What is the document about the trace of ldc2

[Richard (Rikki) Andrew Cattermole]

The time trace format that ldc outputs comes from Google.

It is used by Chrome's dev tools; Chrome has a built in visualizer for 
the format (now deprecated): chrome://tracing

Perfetto should be preferred instead: https://ui.perfetto.dev/

File format documentation (out of date): 
https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview

You need to use a visualizer to make sense of the data. Such as the 
bundled with ldc tool timetrace2txt.