# spdlog | Gabi Melman | Knowledge Base | Instagit Fast C++ logging library. GitHub Stars: 29.2k Repository: https://github.com/gabime/spdlog --- ## Articles ### [spdlog Sink Performance: A Complete Guide to Choosing Fast Logging Backends](/gabime/spdlog/what-are-the-performance-implications-of-different-spdlog-sink-implementations) Explore spdlog sink performance differences. Learn how thread-safety, I/O cost, and processing impact logging speed and choose the fastest backend for your application. - Tags: performance - Published: 2026-08-06 ### [How to Integrate spdlog with Qt Applications Using qt_color_logger](/gabime/spdlog/how-to-integrate-spdlog-with-qt-applications-using-qt-color-logger) Integrate spdlog with Qt applications effortlessly using qt_color_logger. Stream color coded logs directly to your QTextEdit widget for enhanced debugging and monitoring. - Tags: how-to-guide - Published: 2026-08-06 ### [How spdlog's Error Handler Mechanism Works and How to Customize It](/gabime/spdlog/how-does-spdlog-s-error-handler-mechanism-work-and-how-to-customize-it) Discover how spdlog's error handler works and learn to customize it with callbacks. Set global or per-logger handlers for robust error management in your C++ applications. - Tags: deep-dive - Published: 2026-08-06 ### [How to Configure spdlog for Windows-Specific Logging: Event Log and Debugger Output](/gabime/spdlog/how-to-configure-spdlog-for-windows-specific-logging-debugger-event-log) Learn to configure spdlog for Windows logging with Event Log and debugger output using win_eventlog_sink_mt and msvc_sink_mt. Integrate spdlog seamlessly into your Windows applications. - Tags: how-to-guide - Published: 2026-08-06 ### [How spdlog's Thread Pool Enables Asynchronous Logging: Architecture Deep Dive](/gabime/spdlog/how-does-spdlog-s-thread-pool-implementation-work-for-async-logging) Explore spdlog's thread pool for asynchronous logging. Learn how it offloads sink I/O to dedicated threads, enabling non-blocking log message queuing for faster application performance. - Tags: deep-dive - Published: 2026-08-06 ### [How to Use spdlog's Stopwatch for Measuring Elapsed Time in Logging](/gabime/spdlog/how-to-use-spdlog-s-stopwatch-for-measuring-elapsed-time-in-logging) Learn how to use spdlog stopwatch to measure elapsed time in your logs. This header-only utility integrates seamlessly with fmt for efficient timing. - Tags: how-to-guide - Published: 2026-08-06 ### [spdlog rotating_file_sink vs daily_file_sink: Key Implementation Differences](/gabime/spdlog/what-are-the-differences-between-rotating-file-sink-and-daily-file-sink-implementations) Explore spdlog rotating_file_sink vs daily_file_sink implementation differences. Understand distinct file naming and cleanup for size-based vs. time-based log rotation. - Tags: deep-dive - Published: 2026-08-06 ### [How to Create User-Defined Type Formatters in spdlog: A Complete Guide to fmt Integration](/gabime/spdlog/how-to-create-user-defined-type-formatters-that-integrate-with-spdlog-s-fmt-support) Learn to create user defined type formatters in spdlog by specializing fmt formatter. This guide explains seamless integration with fmt for custom logging. - Tags: how-to-guide - Published: 2026-08-06 ### [How to Configure spdlog's Periodic Flush Feature and Understand Thread-Safety Implications](/gabime/spdlog/how-to-configure-spdlog-s-periodic-flush-feature-and-what-are-the-thread-safety-implications) Configure spdlog's periodic flush feature using flush_every and understand its thread-safe design. Learn how background threads ensure efficient, secure logging. - Tags: how-to-guide - Published: 2026-08-06 ### [How spdlog Integrates with the fmt Library for Formatting Arguments](/gabime/spdlog/how-does-spdlog-integrate-with-the-fmt-library-for-formatting-arguments) Discover how spdlog integrates with the fmt library for efficient, zero-copy argument formatting. Learn about its internal bundling and use of fmt::vformat_to for streamlined log messages. - Tags: internals - Published: 2026-08-06 ### [spdlog log_msg Internal Structure: How Log Records Flow Through Sinks](/gabime/spdlog/what-is-the-internal-structure-of-spdlog-s-log-msg-and-how-is-it-passed-through-sinks) Explore spdlog's log_msg internal structure and how it efficiently flows through sinks. Learn about zero-copy record delivery for optimal performance. - Tags: internals - Published: 2026-08-06 ### [How to Configure spdlog File Event Handlers for Open/Close Callbacks](/gabime/spdlog/how-to-configure-spdlog-file-event-handlers-for-open-close-callbacks) Learn how to configure spdlog file event handlers with before open and after close callbacks. Enhance your logging by registering custom functions for file operations. - Tags: how-to-guide - Published: 2026-08-06 ### [How to Implement Custom Formatter Flags in spdlog's Pattern Matching System](/gabime/spdlog/how-to-implement-custom-formatter-flags-in-spdlog-s-pattern-matching-system) Learn to implement custom formatter flags in spdlog's pattern matching system. Derive from spdlog::custom_flag_formatter, implement methods, and register your flags for personalized logging patterns. - Tags: how-to-guide - Published: 2026-08-06 ### [Thread-Safety Considerations for Using spdlog in Multi-Threaded Applications](/gabime/spdlog/what-are-the-thread-safety-considerations-when-using-spdlog-with-multiple-threads) Learn essential thread-safety considerations for spdlog in multi-threaded apps. Discover how to use *_mt loggers, manage default loggers, and leverage async logging for better performance. - Tags: best-practices - Published: 2026-08-06 ### [How to Create a Multi‑Sink Logger with Different Levels and Formats in spdlog](/gabime/spdlog/how-to-create-a-multi-sink-logger-where-each-sink-has-different-log-levels-and-formats) Learn to create a multi-sink logger in spdlog with unique levels and formats for each sink. Gain precise control over log message output and customization. - Tags: how-to-guide - Published: 2026-08-06 ### [How spdlog's Pattern Formatter Parses Custom Format Strings Internally](/gabime/spdlog/how-does-spdlog-s-pattern-formatter-parse-custom-format-strings-internally) Discover how spdlog's pattern formatter parses custom format strings in a single pass using compile_pattern and dedicated handlers for efficient logging. - Tags: internals - Published: 2026-08-06 ### [Synchronous vs Asynchronous Logger Performance in spdlog: A Complete Guide](/gabime/spdlog/what-is-the-difference-between-synchronous-and-asynchronous-loggers-in-spdlog-performance-wise) Discover synchronous vs asynchronous logger performance in spdlog. Understand how background threads and queues impact caller latency for faster logging. - Tags: performance - Published: 2026-08-06 ### [How spdlog's Registry Manages Multiple Loggers and Default Logger Behavior](/gabime/spdlog/how-does-spdlog-s-registry-manage-multiple-loggers-and-what-s-the-default-logger-behavior) Discover how spdlog's registry efficiently manages multiple loggers and controls default logger behavior. Learn about its thread-safe global registry and fast-access default logger. - Tags: internals - Published: 2026-08-06 ### [How to Implement a Custom Sink in spdlog: A Complete Guide](/gabime/spdlog/how-to-implement-a-custom-sink-in-spdlog-for-logging-to-custom-targets) Learn to implement a custom sink in spdlog by