional args are {1} {0}..", "too", "supported");
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console->info("{:<30}", "left aligned");
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console->info("{:>30}", "right aligned");
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console->info("{:^30}", "centered");
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//Create a file rotating logger with 5mb size max and 3 rotated files
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auto file_logger = spd::rotating_logger_mt("file_logger", "logs/mylogfile", 1048576 * 5, 3);
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file_logger->set_level(spd::level::info);
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for(int i = 0; i < 10; ++i)
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file_logger->info("{} * {} equals {:>10}", i, i, i*i);
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//Customize msg format for all messages
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spd::set_pattern("*** [%H:%M:%S %z] [thread %t] %v ***");
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file_logger->info("This is another message with custom format");
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spd::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name) function");
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SPDLOG_TRACE(console, "Enabled only #ifdef SPDLOG_TRACE_ON..{} ,{}", 1, 3.23);
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SPDLOG_DEBUG(console, "Enabled only #ifdef SPDLOG_DEBUG_ON.. {} ,{}", 1, 3.23);
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//
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// Asynchronous logging is very fast..
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// Just call spdlog::set_async_mode(q_size) and all created loggers from now on will be asynchronous..
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//
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size_t q_size = 1048576; //queue size must be power of 2
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spdlog::set_async_mode(q_size);
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auto async_file= spd::daily_logger_st("async_file_logger", "logs/async_log.txt");
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async_file->info() << "This is async log.." << "Should be very fast!";
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#ifdef __linux__
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// syslog example
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std::string ident = "spdlog-example";
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auto syslog_logger = spd::syslog_logger("syslog", ident, LOG_PID);
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syslog_logger->warn("This is warning that will end up in syslog. This is Linux only!");
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#endif
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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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}
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```
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