Hi Andrey, Sorry, I was excited too earlier. In my simple test program, it was working well, but the massive changes of replacing google log by boost log did not go well. That could be due to the complicate real application structure. I have a Log class to wrap the boost log built into a library, the BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT, BOOST_LOG_ATTRIBUTE_KEYWORD and the #define LOG are all defined in Log.hpp, that should be fine, right? The boost log initial function is implemented in the Log class in Log.cpp. The log initial function was called just once in an application base class and remain in the memory until the application exits. First, it got Segmentation fault (core dumped), after changing boost::log::core::get()->add_global_attribute() and boost::log::core::get()->add_thread_attribute() to boost::log::core::get()->add_thread_attribute in the initial function of Log.cpp, it fixed the Segmentation fault, but it did not write anything to the log file in /tmp/log/network.log, the log file is empty. Would you please clarify following questions: (1) Will it be a problem to keep the BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", ::LibraryGlobalServerityLevel_t) and BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT(mGlobalLogger, boost::log::sources::severity_logger_mt<::LibraryGlobalServerityLevel_t>) in a header file Log.hpp where many sources include the header file Log.hpp? (2) I think that the boost log initialization should be called once even in multi threading program to share the same log, is it correct? (3) What are different between add_global_attribute and add_thread_attribute? I thought since I use GLOBAL_LOGGER, I should use the add_global_attribute, why it got Segmentation fault? (4) What could I be missing that the log file is empty? I am writing the log file currently to the /tmp which won't cause any permission issues. I tried both static calling boost::log::add_file_log(..) and shared pointer boost::shared_ptr<FileSink_t> sink(new FileSink_t(...) in the log initial function, it did not make any difference, none of it works. (5) Currently I built it using dynamic link, can it use static link? What will be the build macro for static link?