inheriting from base_sink and overriding sink_it_ and flush_ for custom log targets. Get the complete guide here. - Tags: how-to-guide - Published: 2026-08-06 ### [How spdlog Asynchronous Logging Works: Internal Architecture and Overflow Policies Explained](/gabime/spdlog/how-does-spdlog-s-asynchronous-logging-work-internally-and-what-are-the-overflow-policy-options) Explore spdlog's asynchronous logging. Understand its internal architecture, lock-free queue, and overflow policies block and overrun_oldest for efficient log offloading. - Tags: internals - Published: 2026-08-06 ### [How to Change the Default Logger in spdlog: A Complete Guide](/gabime/spdlog/how-to-change-the-default-logger-in-spdlog) Easily change the default logger in spdlog by calling spdlog::set_default_logger. This complete guide shows you how to replace the global logger for info macros. - Tags: how-to-guide - Published: 2026-07-27 ### [spdlog Sinks: A Complete Guide to Console, File, Network, and Custom Logging Targets](/gabime/spdlog/what-are-the-different-types-of-sinks-available-in-spdlog) Explore spdlog sinks for console, file, network, and custom logging. This guide details how spdlog's output handlers direct your log messages effectively. - Tags: deep-dive - Published: 2026-07-27 ### [How to Add Custom Log Formatters in spdlog: A Complete Guide](/gabime/spdlog/how-to-add-custom-log-formatters-in-spdlog) Learn to add custom log formatters in spdlog by inheriting from spdlog::formatter. This guide shows how to implement format and clone methods and attach them to your logger efficiently. - Tags: how-to-guide - Published: 2026-07-27 ### [How to Create Rotating File Sinks in spdlog: A Complete Guide](/gabime/spdlog/how-to-create-rotating-file-sinks-in-spdlog) Learn how to create rotating file sinks in spdlog with our complete guide. Effectively manage log file sizes automatically for better organization and performance. - Tags: how-to-guide - Published: 2026-07-27 ### [What Is the Performance Impact of spdlog? Benchmarks and Architecture Explained](/gabime/spdlog/what-is-the-performance-impact-of-spdlog) Discover spdlog performance: up to 14M messages/sec synchronous null mode and lock-free async queues eliminate thread contention and minimize C++ overhead. - Tags: performance - Published: 2026-07-27 ### [How to Enable Asynchronous Logging with spdlog: A Complete Implementation Guide](/gabime/spdlog/how-to-enable-asynchronous-logging-with-spdlog) Easily implement asynchronous logging with spdlog. Learn how to initialize a thread pool and create async loggers for faster I/O off the main thread. Boost your application's performance today. - Tags: how-to-guide - Published: 2026-07-27 ### [How to Set a Custom Log Format in spdlog: Pattern and Formatter Guide](/gabime/spdlog/how-to-set-a-custom-log-format-in-spdlog) Learn to set a custom log format in spdlog using set_pattern() for global or logger-specific formatting. Control timestamps, levels, and message layouts with conversion specifiers. - Tags: how-to-guide - Published: 2026-07-27 ### [Using spdlog in Multithreaded Applications: Thread Safety and Performance Guide](/gabime/spdlog/can-spdlog-be-used-in-multithreaded-applications) Discover how spdlog ensures thread safety and high performance in multithreaded applications. Learn to leverage mt loggers and asynchronous options for efficient logging. Optimize your code today. - Tags: how-to-guide - Published: 2026-07-27 ### [How to Use File Sinks with spdlog: A Complete C++ Logging Guide](/gabime/spdlog/how-to-use-file-sinks-with-spdlog) Learn to use file sinks with spdlog in C++ to write log messages to disk. This guide covers instantiation, logger attachment, and registration for efficient disk logging. - Tags: how-to-guide - Published: 2026-07-27 ### [How to Configure Multiple Sinks in spdlog: A Complete Guide](/gabime/spdlog/how-to-configure-multiple-sinks-in-spdlog) Learn to configure multiple sinks in spdlog with this complete guide. Easily set up stdout and file logging simultaneously for comprehensive application insights. - Tags: how-to-guide - Published: 2026-07-27 ### [spdlog Log Levels Explained: A Complete Guide to Severity Configuration](/gabime/spdlog/what-are-the-different-log-levels-in-spdlog) Understand spdlog log levels like trace, debug, info, warn, err, critical, and off. Configure severity precisely for better control over your application logs with this complete guide. - Tags: deep-dive - Published: 2026-07-27 ### [How to Integrate spdlog into a C++ Project: Header-Only and Compiled Setup Guide](/gabime/spdlog/how-to-integrate-spdlog-into-c-plus-plus-project) Integrate spdlog into your C++ project using CMake. Choose compiled or header-only setup and start logging with ease to enhance your application's output. - Tags: how-to-guide - Published: 2026-07-27 ### [How to Use spdlog File Event Handlers for Open/Close Callbacks](/gabime/spdlog/spdlog-file-event-handlers-open-close-callbacks) Leverage spdlog file event handlers to execute custom code before or after log file open/close events. Gain control over your file lifecycle with easy-to-implement callbacks. - Tags: how-to-guide - Published: 2026-07-25 ### [Using spdlog Stopwatch for Timing Measurements: A Complete Guide](/gabime/spdlog/using-spdlog-stopwatch-timing-measurements) Master spdlog stopwatch for precise timing measurements. This guide shows how to leverage fmt integration and std::chrono for accurate log message timing. - Tags: how-to-guide - Published: 2026-07-25 ### [How to Use spdlog Mapped Diagnostic Context (MDC) for Thread-Local Logging](/gabime/spdlog/spdlog-mapped-diagnostic-context-mdc-usage) Learn to use spdlog Mapped Diagnostic Context (MDC) for thread-local logging. Inject contextual data automatically into log messages without code changes. Enhance your debugging. - Tags: how-to-guide - Published: 2026-07-25 ### [Custom Formatting with fmt Library Integration in spdlog: A Complete Guide](/gabime/spdlog/custom-formatting-fmt-library-integration-spdlog) Unlock custom formatting in spdlog using the fmt library. Learn how to tailor log messages and patterns for effective debugging. A complete guide for developers. - Tags: how-to-guide - Published: 2026-07-25 ### [spdlog Header-Only vs Compiled Library: Tradeoffs and Compile Time Analysis](/gabime/spdlog/spdlog-header-only-vs-compiled-tradeoffs-compile-times) spdlog header-only vs compiled library: explore tradeoffs and compile times. Use header-only for prototyping, compiled for large projects to reduce build times and binary bloat. - Tags: deep-dive - Published: 2026-07-25 ### [Memory Usage of the Async Logging Queue in spdlog: Implementation and Optimization](/gabime/spdlog/memory-usage-async-logging-queue-spdlog) Understand spdlog's async logging queue memory usage. Learn how the lock-free MPMC queue stores messages and calculate its footprint. Optimize your logging performance now. - Tags: performance - Published: 2026-07-25 ### [spdlog Async vs Synchronous Logging Performance: Complete Technical Comparison](/gabime/spdlog/spdlog-async-vs-synchronous-logging-performance-comparison) spdlog async vs synchronous logging: Discover which performs better. Understand how asynchronous logging boosts throughput and lowers latency by offloading I/O to background threads. - Tags: performance - Published: 2026-07-25 ### [Configuring