The Go 1.5 release note says,
The new "go tool trace" command enables the visualisation of program traces generated by new tracing infrastructure in the runtime.
This is really exciting, and I want to know more about it. But its official document at https://golang.org/cmd/trace/ is really dry.
Found that Rob Pike complained about it, requesting that "shortly after the 1.5 release, there should be a blog post about the feature."
If anyone has posted/spotted such a blog, please add a link here. Or, if you like to answer directly here, it is also welcome as well.
Thanks