Asynchronous Logging

[ziggyzaddy]

Notes

• Added Asynchronous Logging to IRBTModUtils.Logging.ModLogWriter
• Added two options to mod.json for enabling the feature as well as a (Built-In-Self-Test) for validating operation.
• A statistics class for validating performance has also been added.
• This is estimated to eliminate ~10us per message off the main thread from profiling, and reduce overall CPU consumption ~4x.

Optimizations

• Dispatching messages through an MPMCQueue
• Improve DateTime.ToString times by using fixed formatter and directly writing to output buffer
• Reduce GC allocations and reuse a heap allocated buffer for main message writing.
• Eliminate allocations for concatenations for spaces and newlines through pre-allocated heap buffers sized at 10x the max observed message size with truncation in event of overflow

Omitted

• Encoding and flush optimizations are omitted
• Exception and stacktrace logging use dynamically allocated strings and concats to avoid truncation. Generally not on hot-path.