Syslog Sink on Linux with spdlog: Implementation Guide](/gabime/spdlog/configuring-syslog-sink-linux-spdlog) Learn how to configure a syslog sink in spdlog on Linux. This guide details setting up your logger to send messages to the system log via the syslog API. Implement spdlog's syslog functionality easily. - Tags: how-to-guide - Published: 2026-07-25 ### [Integrating spdlog with Qt using qt_sinks: Complete Implementation Guide](/gabime/spdlog/integrating-spdlog-qt-using-qt_sinks) Implement spdlog with Qt using qt_sinks for thread-safe UI updates. Learn how to forward logs to Qt widgets from background threads with this complete guide. - Tags: how-to-guide - Published: 2026-07-25 ### [Setting Up Custom Error Handlers in spdlog: Global and Per-Logger Configuration](/gabime/spdlog/setting-up-custom-error-handlers-spdlog) Easily set up custom spdlog error handlers. Learn global and per-logger configuration to intercept and manage spdlog internal errors effectively. Optimize your logging. - Tags: how-to-guide - Published: 2026-07-25 ### [Flush on vs Flush Every in spdlog: When to Flush Logs for Maximum Reliability](/gabime/spdlog/flush-on-vs-flush-every-when-flush-logs-spdlog) Understand spdlog flush_on vs flush_every. Persist critical logs instantly with flush_on or schedule periodic flushes with flush_every for optimal reliability and performance. - Tags: best-practices - Published: 2026-07-25 ### [spdlog _st vs _mt Loggers: Thread Safety Explained](/gabime/spdlog/thread-safety-spdlog-st-vs-mt-loggers-explained) Understand spdlog _st vs _mt loggers for thread safety. Choose _st for maximum throughput or _mt for safe concurrent access. Optimize your logging performance. - Tags: deep-dive - Published: 2026-07-25 ### [How to Use Compile-Time Log Level Filtering with SPDLOG_ACTIVE_LEVEL in spdlog](/gabime/spdlog/compile-time-log-level-filtering-spdlog-active-level) Streamline your C++ logging with spdlog! Learn to use compile-time log level filtering via SPDLOG_ACTIVE_LEVEL. Eliminate low-level logs for zero runtime overhead and faster applications. - Tags: how-to-guide - Published: 2026-07-25 ### [Understanding Async Logging in spdlog: Thread Pools and Overflow Policies](/gabime/spdlog/understanding-async-logging-spdlog-thread-pools-overflow-policies) Master async logging in spdlog with thread pools and overflow policies. Discover how lock-free queues optimize log production and sink consumption for efficient backpressure handling. - Tags: deep-dive - Published: 2026-07-25 ### [Synchronous vs Asynchronous Logging in spdlog: What Is the Difference?](/gabime/spdlog/what-is-the-difference-between-synchronous-and-asynchronous-logging-in-spdlog) Understand synchronous vs asynchronous logging in spdlog. Learn how spdlog handles log messages in the caller's thread or a background pool to optimize performance. - Tags: deep-dive - Published: 2026-07-22 ### [How to Flush Log Buffers in spdlog: 4 Methods Explained](/gabime/spdlog/how-to-flush-log-buffers-in-spdlog) Discover 4 effective methods to flush log buffers in spdlog. Ensure your log data reaches its destination immediately with explicit, automatic, and periodic flushing. - Tags: how-to-guide - Published: 2026-07-22 ### [How to Get the Current Log Level in spdlog: Instance vs Global APIs](/gabime/spdlog/how-to-get-the-current-log-level-of-a-logger-in-spdlog) Learn how to get the current log level in spdlog using instance or global APIs. Retrieve logger level with logger->level() or global level using spdlog::get_level(). - Tags: how-to-guide - Published: 2026-07-22 ### [What Are the Different Log Levels Supported by spdlog? A Complete Guide](/gabime/spdlog/what-are-the-different-log-levels-supported-by-spdlog) Explore the seven log levels in spdlog trace debug info warn err critical off. Gain granular control over your C++ application logging verbosity with this complete guide. - Tags: how-to-guide - Published: 2026-07-22 ### [How to Register and Retrieve Loggers by Name in spdlog](/gabime/spdlog/how-to-register-and-retrieve-loggers-by-name-in-spdlog) Learn to register and retrieve loggers by name in spdlog. Discover how spdlog's global registry simplifies centralized logger management for your C++ applications. - Tags: how-to-guide - Published: 2026-07-22 ### [spdlog Format Flags: Complete Reference for Pattern Formatting](/gabime/spdlog/what-are-the-available-format-flags-for-spdlog) Explore spdlog format flags to customize log output with timestamps, levels, thread IDs, and more. Master pattern formatting for efficient logging. - Tags: api-reference - Published: 2026-07-22 ### [spdlog Thread Pool Message Types: Understanding async_msg_type in gabime/spdlog](/gabime/spdlog/what-are-the-different-message-types-processed-by-the-spdlog-thread-pool) Explore spdlog's `async_msg_type` and discover how log, flush, and terminate messages ensure efficient asynchronous logging, buffer flushing, and graceful thread termination. - Tags: internals - Published: 2026-07-22 ### [How to Initialize spdlog's Thread Pool with Custom Settings](/gabime/spdlog/how-to-initialize-spdlog-thread-pool-with-custom-settings) Learn to initialize spdlog's thread pool with custom settings. Configure queue capacity, worker count, and callbacks for efficient asynchronous logging. Maximize your application's performance. - Tags: how-to-guide - Published: 2026-07-22 ### [How the spdlog Thread Pool Handles Log Messages: Inside Async Logging Architecture](/gabime/spdlog/how-does-the-spdlog-thread-pool-handle-log-messages) Explore spdlog's async logging architecture Understand how its thread pool enqueues and processes log messages efficiently for non-blocking application performance. - Tags: internals - Published: 2026-07-22 ### [How to Create a Thread-Safe Custom Sink in spdlog](/gabime/spdlog/how-to-create-a-thread-safe-custom-sink-in-spdlog) Learn to create a thread-safe custom sink in spdlog by inheriting from base_sink and overriding sink_it_() and flush_(). Simplifies thread safety for custom logging. - Tags: how-to-guide - Published: 2026-07-22 ### [spdlog base_sink vs sink: Understanding the Core Difference in spdlog's Sink Hierarchy](/gabime/spdlog/what-is-the-difference-between-spdlog-base-sink-and-sink-classes) Understand the spdlog base_sink vs sink difference. Discover how base_sink offers helper functions while sink defines the core interface for robust logging. - Tags: deep-dive - Published: 2026-07-22 ### [How to Implement a Custom Sink in spdlog: A Complete Guide](/gabime/spdlog/how-to-implement-a-custom-sink-in-spdlog) Learn to implement a custom sink in spdlog by inheriting from base_sink and overriding sink_it_ and flush_ methods. Get a complete guide to effective logging. - Tags: how-to-guide - Published: 2026-07-22 ### [Producer-Consumer Pattern in spdlog Async Logging: Architecture and Implementation](/gabime/spdlog/what-is-the-producer-consumer-pattern-used-in-spdlog-async-logging) Understand the producer consumer pattern in spdlog async logging. Learn how spdlog decouples app threads from worker threads using a lock-protected circular buffer for efficient logging. - Tags: architecture - Published: 2026-07-22 ### [How Does Asynchronous Logging in spdlog Work? A Deep Dive into the Thread-Pool Architecture](/gabime/spdlog/how-does-asynchronous-logging-work-in-spdlog) Discover how asynchronous logging in spdlog leverages