Question 1

How to set up asynchronous logging in spdlog?

Accepted Answer

Initialize a thread pool with spdlog::init_thread_pool, then create async loggers using spdlog::basic_logger_mt<spdlog::async_factory> or similar methods. The README provides examples with configurable queue sizes and overflow policies like block or overrun.

Question 2

Is spdlog faster than glog?

Accepted Answer

spdlog is optimized for speed with benchmarks showing higher throughput, often millions of logs per second. However, glog might offer better integration with Google ecosystems, so choose based on performance needs versus existing tooling.

Question 3

Can spdlog log to rotating files?

Accepted Answer

Yes, use spdlog::rotating_logger_mt with parameters for max file size and count, as shown in the rotating_example where logs rotate after reaching 5 MB with up to 3 backup files.

Question 4

How to change log levels at runtime in spdlog?

Accepted Answer

Use spdlog::set_level for global changes or per-logger methods, and load levels from environment variables with spdlog::cfg::load_env_levels, allowing dynamic adjustments without recompilation.

Question 5

Does spdlog support custom log formats?

Accepted Answer

Yes, set custom patterns via spdlog::set_pattern and add user-defined flags with spdlog::custom_flag_formatter, as demonstrated in the custom_flags_example for tailored output.

Question 6

How to handle errors in spdlog?

Accepted Answer

Implement custom error handlers with spdlog::set_error_handler to manage failures like file write errors, with examples in the err_handler_example showing callback-based notifications.

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