Question on Flight Recorder

[Tharaneedharan Vilwanathan]

Hi All,

I have a quick question. I am going through the flight recorder blog post (https://go.dev/blog/flight-recorder) and trying various things. In particular, I am trying "flow events" to see if I can get the connecting lines with arrow marks. No matter what I do, I couldn't get the connecting lines for my code. What causes those lines? New goroutine? Channel communication? Function call? Calling a function in another package? To the extent I checked, it looks like spawning a new go routine produces connecting lines but I am unable to make it happen for my code.

Any clues? Can you please share your thoughts?

Regards

Dharani

[Kevin Chowski]

Just to make sure: you've enabled the flow event lines on the webpage, right? In the post there is a picture of how to do so right after this sentence (at least on mobile):

"Enabling the visualization of all flow events often provides clues that hint at the source of a problem."

If that isn't the problem: have you tried running the self-contained example provided in the post? If you've enabled this visualization for a trace gathered on your own code and it's still not working, try using the code given and visualizing that trace. Surely THAT code should work for producing the arrows, otherwise there's some error in that post.

[Tharaneedharan Vilwanathan]

Hi Kevin,

Sorry for the late reply.

Yes, I did enable the flow event lines. For my program, I did see the event lines for GC related activities.

Earlier, I had tried with my own code copying parts of code to start capture, write, etc. But in my try, I didn't get the event lines for my code.

After seeing your mail, I tried the exact code in the blog. That seems to work (I had to tweak some threshold numbers since duration was much less than 100ms for the requests). I will try to change my code based on what I see and continue my experiment.

Thank you very much.

Regards

Dharani

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[Tharaneedharan Vilwanathan]

Hi Kevin,

Just wanted to let you know that things look good now. I have been modifying my code and checking the event lines each time.

Once again, thank you very much.

Regards

Dharani