a thread-pool and lock-free queue to decouple log producers from I/O, boosting application performance. - Tags: deep-dive - Published: 2026-07-22 ### [How spdlog Integrates with the fmt Library for Message Formatting](/gabime/spdlog/spdlog-fmt-library-integration-message-formatting) Discover how spdlog integrates with the fmt library for efficient message formatting. Learn how spdlog leverages fmt's vformat_to API for fast and flexible logging. Read our guide now. - Tags: internals - Published: 2026-07-21 ### [How to Implement a Custom Error Handler in spdlog](/gabime/spdlog/implement-custom-error-handler-spdlog-failures) Implement a custom error handler in spdlog by setting a callback function. Learn how to intercept spdlog internal failures with set_error_handler for global or individual logger error management. - Tags: how-to-guide - Published: 2026-07-21 ### [How to Create a Custom Sink for spdlog in C++](/gabime/spdlog/create-custom-spdlog-sink-cpp) Learn to create a custom sink for spdlog in C++ by inheriting from base_sink and implementing sink_it() and flush(). Enhance your logging capabilities with spdlog. - Tags: how-to-guide - Published: 2026-07-21 ### [Configuration Options in tweakme.h for spdlog Customization: Complete Macro Reference](/gabime/spdlog/tweakme-h-configuration-options-spdlog-customization) Explore spdlog customization with tweakme.h. Learn to configure clock sources, disable TLS, switch backends, and define custom log levels using compile-time macros. Get the complete reference now. - Tags: api-reference - Published: 2026-07-20 ### [How spdlog Integrates Message Formatting with the fmt Library](/gabime/spdlog/spdlog-message-formatting-fmt-library-integration) Discover how spdlog seamlessly integrates message formatting with the fmt library by delegating runtime formatting to fmt::vformat_to, ensuring efficient and powerful logging. - Tags: internals - Published: 2026-07-20 ### [How to Integrate spdlog into a CMake Project: Complete Guide](/gabime/spdlog/integrate-spdlog-cmake-project) Integrate spdlog into your CMake project seamlessly. Learn to add the spdlog repository as a subdirectory and link against spdlog::spdlog or spdlog::spdlog_header_only for efficient logging. Get the complete guide now - Tags: how-to-guide - Published: 2026-07-20 ### [Thread-Safety Guarantees of spdlog Loggers: A Complete Technical Guide](/gabime/spdlog/thread-safety-guarantees-spdlog-loggers) Discover spdlog thread-safety guarantees. Learn how synchronous and asynchronous loggers ensure safe concurrent logging with atomic variables, mutexes, or lock-free queues. Get the complete technical guide. - Tags: deep-dive - Published: 2026-07-20 ### [How spdlog Stopwatch Works for Precision Timing in C++ Logging](/gabime/spdlog/how-spdlog-stopwatch-feature-works) Learn how spdlog stopwatch uses std::chrono to precisely time C++ operations. Get seamless timing data integration into your logs with fmt. - Tags: deep-dive - Published: 2026-07-20 ### [How to Set Custom Error Handlers in spdlog: Global and Per-Logger Methods](/gabime/spdlog/how-to-set-custom-error-handlers-spdlog) Learn to set custom error handlers in spdlog using global or per-logger methods. Intercept spdlog internal errors effectively and improve your application's robustness. - Tags: how-to-guide - Published: 2026-07-20 ### [How to Configure spdlog to Route Different Log Levels to Different Sinks](/gabime/spdlog/configure-spdlog-route-log-levels-sinks) Configure spdlog to route log levels to different sinks by attaching sinks to a logger and setting min levels. Learn how to independently filter messages by severity. - Tags: how-to-guide - Published: 2026-07-20 ### [Performance Trade-offs of spdlog's Async Logging Mode: Architecture, Queues, and Tuning](/gabime/spdlog/performance-trade-offs-spdlog-async-logging) Explore spdlog's async logging performance trade-offs. Understand architecture, queues, and tuning for massive throughput gains by eliminating producer blocking. - Tags: performance - Published: 2026-07-20 ### [How spdlog File Rotation Works: A Complete Guide to rotating_file_sink](/gabime/spdlog/how-spdlog-file-rotation-works) Learn how spdlog file rotation operates with rotating_file_sink. Discover size-based rotation, cascading renames, and backup management to keep your logs organized and accessible. - Tags: how-to-guide - Published: 2026-07-20 ### [What is the Mapped Diagnostic Context (MDC) in spdlog?](/gabime/spdlog/what-is-spdlog-mapped-diagnostic-context-mdc) Learn about the Mapped Diagnostic Context MDC in spdlog. Automatically inject thread-local key-value data into your logs with the %MDC{key} pattern for better context. - Tags: deep-dive - Published: 2026-07-20 ### [How to Use spdlog's Pattern Formatter with Custom Flags](/gabime/spdlog/spdlog-pattern-formatter-custom-flags) Learn to use spdlog's pattern formatter with custom flags. Inherit spdlog::custom_flag_formatter, override format and clone, and register your flag for enhanced logging. - Tags: how-to-guide - Published: 2026-07-20 ### [Synchronous vs Asynchronous Loggers in spdlog: Key Differences Explained](/gabime/spdlog/sync-vs-async-loggers-spdlog-difference) Understand the key differences between synchronous and asynchronous loggers in spdlog. Learn how spdlog optimizes logging performance for your applications. - Tags: deep-dive - Published: 2026-07-20 ### [How to Configure spdlog Using Environment Variables at Runtime](/gabime/spdlog/configure-spdlog-environment-variables-runtime) Configure spdlog levels at runtime using environment variables. Call load_env_levels() early in main() to set log levels globally or per-logger without recompiling. - Tags: how-to-guide - Published: 2026-07-20 ### [How spdlog Asynchronous Logging Works Internally: Lock-Free Queues and Thread Pools](/gabime/spdlog/how-does-spdlog-async-logging-work-internally) Explore spdlog's asynchronous logging internals. Discover how lock-free queues and thread pools speed up logging by decoupling formatting from I/O operations for faster producer threads. - Tags: internals - Published: 2026-07-20 ### [How to Integrate spdlog with Grafana Loki: A Complete C++ Guide](/gabime/spdlog/spdlog-integrate-grafana-loki) Easily integrate spdlog with Grafana Loki using the built-in loki_sink. Format logs as JSON and push directly to Loki for streamlined C++ application monitoring. Get started today! - Tags: how-to-guide - Published: 2026-07-19 ### [How to Log to the Visual Studio Debug Output Window Using spdlog](/gabime/spdlog/spdlog-log-visual-studio-debug-output) Learn to log to the Visual Studio debug output window with spdlog using the msvc_sink. Route messages instantly for efficient debugging and enhance your development workflow. - Tags: how-to-guide - Published: 2026-07-19 ### [How to Send Logs to Windows Event Log with spdlog: A Complete Implementation Guide](/gabime/spdlog/spdlog-send-logs-windows-event-log) Learn to send logs to Windows Event Log using spdlog's win_eventlog_sink. This guide shows how to register your source and write logs directly via the native ReportEvent API. - Tags: how-to-guide - Published: 2026-07-19 ### [How to Integrate spdlog with Android's logcat: Complete Implementation Guide](/gabime/spdlog/spdlog-integrate-android-logcat) Easily integrate spdlog with Android logcat using the built-in android_sink. Route