Add highlighting and colour to the visualisation graph of executors.

[markshannon]

sys.dump_executors() sys._dump_tracelets() dumps out a diagram of the current executors in graphviz format.
It is a bit hard to understand what's going on as it doesn't show cold exits, how well executed the latter parts of traces are, or where it exits to tier1.

With a bit of highlighting and colour, the diagram could be much easier to understand.

I propose adding:

• Edges for jump-to-top
• Markers to show exits that haven't warmed up
• Shading to show parts of traces that are relatively cold
• Warning markers for _DEOPT and other poorly performing uops.

Linked PRs

• gh-143613: Added highlight (in gray color)to visualization graph of executors. #143649
• GH-143613: Add colours and some more edges to executor visualization graph #143809

[hugovk]

sys.dump_executors()

Typo?

[markshannon]

Indeed. It's sys._dump_tracelets(). Our terminology is not very consistent.

[priyanshu2282-cyber]

Hi @markshannon . I just wanted to ask whether you’re planning to work on this issue yourself or if it’s okay for others to take it up. I will coordinate accordingly. Earlier I had raised the PR which is closed now, that added a gray visual highlight to cold executors in the Graphviz output.
Thanks!