Boost Logger CPU Usage

[Jack-Byrne]

Bug Report

When comparing the default log4cxx build of SDL Core with the Boost logger configured build, the Boost build of SDL Core uses a lot more CPU during video streaming.

Reproduction Steps

1. Build SDL Core with boost logger
2. Connect HMI and app and start video stream
3. Monitor system resource usage in htop.

Expected Behavior

Boost logger build of SDL Core uses a comparable amount of CPU as the LOG4CXX build.

Observed Behavior

Boost build of SDL Core uses over 100% of system CPU when video streaming.

OS & Version Information

• OS/Version: Ubuntu 16
• SDL Core Version: 7.1.1
• Testing Against: SDL Java Suite

[ShobhitAd]

#3941 improves the CPU usage but is only a partial fix. The CPU usage of the boost build for video streaming logs is still much higher than that of the log4cxx build.

Some other ways to improve CPU usage would be to:

• Use a different approach to process the timestamp. Currently BoostLogger::GetLocalPosixTime is used for every PushLog to convert the timestamp into a format the boost logger can use (boost::posix_time::ptime).
• Find an alternative to the boost add_attribute method. I believe this is main cause of the higher CPU usage. Unfortunately, I wasn't able to find an alternative in the documentation which would work with the boostconfig.ini file