messages directly to Android's logging system with our complete implementation guide. - Tags: how-to-guide - Published: 2026-07-19 ### [How to Send Logs to Syslog Using spdlog: A Complete Implementation Guide](/gabime/spdlog/spdlog-send-logs-to-syslog) Learn how to send logs to syslog using spdlog. Implement a syslog sink for your C++ applications with this complete guide. Streamline your log management today. - Tags: how-to-guide - Published: 2026-07-19 ### [How spdlog Handles Colored Output on Different Terminals](/gabime/spdlog/spdlog-colored-output-terminal-handling) Discover how spdlog manages colored terminal output across platforms using ANSI codes and WinAPI. Learn about automatic detection and color modes for vibrant logs. - Tags: internals - Published: 2026-07-19 ### [How daily_file_sink Determines When to Create a New Log File in spdlog](/gabime/spdlog/spdlog-daily-file-sink-new-file-trigger) Learn how daily_file_sink in spdlog creates new log files. Discover its timestamp-based rotation strategy and configurable daily time points for efficient log management. - Tags: internals - Published: 2026-07-19 ### [Types of File Sinks in spdlog: basic, rotating, daily, and hourly Explained](/gabime/spdlog/spdlog-file-sink-types) Explore the four spdlog file sink types: basic, rotating, daily, and hourly. Understand their rotation strategies for efficient file logging and management. - Tags: deep-dive - Published: 2026-07-19 ### [How to Get a Named Logger from the spdlog Registry in C++](/gabime/spdlog/spdlog-get-named-logger) Learn how to get a named logger from the spdlog registry in C++ using spdlog::get or direct registry access for fine-grained control. Optimize your logging setup. - Tags: how-to-guide - Published: 2026-07-19 ### [How to Replace the Default Logger in spdlog: A Complete Guide](/gabime/spdlog/spdlog-replace-default-logger) Learn how to replace spdlog's default logger. This guide shows you to atomically swap the global default logger for seamless updates without logging interruptions. - Tags: how-to-guide - Published: 2026-07-19 ### [How to Use the spdlog Default Logger: Configuration, Access, and Replacement](/gabime/spdlog/spdlog-use-default-logger) Learn to access and replace the spdlog default logger using spdlog::default_logger() and spdlog::set_default_logger(). Update global logging macros instantly for efficient C++ logging. - Tags: how-to-guide - Published: 2026-07-19 ### [How to Create a Logger with Multiple Sinks in spdlog](/gabime/spdlog/spdlog-create-logger-multiple-sinks) Learn how to create a logger with multiple sinks in spdlog. Effortlessly direct log messages to various destinations using vectors or the dist_sink for comprehensive logging control. - Tags: how-to-guide - Published: 2026-07-19 ### [C++ Standards Supported by spdlog: From C++11 to C++20](/gabime/spdlog/spdlog-c-plus-plus-standards-supported) Discover spdlog's C++ standards support, from C++11 minimum requirements to C++20 compatibility via fmt library. Enhance your logging today. - Tags: deep-dive - Published: 2026-07-19 ### [How to Integrate spdlog Using Header-Only Mode](/gabime/spdlog/how-to-integrate-spdlog-header-only-mode) Integrate spdlog using header-only mode by defining the SPDLOG_HEADER_ONLY macro. Learn how this simplifies your build process for the fast C++ logging library. - Tags: how-to-guide - Published: 2026-07-19 ### [How to Use spdlog Callback Sink for Custom Log Notifications](/gabime/spdlog/use-spdlog-callback-sink-custom-log-notifications) Learn to use spdlog callback sink for custom log notifications. Intercept logs with std::function for real-time alerts, UI updates, or external integrations. - Tags: how-to-guide - Published: 2026-07-18 ### [How to Configure spdlog Periodic Flush for Log Durability](/gabime/spdlog/configure-spdlog-periodic-flush-log-durability) Ensure log durability with spdlog periodic flush. Configure automatic message flushing at set intervals to prevent data loss from unexpected application crashes. - Tags: how-to-guide - Published: 2026-07-18 ### [How to Use spdlog with Qt Widgets for GUI Logging](/gabime/spdlog/use-spdlog-qt-widgets-gui-logging) Learn to use spdlog with Qt widgets for GUI logging. Integrate spdlog's qt_sink or qt_color_sink with QTextEdit for thread-safe log updates on the main thread. - Tags: how-to-guide - Published: 2026-07-18 ### [spdlog File Sinks: Differences Between Rotating, Daily, and Hourly](/gabime/spdlog/spdlog-file-sinks-rotating-daily-hourly-differences) Understand spdlog file sinks rotating, daily, and hourly. Learn how rotating_file_sink, daily_file_sink, and hourly_file_sink manage log file lifecycles to enforce disk limits or trigger rotation. - Tags: deep-dive - Published: 2026-07-18 ### [How to Implement Custom Error Handlers in spdlog: A Complete Guide](/gabime/spdlog/implement-custom-error-handlers-spdlog) Learn to implement custom error handlers in spdlog. This guide shows how to set global or per-logger callbacks to manage logging failures effectively. Maximize control over your application's error reporting. - Tags: how-to-guide - Published: 2026-07-18 ### [How to Enable and Manage Backtrace Logging in spdlog: A Complete Guide](/gabime/spdlog/spdlog-enable-manage-backtrace-logging) Learn how spdlog enables backtrace logging with a thread-safe buffer to capture recent messages for error analysis. Master managing your logs effectively. - Tags: how-to-guide - Published: 2026-07-18 ### [How spdlog's Registry Manages Loggers and the Default Logger](/gabime/spdlog/spdlog-registry-default-logger-management) Discover how spdlog's registry manages loggers and the default logger. Learn about thread-safe storage and zero-overhead default logger access for optimal performance. - Tags: internals - Published: 2026-07-18 ### [How spdlog's Thread Pool Handles Queue Overflow and Message Persistence](/gabime/spdlog/spdlog-thread-pool-queue-overflow-message-persistence) Learn how spdlog's thread pool manages queue overflow with configurable policies like blocking, discarding, or overwriting. Discover message persistence guarantees for your logs. - Tags: internals - Published: 2026-07-18 ### [How to Use Custom Pattern Flags in spdlog: A Complete Guide](/gabime/spdlog/use-custom-pattern-flags-spdlog-formatting) Learn to use custom pattern flags in spdlog formatting by inheriting from spdlog::custom_flag_formatter. This guide shows you how to implement format and clone methods and register your new flag. - Tags: how-to-guide - Published: 2026-07-18 ### [How to Use Compile-Time Log Levels with SPDLOG_ACTIVE_LEVEL in spdlog](/gabime/spdlog/use-compile-time-log-levels-spdlog-active_level) Master spdlog compile-time log levels with SPDLOG_ACTIVE_LEVEL. Eliminate logging overhead and boost performance by disabling unwanted logs before compilation. - Tags: how-to-guide - Published: 2026-07-18 ### [spdlog Overflow Policies: block vs overrun_oldest Explained](/gabime/spdlog/spdlog-overflow-policies-block-vs-overrun_oldest) Learn spdlog overflow policies: block pauses threads to ensure all messages are written, while overrun_oldest discards old logs for non-blocking writes. Choose the best for your app. - Tags: deep-dive - Published: 2026-07-18 ### [How to Configure and Tune Async Logging with Thread Pool in spdlog](/gabime/spdlog/configure-async-logging-spdlog-thread-pool) Learn to