How to use fgtrace

Instructions

1. Enable fgtrace

   

2. Forward the new fgtrace port

   

3. Visit the /debug/fgtrace trace path using Insomnia or similar. (It will take about half minute for a trace to complete

   

4. Export the returned JSON

   

5. Open the Perfetto UI

6. Click on “Open trace file” and select the exported JSON

   

7. Wait for it to load

8. You are now seeing a chrome like waterfall graph, showing the wallclock time used by each goroutine

   

9. If you expand a goroutine, you can view what function calls it made

   

10. Due to our sampling frequency, function calls under 0.01 seconds will not be captured

Tip:

You can use the query parameters “seconds” and “hz” to control the trace length and frequency