Dart code does not always appear in traces in devtools about sdk

[a-siva]

@Hixie The CPU profile display on the timeline is turned off by default, would turning that on give you the information you need ?

[a-siva]

//cc @bkonyi @kenzieschmoll

[kenzieschmoll]

@Hixie are there any events in the timeline? A screenshot or a timeline trace you could add here could be helpful. Turning on the CPU samples in the timeline would give you an idea of what is going on on the CPU during your trace. This seems like a similar issue to flutter/devtools#4479, where it is difficult to detect jank between frames because no frames show up as "red" or missing the budget when the jank happens between one frame ending and the next beginning.

[a-siva]

In the weekly triage meeting there was a comment that we have a timeline event called HandleMessage which is not enabled by default for Flutter, enabling this could potentially show more details.

[Hixie]

The test case I was using is the code at the top of flutter/flutter#129894.

I don't really have any details beyond that.

[bkonyi]

Can you try enabling the Isolates timeline stream? This should make the HandleMessages events appear in the timeline.