configure and tune async logging with thread pools in spdlog. Optimize your application's performance by customizing worker threads and queue sizes for efficient log management. - Tags: how-to-guide - Published: 2026-07-18 ### [Lifecycle Considerations When Shutting Down Async spdlog Loggers: A Complete Guide](/gabime/spdlog/what-are-the-lifecycle-considerations-when-shutting-down-async-spdlog-loggers) Safely shut down async spdlog loggers by calling spdlog::shutdown() before exit. Drain queues, stop flushers, and join threads to prevent lost logs and undefined behavior. - Tags: best-practices - Published: 2026-07-17 ### [How to Integrate spdlog with Qt Applications Using the qt_sink](/gabime/spdlog/how-to-integrate-spdlog-with-qt-applications-using-the-qt_sink) Integrate spdlog with Qt using qt_sink to send logs to Qt widgets. Utilize spdlog::qt_logger_mt or spdlog::qt_logger_st for thread-safe UI updates via Qt's meta-object system. - Tags: how-to-guide - Published: 2026-07-17 ### [spdlog Error Handling: How to Implement Custom Error Handlers in C++](/gabime/spdlog/what-is-spdlog-s-error-handling-mechanism-and-how-to-implement-custom-error-handlers) Discover spdlog's error handling and learn to implement custom C++ error handlers. Configure global or logger-specific handlers to manage logging exceptions effectively. - Tags: how-to-guide - Published: 2026-07-17 ### [How spdlog Handles Unicode and Wide Character Support on Windows](/gabime/spdlog/how-does-spdlog-handle-unicode-and-wide-character-support-on-windows) Discover how spdlog handles Unicode and wide character support on Windows. Learn about its compile-time features that convert std::wstring to UTF-8 for seamless logging. - Tags: internals - Published: 2026-07-17 ### [How to Implement Custom Formatter Flags for spdlog Pattern Formatter](/gabime/spdlog/how-to-implement-custom-formatter-flags-for-spdlog-pattern-formatter) Learn to implement custom spdlog formatter flags by inheriting from spdlog::custom_flag_formatter. Register your flag with pattern_formatter::add_flag() for advanced logging patterns. - Tags: how-to-guide - Published: 2026-07-17 ### [How to Configure spdlog to Load Log Levels from Environment Variables at Runtime](/gabime/spdlog/how-to-configure-spdlog-to-load-log-levels-from-environment-variables-at-runtime) Easily configure spdlog runtime log levels using environment variables. Call spdlog cfg load env levels to set global and named logger levels dynamically without recompiling your C++ application. - Tags: how-to-guide - Published: 2026-07-17 ### [How to Implement a Custom Sink in spdlog for Specialized Logging Targets](/gabime/spdlog/how-to-implement-a-custom-sink-in-spdlog-for-specialized-logging-targets) Implement a custom spdlog sink to direct logs to specialized targets. Learn to override sink_it_() and flush_() for unique logging needs. - Tags: how-to-guide - Published: 2026-07-17 ### [How to Create Custom Formatters for spdlog: A Complete Implementation Guide](/gabime/spdlog/how-to-create-custom-formatters-for-spdlog) Learn to create custom spdlog formatters by inheriting from spdlog::formatter. Implement format() and clone() then attach to your logger for tailored log output. Full guide. - Tags: how-to-guide - Published: 2026-07-16 ### [Using spdlog in Embedded Systems: Configuration Guide for Microcontrollers](/gabime/spdlog/can-spdlog-be-used-in-embedded-systems) Learn how to use spdlog in embedded systems. Configure for microcontrollers by disabling exceptions, using level filters, and implementing custom sinks for efficient logging. - Tags: how-to-guide - Published: 2026-07-16 ### [How to Flush Log Messages Immediately in spdlog: 4 Methods Explained](/gabime/spdlog/how-to-flush-log-messages-immediately-in-spdlog) Learn to flush spdlog messages instantly. Discover 4 methods including manual flush logger flush, auto-flush by level, and force flush on sink construction. - Tags: how-to-guide - Published: 2026-07-16 ### [How to Implement Custom Log Sinks in spdlog: A Step-by-Step Guide](/gabime/spdlog/how-to-implement-custom-log-sinks-in-spdlog) Learn how to implement custom log sinks in spdlog. This guide details inheriting from base_sink, overriding sink_it_ and flush_ methods, and attaching your custom sink to a logger. - Tags: how-to-guide - Published: 2026-07-16 ### [How to Disable Logging in spdlog for Release Builds](/gabime/spdlog/how-to-disable-logging-in-spdlog-for-release-builds) Disable spdlog logging for release builds by defining SPDLOG_ACTIVE_LEVEL to SPDLOG_LEVEL_OFF. Compile out logging macros, reducing overhead and binary size. - Tags: how-to-guide - Published: 2026-07-15 ### [SPDLog Pattern Format Specifiers: Complete Guide to Custom Log Formats](/gabime/spdlog/spdlog-pattern-format-specifiers) Master SPDLog pattern format specifiers to create custom logs. Learn about prefixes like %v and %Y for timestamps, levels, and metadata with alignment controls. - Tags: deep-dive - Published: 2026-07-15 ### [How to Add Custom Data to spdlog Messages Using the Mapped Diagnostic Context](/gabime/spdlog/how-to-add-custom-data-to-spdlog-messages) Easily add custom data to spdlog messages using the Mapped Diagnostic Context MDC API. Automatically append thread-local key-value pairs to your logs for enhanced context. Learn how now. - Tags: how-to-guide - Published: 2026-07-15 ### [SPDLog Header-Only vs Compiled Library: When to Use Each Variant](/gabime/spdlog/spdlog-header-only-vs-compiled-library) Understand SPDLog header-only vs compiled library trade-offs. Choose the right variant for your project's compilation speed and binary size needs with identical performance. - Tags: deep-dive - Published: 2026-07-15 ### [SPDLog Macros Explained: Compile-Time Logging Control in C++](/gabime/spdlog/spdlog-macros-explained) Master SPDLog macros for powerful compile-time logging control in C++. Achieve zero-cost filtering and auto source location capture with this essential guide. - Tags: deep-dive - Published: 2026-07-15 ### [How to Use spdlog with Different Output Formats (e.g., JSON)](/gabime/spdlog/how-to-use-spdlog-with-different-output-formats-json) Learn to customize spdlog output formats, including JSON, by implementing the spdlog::formatter interface and using set_formatter(). - Tags: tutorial - Published: 2026-07-15 ### [How to Change spdlog Date/Time Format: Complete Pattern Guide](/gabime/spdlog/how-to-change-spdlog-to-use-different-date-time-format) Learn to change spdlog date/time format using set_pattern or custom formatters. Customize your log timestamps with strftime-style flags for clear, organized logging. - Tags: how-to-guide - Published: 2026-07-15 ### [How to Use spdlog with Visual Studio: Complete Setup Guide](/gabime/spdlog/how-to-use-spdlog-with-visual-studio) Learn to use spdlog with Visual Studio easily. This guide covers setup, compiler settings, and immediate logging with the global API for your C++ projects. - Tags: how-to-guide - Published: 2026-07-15 ### [SPDLog Custom Sink Implementation: A Complete Guide](/gabime/spdlog/spdlog-custom-sink-implementation) Learn how to implement a custom SPDLog sink by inheriting from base_sink. Override sink_it_() and flush_() to create versatile logging solutions. Get the complete guide. - Tags: how-to-guide - Published: 2026-07-15 ### [How to Configure spdlog Sinks: A Complete Guide to Console, File, and Async Logging](/gabime/spdlog/how-to-configure-spdlog-sinks) Learn how to configure spdlog sinks with this comprehensive guide. Master console, file, and async logging by setting up shared pointers for `spdlog` instances. - Tags: how-to-guide - Published: 2026-07-15 ### [SPDLog Asynchronous Logging Performance: Architecture and Optimization Guide](/gabime/spdlog/spdlog-asynchronous-logging-performance) Explore SPDLog asynchronous logging performance. Discover how its lock-free queue and thread pool boost throughput 10-20x over synchronous logging. Optimize your C++ applications today. - Tags: performance - Published: 2026-07-15 ### [How to Use spdlog with CMake: Integration Guide for Header-Only and Compiled Builds](/gabime/spdlog/how-to-use-spdlog-with-cmake) Learn how to use spdlog with CMake for header-only or compiled builds. Effortlessly integrate spdlog into your C++ projects by following this comprehensive guide. - Tags: how-to-guide - Published: 2026-07-15 ### [How to Install spdlog on Windows: Header-Only and Compiled Library Guide](/gabime/spdlog/how-to-install-spdlog-on-windows) Learn to install spdlog on Windows as a header-only library or compiled CMake library. Optimize your project with this fast C++ logging library. - Tags: how-to-guide - Published: 2026-07-15 ### [How to Use periodic_worker for Scheduled Tasks in spdlog](/gabime/spdlog/how-to-use-periodic-worker-spdlog) Learn how to use periodic_worker in spdlog to schedule tasks. This RAII helper runs callbacks on a dedicated thread at fixed intervals, automatically managing thread lifecycles. Optimize your C++ logging. - Tags: how-to-guide - Published: 2026-07-14 ### [How to Create User-Defined Formatters with fmt::formatter in spdlog](/gabime/spdlog/how-to-create-user-defined-formatters-fmt-spdlog) Learn to create user-defined formatters in spdlog by specializing fmt::formatter or inheriting spdlog::formatter for custom log message formatting and log line structure. - Tags: how-to-guide - Published: 2026-07-14 ### [How to Use spdlog async_overflow_policy: Block, Overrun_oldest, and Discard_new Explained](/gabime/spdlog/how-to-use-async-overflow-policy-spdlog) Master spdlog async_overflow_policy block overrun_oldest and discard_new to control asynchronous logger queue behavior. Prevent data loss and optimize performance. - Tags: how-to-guide - Published: 2026-07-14 ### [Thread Safety of spdlog _st vs _mt Loggers: When to Use Each Variant](/gabime/spdlog/spdlog-st-vs-mt-thread-safety) Understand the thread safety of spdlog _st vs _mt loggers. Learn when to use the single-threaded _st logger for performance or the multi-threaded _mt logger for safe concurrent access. - Tags: deep-dive - Published: 2026-07-14 ### [How to Replace the Default Logger in spdlog: A Complete Guide](/gabime/spdlog/how-to-replace-default-logger-spdlog) Learn how to replace the default logger in spdlog using set_default_logger. Customize spdlog globally for your C++ projects with this comprehensive guide. - Tags: how-to-guide - Published: 2026-07-14 ### [How to Load Log Levels from Environment Variables in spdlog](/gabime/spdlog/how-to-load-log-levels-from-env-spdlog) Easily load spdlog log levels from environment variables. Call spdlog::cfg::load_env_levels() to configure logger verbosity dynamically at runtime. - Tags: how-to-guide - Published: 2026-07-14 ### [How to Use `android_sink` for Android Logging with spdlog](/gabime/spdlog/how-to-use-android-sink-spdlog) Integrate spdlog with Android logging using android_sink. Forward native C++ messages to logcat seamlessly with spdlog API and __android_log_write. - Tags: how-to-guide - Published: 2026-07-14 ### [How to Integrate spdlog with Qt Using qt_sinks: A Complete Guide](/gabime/spdlog/how-to-integrate-spdlog-with-qt) Integrate spdlog with Qt using qt_sinks for thread-safe logging to UI widgets. Ensure correct thread updates with QMetaObject invokeMethod for seamless background worker integration. - Tags: how-to-guide - Published: 2026-07-14 ### [How to Use the Windows Event Log Sink (win_eventlog_sink) with spdlog](/gabime/spdlog/how-to-use-win-eventlog-sink-spdlog) Learn to use the Windows Event Log sink with spdlog. Easily send application logs to the Windows Event Viewer by registering your source and configuring the win_eventlog_sink. - Tags: how-to-guide - Published: 2026-07-14 ### [How to Configure the Syslog Sink in spdlog: A Complete Guide](/gabime/spdlog/how-to-configure-syslog-sink-spdlog) Master spdlog syslog sink configuration with this complete guide. Learn to set up thread safety, identifiers, and formatting options for efficient log forwarding. Improve your logging today. - Tags: how-to-guide - Published: 2026-07-14 ### [Difference Between daily_file_sink and rotating_file_sink in spdlog: Complete Guide](/gabime/spdlog/spdlog-daily-vs-rotating-file-sink) Understand the difference between daily_file_sink and rotating_file_sink in spdlog. Learn when to use daily sinks for time-based rotation and rotating sinks for size-based logging. - Tags: deep-dive - Published: 2026-07-14 ### [How to Set a Custom Error Handler in spdlog: Global and Per-Logger APIs](/gabime/spdlog/how-to-set-custom-error-handler-spdlog) Learn how to set a custom error handler in spdlog globally or per logger with C++ APIs. Redirect spdlog errors to monitoring systems instead of stderr. - Tags: how-to-guide - Published: 2026-07-14 ### [How to Configure flush_on and flush_every in spdlog: Complete Control Over Log Buffering](/gabime/spdlog/how-to-configure-flush-options-spdlog) Master spdlog log buffering with flush_on and flush_every. Gain granular control over how and when your logs are written with this comprehensive guide. - Tags: how-to-guide - Published: 2026-07-14 ### [How to Log Binary Data with to_hex in spdlog: Format Flags and Examples](/gabime/spdlog/how-to-log-binary-data-to-hex-spdlog) Log binary data with spdlog to_hex. Convert byte buffers to hex strings using format flags for uppercase or ASCII output. Optimize your logging now. - Tags: how-to-guide - Published: 2026-07-14 ### [How Mapped Diagnostic Context (MDC) Works in spdlog: Thread-Local Logging Guide](/gabime/spdlog/how-does-mdc-work-spdlog) Learn how spdlog's Mapped Diagnostic Context (MDC) injects thread-local key-value pairs into your logs using the %MDC{key} pattern. Enhance your debugging with this powerful feature. - Tags: deep-dive - Published: 2026-07-14 ### [How to Use enable_backtrace and dump_backtrace in spdlog](/gabime/spdlog/how-to-use-spdlog-backtrace) Learn how to use spdlog's enable_backtrace and dump_backtrace functions. Capture and replay recent log messages to diagnose errors effectively. - Tags: how-to-guide - Published: 2026-07-14 ### [How to Use pattern_formatter with Custom Flags in spdlog](/gabime/spdlog/how-to-use-pattern-formatter-custom-flags-spdlog) Learn to use spdlog pattern_formatter with custom flags. Inherit from spdlog::custom_flag_formatter and register your new flags for enhanced logging capabilities. - Tags: how-to-guide - Published: 2026-07-14 ### [How Async Logging Works in spdlog: Thread Pools and Overflow Policies Explained](/gabime/spdlog/how-does-async-logging-work-spdlog) Explore async logging in spdlog. Understand thread pools and overflow policies like block, overrun_oldest, and discard_new for efficient log handling. Learn how spdlog decouples log production from consumption. - Tags: internals - Published: 2026-07-14 ### [How to Implement a Custom Sink in spdlog: A Complete Guide](/gabime/spdlog/how-to-implement-custom-sink-spdlog) Learn to implement a custom sink in spdlog by inheriting from base_sink and overriding sink_it_ and flush_ methods for effective logging. Get the complete guide. - Tags: how-to-guide - Published: 2026-07-14 ### [spdlog MDC Mapped Diagnostic Context Usage: Complete Implementation Guide](/gabime/spdlog/spdlog-mdc-mapped-diagnostic-context-usage) Master spdlog MDC Mapped Diagnostic Context with this guide. Learn to efficiently inject key-value pairs into logs, automating context for cleaner, more informative messages. Implement today. - Tags: how-to-guide - Published: 2026-07-13 ### [Creating a Custom Formatter for spdlog: Architecture and Implementation Guide](/gabime/spdlog/creating-a-custom-formatter-for-spdlog) Learn to create a custom spdlog formatter by inheriting from spdlog::formatter and implementing format() and clone() methods. Enhance your C++ logging experience today. - Tags: deep-dive - Published: 2026-07-13 ### [Integrating spdlog with syslog: A Complete Guide to the Syslog Sink](/gabime/spdlog/integrating-spdlog-with-syslog) Easily integrate spdlog with syslog using the dedicated syslog sink. This guide covers forwarding log records to the native POSIX syslog service for robust logging. - Tags: how-to-guide - Published: 2026-07-13 ### [Creating an spdlog Logger with Multiple Sinks: A Complete Guide](/gabime/spdlog/creating-spdlog-logger-with-multiple-sinks) Learn to create an spdlog logger with multiple sinks. Aggregate destinations like stdout and files, then pass them to the spdlog logger constructor for comprehensive logging. - Tags: how-to-guide - Published: 2026-07-13 ### [spdlog Synchronous vs Asynchronous Logging Performance Comparison: A Complete Guide](/gabime/spdlog/spdlog-synchronous-vs-asynchronous-logging-performance-comparison) Compare spdlog synchronous vs asynchronous logging performance. Discover how asynchronous logging boosts throughput and reduces latency for high-frequency applications. - Tags: performance - Published: 2026-07-13 ### [How to Configure the spdlog Thread Pool for Asynchronous Logging](/gabime/spdlog/how-to-configure-spdlog-thread-pool-for-asynchronous-logging) Configure spdlog thread pool for asynchronous logging. Initialize the global thread pool with custom queue size and worker thread count for efficient log handling. Learn how to optimize your logging setup. - Tags: how-to-guide - Published: 2026-07-13 ### [spdlog Configuration Options in tweakme.h: Complete Compile-Time Customization Guide](/gabime/spdlog/spdlog-configuration-options-tweakme.h) Unlock spdlog configuration options in tweakme.h for compile-time customization. Optimize logging with zero-cost filtering, coarse clocks, and external fmt integration. - Tags: deep-dive - Published: 2026-07-12 ### [How to Use spdlog Qt Sinks for GUI Logging: A Complete Guide](/gabime/spdlog/how-to-use-spdlog-qt-sinks-gui-logging) Integrate spdlog Qt sinks for thread-safe GUI logging. Redirect logs to QTextEdit, QPlainTextEdit, or custom QObject slots with this comprehensive guide. - Tags: how-to-guide - Published: 2026-07-12 ### [When Does async_logger Defer Destruction in spdlog?](/gabime/spdlog/when-async_logger-defers-destruction-spdlog) Understand when spdlog's async_logger defers destruction. Learn how pending messages keep the logger alive until background threads finish processing. - Tags: internals - Published: 2026-07-12 ### [Thread Safety Considerations for Multi-Threaded spdlog Loggers: A Complete Guide](/gabime/spdlog/thread-safety-multi-threaded-spdlog-loggers) Ensure thread safety with spdlog loggers in concurrent apps. Learn how atomic operations and lock-free queues guarantee safe logging, with exceptions to note. - Tags: best-practices - Published: 2026-07-12 ### [How spdlog Stopwatch Works for Timing Log Messages](/gabime/spdlog/how-spdlog-stopwatch-works) Understand how spdlog stopwatch times log messages. Learn about this lightweight utility using std::chrono::steady_clock and custom fmt formatting for efficient timing in your logs. - Tags: internals - Published: 2026-07-12 ### [spdlog vs Synchronous Logging Performance Differences: A Complete Architectural Guide](/gabime/spdlog/spdlog-vs-synchronous-logging-performance) Explore spdlog vs synchronous logging performance. Discover how async spdlog decouples formatting from I/O for reduced latency and higher throughput, outperforming synchronous loggers. - Tags: performance - Published: 2026-07-12 ### [How to Create a Custom Error Handler in spdlog: Global and Per-Logger Configuration](/gabime/spdlog/how-to-create-custom-error-handler-spdlog) Learn to create a custom error handler in spdlog using global or per-logger configuration. Intercept spdlog errors for better failure management and error reporting. - Tags: how-to-guide - Published: 2026-07-12 ### [spdlog Source Location Tracking: A Complete Guide to __FILE__, __LINE__, and Function Names](/gabime/spdlog/spdlog-source-location-tracking) Unlock powerful spdlog source location tracking with __LINE__, __FILE__, and __func__. Learn how to capture and format detailed debug information for your C++ applications. - Tags: deep-dive - Published: 2026-07-12 ### [Creating Custom Pattern Flags with spdlog's PatternFormatter: A Complete Implementation Guide](/gabime/spdlog/custom-pattern-flags-spdlog-pattern_formatter) Learn to create custom pattern flags in spdlog with our complete guide. Extend spdlog's formatting by inheriting from custom_flag_formatter and registering your new flags. - Tags: how-to-guide - Published: 2026-07-12 ### [Configuring Periodic Flush with spdlog flush_every(): A Complete Guide](/gabime/spdlog/configure-periodic-flush-spdlog-flush_every) Learn to configure spdlog flush_every() for automatic log flushing. Ensure logs reach disk with this complete guide to periodic flushes. - Tags: how-to-guide - Published: 2026-07-12 ### [How to Use Mapped Diagnostic Context (MDC) in spdlog: A Complete Guide](/gabime/spdlog/how-to-use-mdc-spdlog) Learn how to use Mapped Diagnostic Context MDC in spdlog. Inject contextual data into logs automatically with this comprehensive guide and simplify your debugging. - Tags: how-to-guide - Published: 2026-07-12 ### [spdlog Backtrace Feature and Ring Buffer Usage: Implementation Guide](/gabime/spdlog/spdlog-backtrace-ring-buffer) Implement spdlog's backtrace feature with a ring buffer. Learn how to store and dump recent logs using spdlog::details::backtracer and circular_q. Enhance your debugging. - Tags: implementation-guide - Published: 2026-07-12 ### [How to Configure spdlog Async Thread Pool Size and Queue](/gabime/spdlog/configure-spdlog-async-thread-pool) Learn how to configure spdlog async thread pool size and queue with init_thread_pool before creating async loggers. Optimize your logging performance easily. - Tags: how-to-guide - Published: 2026-07-12 ### [spdlog Async Overflow Policies: Block vs Overrun Oldest Explained](/gabime/spdlog/spdlog-async-overflow-policies-block-vs-overrun_oldest) Understand spdlog async overflow policies block vs overrun_oldest. Learn how to handle full logging queues to prevent blocking or losing critical messages. - Tags: deep-dive - Published: 2026-07-12